International Journal of Applied Ceramic Technology最新文献_第4页

UV curing of polysilazane-based coatings with metallic fillers for corrosion protection applications 含金属填料的聚硅氮烷基防腐涂料的紫外光固化

IF 2.3 4区材料科学

International Journal of Applied Ceramic Technology Pub Date : 2025-07-26 DOI: 10.1111/ijac.70034

Jan-Felix Wendel, Annika Fischer, Daniel Leykam, Stefan Schafföner, Günter Motz

{"title":"UV curing of polysilazane-based coatings with metallic fillers for corrosion protection applications","authors":"Jan-Felix Wendel, Annika Fischer, Daniel Leykam, Stefan Schafföner, Günter Motz","doi":"10.1111/ijac.70034","DOIUrl":"https://doi.org/10.1111/ijac.70034","url":null,"abstract":"In this study, UV curing of polysilazane-based coating systems highly filled with metallic fillers for corrosion protection applications was examined. The UV curing was carried out using the thiol-ene “click” reaction. Therefore, a tetra-functional thiol crosslinking agent and a photoinitiator were added to the polysilazane to accomplish the radical crosslinking reaction. The UV-cured coating systems were compared to thermally cured samples regarding mechanical properties and chemical resistance. The mechanical properties were studied by scratch tests and hardness measurements and the chemical resistance by immersion in toluene and isopropanol. Contact angle measurements were carried out before and after the chemical resistance tests. Surprisingly, it was found that despite the high amount of metallic particles, the entire filled coating was cured by UV irradiation. The mechanical properties of the UV-cured systems were slightly worse compared to the thermally cured coatings. However, both curing methods led to a very good chemical resistivity of the coatings against the liquid polar and nonpolar media. Contact angle measurements revealed that by UV curing more hydrophobic coatings are achieved due to prevention of oxidation of the metallic fillers. Hence, UV curing is a suitable technique to crosslink also filled coatings offering interesting properties for corrosion protection applications.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1111/ijac.70034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Yb3+–Ce4+ content on mechanical, thermophysical, and CMAS resistance properties of La2−xYbxZr2−xCexO7 ceramics Yb3+ -Ce4 +含量对La2−xYbxZr2−xCexO7陶瓷力学、热物理和抗CMAS性能的影响

IF 2.3 4区材料科学

International Journal of Applied Ceramic Technology Pub Date : 2025-07-25 DOI: 10.1111/ijac.70024

Zheng Chen, Pengsen Zhao, Haizhong Zheng, Guifa Li, Yongxiang Geng, Yixin Xiao, Hongbo Guo, Jian He

{"title":"Effect of Yb3+–Ce4+ content on mechanical, thermophysical, and CMAS resistance properties of La2−xYbxZr2−xCexO7 ceramics","authors":"Zheng Chen, Pengsen Zhao, Haizhong Zheng, Guifa Li, Yongxiang Geng, Yixin Xiao, Hongbo Guo, Jian He","doi":"10.1111/ijac.70024","DOIUrl":"https://doi.org/10.1111/ijac.70024","url":null,"abstract":"Mechanical, thermophysical, and CMAS resistance properties of La2−xYbxZr2−xCexO7 (x = 0.00, 0.25, 0.50, 0.75, 1.00) ceramics were studied. La2−xYbxZr2−xCexO7 (x ≠ 0.0) has higher Vickers hardness (HV) and fracture toughness (KIC) than La2Zr2O7. When the Yb3+–Ce4+ concentration of La2−xYbxZr2−xCexO7 grows, its thermal conductivity drops, thermal expansion coefficient increases, and CMAS corrosion resistance improves. LaYbZrCeO7 has the smallest thermal conductivity (1200°C, 1.285 W/(m K)), the largest thermal expansion coefficient (1200°C, 10.554 × 10−6/K), and the best CMAS corrosion resistance (1300°C, 30 min, the reaction layer thickness is merely ∼5.1 µm). Its HV and KIC values were 10.10 GPa and 2.14 MPa m1/2, respectively, much higher than those of La2Zr2O7 (8.20 GPa, 1.77 MPa m1/2). Thus, LaYbZrCeO7 shows good comprehensive performance.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of alumina-chrome slag with different Na2O content on the slag corrosion resistance of corundum spinel castables 不同Na2O含量的铝铬渣对刚玉尖晶石浇注料抗渣腐蚀性能的影响

IF 2.3 4区材料科学

International Journal of Applied Ceramic Technology Pub Date : 2025-07-24 DOI: 10.1111/ijac.70028

Qilong Chen, Tianqing Li, Cheng Liu, Jie Gao, Baikuan Liu, Qixiu Zuo, Qian Zhang, Guotao Liu, Hailing Yuan

{"title":"Effect of alumina-chrome slag with different Na2O content on the slag corrosion resistance of corundum spinel castables","authors":"Qilong Chen, Tianqing Li, Cheng Liu, Jie Gao, Baikuan Liu, Qixiu Zuo, Qian Zhang, Guotao Liu, Hailing Yuan","doi":"10.1111/ijac.70028","DOIUrl":"https://doi.org/10.1111/ijac.70028","url":null,"abstract":"Alumina-chrome (AC) slag from aluminothermic reduction has potential applications in corundum-spinel castables and can significantly lower costs. However, the stability of using AC slag remains unclear due to the fluctuating impurities such as sodium oxide. The purpose of this work is to evaluate the feasibility of using two types of AC slag with different Na₂O impurity contents in traditional corundum-spinel castables. The results indicated that the slag corrosion resistance of corundum-spinel castables is extremely sensitive to the Na2O impurities in AC slag. AC slag with a low Na₂O content (0.29 wt%) can potentially replace tabular alumina aggregates without significantly compromising the slag corrosion resistance of the castables. Nevertheless, the slag corrosion resistance of the castables is deteriorated sharply as the Na2O content in AC slag reaches 1.39 wt%. The dissolution of sodium oxide impurities from alumina chrome waste residual into the slag not only increases the liquid phase amount of the slag, but also decreases its viscosity at high temperatures. These changes can make the slag more aggressive towards the castables, thereby promoting the slag penetration and limiting the formation of protective layer at the interface.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of WC addition on the mechanical properties and oxidation resistance of ZrB2/SiC-based UHTCMCs WC加入对ZrB2/ sic基uhtcmc力学性能和抗氧化性能的影响

IF 2.3 4区材料科学

International Journal of Applied Ceramic Technology Pub Date : 2025-07-23 DOI: 10.1111/ijac.70031

Antonio Vinci, Matteo Mor, Luca Zoli, Diletta Sciti

{"title":"Effect of WC addition on the mechanical properties and oxidation resistance of ZrB2/SiC-based UHTCMCs","authors":"Antonio Vinci, Matteo Mor, Luca Zoli, Diletta Sciti","doi":"10.1111/ijac.70031","DOIUrl":"https://doi.org/10.1111/ijac.70031","url":null,"abstract":"The sintering behavior, mechanical properties, and oxidation resistance of carbon fiber reinforced ZrB2/SiC/WC composites were investigated. Sintering was carried out between 1800 and 2000°C via hot pressing at 40 MPa. WC was completely consumed in the process, and the resulting microstructure was characterized by the formation of Zr1−xWxC solid solutions and WB at the ZrB2 border grains. The sample sintered at 1800°C was characterized by high porosity, whereas the sample sintered at 2000°C was fully dense, but fibers were severely degraded. A temperature of 1900°C allowed to obtain 92% relative density while preserving the fibers integrity, which was reflected in the higher mechanical properties. Comparing these results with a reference ZrB2/SiC composite, the addition of WC did not seem to significantly affect the mechanical properties, but it promoted the formation of a more compact oxide scale during oxidation, resulting in the higher protection of the material at 1650°C in air.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1111/ijac.70031","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Cr2AlC additive on the properties and corrosion resistance of Cr2O3-Al2O3 refractories Cr2AlC添加剂对Cr2O3-Al2O3耐火材料性能及耐蚀性的影响

IF 2.3 4区材料科学

International Journal of Applied Ceramic Technology Pub Date : 2025-07-23 DOI: 10.1111/ijac.70021

Mengjie Deng, Zheng Miao, Tao Zhang, Zihao Wu, Wen Yan, Nan Li, Junfeng Chen

{"title":"Influence of Cr2AlC additive on the properties and corrosion resistance of Cr2O3-Al2O3 refractories","authors":"Mengjie Deng, Zheng Miao, Tao Zhang, Zihao Wu, Wen Yan, Nan Li, Junfeng Chen","doi":"10.1111/ijac.70021","DOIUrl":"https://doi.org/10.1111/ijac.70021","url":null,"abstract":"Cr2O3-containing refractories are widely applied to the harsh service environments, such as coal water slurry gasifiers and various nonferrous metallurgical processes. The Cr2O3-Al2O3 solid solution in the high chrome brick, as the main bonding system, has an adverse effect on the high-temperature properties of the Cr2O3-containing refractories of the final production. In this work, the incorporation of Cr2AlC into the conventional Cr2O3-Al2O3 as additive was carried out, and the effect of Cr2AlC on the high-temperature properties and corrosion resistance was investigated. The results indicated that the residual strength ratio still maintained stability when the content of Cr2AlC added was 5%. While the corrosion resistance index of the sample with 5wt% Cr2AlC-adding increased approximately 50% compared with the regular Cr2O3-Al2O3 refractories. In addition, the degradation mechanism of the Cr2O3-Al2O3 refractories after the addition of Cr2AlC in contact with slag was studied, and the role of Cr2AlC was elucidated.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strain rate effects on the anisotropic behavior of unidirectional CVI SiC f ${rm SiC}_{mathrm{f}}$ /PyC/SiC composites 应变速率对单向CVI SiC f ${rm SiC}_{ mathm {f}}$ /PyC/SiC复合材料各向异性行为的影响

IF 2.3 4区材料科学

International Journal of Applied Ceramic Technology Pub Date : 2025-07-23 DOI: 10.1111/ijac.70030

Dong Han, Guangwu Fang, Haoxiang Wang, Jinling Gao, Jiagui Liu, Tao Wu, Xiguang Gao, Yingdong Song

{"title":"Strain rate effects on the anisotropic behavior of unidirectional CVI \u0000 \u0000 \u0000 SiC\u0000 f\u0000 \u0000 ${rm SiC}_{mathrm{f}}$\u0000 /PyC/SiC composites","authors":"Dong Han, Guangwu Fang, Haoxiang Wang, Jinling Gao, Jiagui Liu, Tao Wu, Xiguang Gao, Yingdong Song","doi":"10.1111/ijac.70030","DOIUrl":"https://doi.org/10.1111/ijac.70030","url":null,"abstract":"In this paper, we examined the dynamic behaviors of unidirectional (UD) <math>\u0000 <semantics>\u0000 <msub>\u0000 <mi>SiC</mi>\u0000 <mi>f</mi>\u0000 </msub>\u0000 <annotation>${rm SiC}_{mathrm{f}}$</annotation>\u0000 </semantics></math>/PyC/SiC composites, fabricated via chemical vapor infiltration (CVI), under various loading conditions. These conditions included tension, compression, and shear, applied in both the longitudinal and transverse directions of the composites. To achieve the desired failure patterns, we designed specific specimens and clamping methods. The tests were conducted using a hydraulic servo testing machine and Kolsky tension and compression bar systems to achieve different loading rates. Post-test specimens' typical microstructural characteristics, such as matrix cracks, fiber breakages, and fracture angles, were observed using optical and scanning electron microscopy (SEM). By combining these characteristics with the mechanical responses, we investigated the damage mechanisms and effects of strain rate. Finally, based on the experimental results, we discussed precautions for ceramic matrix composites (CMCs) during manufacturing and service processes.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145197022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermocyclic protection performance of Si-Zr(Hf)B2-SiC coatings for oxidative and ablative environments up to 2300°C Si-Zr(Hf)B2-SiC涂层在2300℃氧化和烧蚀环境下的热循环保护性能

IF 2.3 4区材料科学

International Journal of Applied Ceramic Technology Pub Date : 2025-07-22 DOI: 10.1111/ijac.70026

Xiaoyang Guo, Yuan Tian, Yan Jiang, Na Wang

{"title":"Thermocyclic protection performance of Si-Zr(Hf)B2-SiC coatings for oxidative and ablative environments up to 2300°C","authors":"Xiaoyang Guo, Yuan Tian, Yan Jiang, Na Wang","doi":"10.1111/ijac.70026","DOIUrl":"https://doi.org/10.1111/ijac.70026","url":null,"abstract":"Ceramic coatings exhibiting superior thermocyclic oxidation and ablation resistance under broad thermal regimes are imperative for ensuring the durability of carbonaceous substrates in high-temperature oxidative and ablative environments. Herein, Si-Zr(Hf)B2-SiC coatings were prepared on graphite surfaces by silicon vaporization reaction, the coatings have dense structure, with uniform distributions of Zr(Hf)B2 and SiC grains in continuous silicon. After 100 h of oxidation (5 h × 20) at 1600°C, the coating with ZrB2/HfB2 molar ratio of 4:6 (Z4H6) exhibited better cyclic oxidation resistance (mass gain of 0.80%). A multicomponent Zr-Hf-Si-O protection layer that mainly consisted of ZrO2/HfO2, Zr(Hf)SiO4, SiO2 played an effective role in blocking oxygen, thus protecting graphite substrate from oxygen invasion. After 600 s of cyclic ablation (120 s × 5) at 2300°C, the mass and line ablation rates were 5.57 × 102 mg/s and 0.52 µm/s, respectively. During ablation, the Zr-Hf oxides formed on the surface effectively resisted flame erosion, while the SiO2 with fluidity repaired the defects in the oxide layer, thereby reducing the coating consumption under plasma flame. Eventually, the volatilization and decomposition of ablative products, in combination with mechanical scouring caused by plasma flame, progressively degrade the Z4H6 coating, ultimately resulting in the protection failure.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145196989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of B4C particle size on TiB2 synthesis via microwave-assisted boro/carbothermal reduction B4C粒径对微波辅助boro/碳热还原合成TiB2的影响

IF 2.3 4区材料科学

International Journal of Applied Ceramic Technology Pub Date : 2025-07-22 DOI: 10.1111/ijac.70000

Xin Li, Jian Tang, Chen Xu, Jia Qiao, Zhaolei Zhang

{"title":"Effect of B4C particle size on TiB2 synthesis via microwave-assisted boro/carbothermal reduction","authors":"Xin Li, Jian Tang, Chen Xu, Jia Qiao, Zhaolei Zhang","doi":"10.1111/ijac.70000","DOIUrl":"https://doi.org/10.1111/ijac.70000","url":null,"abstract":"Understanding the reaction behavior of B4C feedstocks with varying particle sizes is crucial for the synthesis of fine high-purity TiB2 via microwave-assisted boro/carbothermal reduction in the TiO2‒B4C‒C system. The influence of three particle sizes of B4C, that is, 15.8, 2.8, and 0.6 µm on the microstructure, particle size, and purity of synthesized TiB2 was investigated. It was found that the morphology and size of TiB2 product synthesized with coarse (15.8 µm) and medium (2.8 µm) B4C were independent of the feedstock size. Whereas the resultant TiB2 size (0.56 µm) closely matched the initial fine B4C size (0.6 µm). The reduction of B4C particle size significantly enhanced TiB2 purity, lowering residual C and O impurities from 0.42% and 1.24% (with 15.8 µm B4C) to 0.23% and 0.48% (with 0.6 µm B4C), respectively. Furthermore, thermodynamic analysis and differential scanning calorimetry revealed distinct reaction pathways: coarse B4C resulted in incomplete contact between TiO2 and B4C raw materials led to the formation of TiBO3 and Ti2O3 intermediates, whereas fine B4C facilitated direct TiB2 formation without intermediates. Based on the thermodynamic evaluation and experimental results, the reaction mechanism for synthesis of TiB2 from coarse- and fine-grained B4C was also systematically explored and established, respectively.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145196992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fast crack propagation prediction in SiCf/SiC via deep learning with phase-field-generated data 基于相场生成数据的深度学习SiCf/SiC快速裂纹扩展预测

IF 2.3 4区材料科学

International Journal of Applied Ceramic Technology Pub Date : 2025-07-22 DOI: 10.1111/ijac.70020

Jin Gao, Guangyu Ma, Xiaodong He, Haolong Fan, Guangping Song, Xiaocan Zou, Yongting Zheng, Huixing Zhang, Yuelei Bai

{"title":"Fast crack propagation prediction in SiCf/SiC via deep learning with phase-field-generated data","authors":"Jin Gao, Guangyu Ma, Xiaodong He, Haolong Fan, Guangping Song, Xiaocan Zou, Yongting Zheng, Huixing Zhang, Yuelei Bai","doi":"10.1111/ijac.70020","DOIUrl":"https://doi.org/10.1111/ijac.70020","url":null,"abstract":"The high-accuracy numerical analysis for the crack propagation in solids with multiple initial pores by physics-based models can be greatly computational costing. A conditional generative adversarial network (cGAN)-based framework that is trained on the dataset generated by phase field method (PFM) is proposed for the crack propagation in silicon carbide fiber-reinforced silicon carbide matrix composites. The structural similarity calculations show that the cGAN achieves a high prediction accuracy by designing its object function and discriminator. By fixing the discriminator's receptive field to optimize the cGAN, the optimal discriminator's receptive field is 16 × 16, with their respective accuracy at 98%. Moreover, the trained cGAN is capable of simulating crack propagation with a wide range of geometric size, pore configurations, and pore shape, without any additional modification. Interestingly with a speed up by 28‒75 times in comparison to PFM, the computational time for the cGAN remains consistent at 10‒13 s, irrespective of the geometric size and node degrees of freedom. These characteristics make the cGAN framework a promising approach for quickly simulating the crack propagation.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145196990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Slip casting porous silicon nitride for high-temperature radar frequency radomes 高温雷达频率天线罩用滑移铸造多孔氮化硅

IF 2.3 4区材料科学

International Journal of Applied Ceramic Technology Pub Date : 2025-07-21 DOI: 10.1111/ijac.70016

Averyonna R Kimery, Matthew A Thompson, Carlos J Martinez, Rodney W Trice

{"title":"Slip casting porous silicon nitride for high-temperature radar frequency radomes","authors":"Averyonna R Kimery, Matthew A Thompson, Carlos J Martinez, Rodney W Trice","doi":"10.1111/ijac.70016","DOIUrl":"https://doi.org/10.1111/ijac.70016","url":null,"abstract":"Silicon nitride (Si3N4) is a promising candidate for ceramic radar frequency (RF) radomes. In this study, suspensions have been developed to slip cast Si3N4 for RF windows utilizing 6 wt.% yttrium oxide (Y2O3)-2 wt.% aluminum oxide (Al2O3) and 5–15 wt.% ytterbium oxide sintering aids. Suspensions were evaluated via rheology, zeta potential, and casting rate to determine the optimal ball milling time, concentration of polyethylenimine dispersant, and suspension pH for a low viscosity, high stability slip. Choice of sintering aids tailored porosity from 7% to 38% in slip-cast Si3N4 components after sintering at 1850°C, where the Y2O3–Al2O3 system had higher relative density compared with the Yb2O3 systems. Extending this work, layered structures of alternating Si3N4 compositions and hollow, curved Si3N4 radome shapes were also fabricated through slip casting. The layered structures had a graded microstructure and smooth interfaces between Si3N4 regions. The radomes were able to be cast and sintered crack-free. Overall, slip casting was demonstrated as a processing pathway to produce porous Si3N4 components desirable for RF and high-temperature applications.","PeriodicalId":13903,"journal":{"name":"International Journal of Applied Ceramic Technology","volume":"22 6","pages":""},"PeriodicalIF":2.3,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ceramics.onlinelibrary.wiley.com/doi/epdf/10.1111/ijac.70016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145196981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0