Materials Transactions最新文献_第4页

The Research of Corrosion Mechanism of Galvanized Steel in Concrete 镀锌钢在混凝土中的腐蚀机理研究

4区材料科学

Materials Transactions Pub Date : 2023-10-01 DOI: 10.2320/matertrans.mt-c2023007

Yukino Mori, Yoshikatsu Nishida, Hiromasa Shoji

引用次数: 0

Suppressed Hydrogen Peroxide Generation and Enhanced Electrochemical Hydrogen Oxidation Activity for Tungsten-Oxide-Modified Platinum Surface Model Catalyst System 抑制过氧化氢生成和增强氧化钨修饰铂表面模型催化剂体系的电化学氢氧化活性

4区材料科学

Materials Transactions Pub Date : 2023-10-01 DOI: 10.2320/matertrans.mt-mh2022004

Kenta Hayashi, Hikaru Kamikawa, Naoto Todoroki, Toshimasa Wadayama

{"title":"Suppressed Hydrogen Peroxide Generation and Enhanced Electrochemical Hydrogen Oxidation Activity for Tungsten-Oxide-Modified Platinum Surface Model Catalyst System","authors":"Kenta Hayashi, Hikaru Kamikawa, Naoto Todoroki, Toshimasa Wadayama","doi":"10.2320/matertrans.mt-mh2022004","DOIUrl":"https://doi.org/10.2320/matertrans.mt-mh2022004","url":null,"abstract":"Suppressed hydrogen peroxide (H2O2) generation and practical H2 oxidation reaction (HOR) activity of the anode catalyst surface is crucial to improve proton exchange membrane fuel cells (PEMFCs) performance. Here, the influence of surface modification on H2O2 generation and HOR activity by introducing tungsten suboxides (WOx) was investigated for platinum catalyst surfaces. A Pt(111) single-crystal substrate surface was used as the model of Pt-nanoparticle anode catalyst surface and modified with WOx through the reactive arc plasma deposition (APD) of W under an O2 partial pressure (p(O2) = 1 × 10−1 or 10−3 Pa). The oxidation states of WOx were estimated by X-ray photoelectron spectroscopy, and the resulting electrocatalytic properties of H2O2 generation and HOR activity were investigated using a scanning electrochemical microscope. The as-prepared oxidation states of WOx were modified depending on p(O2) during the APD. Contrarily, potential cycle (PC) loadings resulted in a similar oxidation state of WOx: substoichiometric oxides containing W4+ or W5+, irrespective of the as-prepared oxidation states of the deposited tungsten. Regardless of the WOx oxidation state, the WOx/Pt(111) surfaces exhibited suppressed H2O2 generation, even accompanied by enhanced HOR activity compared with the clean Pt(111). Therefore, the WOx surface modification can improve the properties of Pt-based anode catalysts and contribute to high-performance catalyst developments.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323649","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

Development of Ni–Ti–Zr–Hf–(Nb, Ta) Multi-Principal Element High-Temperature Shape Memory Alloys with High Cold Workability 高冷加工性Ni-Ti-Zr-Hf - (Nb, Ta)多主元素高温形状记忆合金的研制

4区材料科学

Materials Transactions Pub Date : 2023-10-01 DOI: 10.2320/matertrans.mt-m2023049

Wataru Tasaki, Yuya Arai, Shuichi Miyazaki, Hee Young Kim

{"title":"Development of Ni–Ti–Zr–Hf–(Nb, Ta) Multi-Principal Element High-Temperature Shape Memory Alloys with High Cold Workability","authors":"Wataru Tasaki, Yuya Arai, Shuichi Miyazaki, Hee Young Kim","doi":"10.2320/matertrans.mt-m2023049","DOIUrl":"https://doi.org/10.2320/matertrans.mt-m2023049","url":null,"abstract":"Novel Ni–Ti–Zr–Hf–Nb and Ni–Ti–Zr–Hf–Ta high temperature shape memory alloys with multi-principal elements were developed, and differences in the effects of Nb and Ta on cold workability and shape memory properties were investigated. Constituent phases, microstructure, cold workability, transformation temperatures, shape memory properties were investigated in (Ni50Ti30Zr10Hf10)100−xNbx (x = 5, 10, 15) alloys and (Ni50Ti30Zr10Hf10)100−yTay (y = 5, 10, 15) alloys. Although both of Nb and Ta were effective to improve cold workability of Ni50Ti30Zr10Hf10 alloy by forming a ductile β phase with a disordered body-centered cubic structure, it was found that Ta was more effective than Nb in improving cold workability. The addition of Ta was also effective to suppress the formation of Ti2Ni-type intermetallic compound. Transformation temperatures were not significantly affected by the addition of Nb, while the transformation temperatures increased by the addition of Ta. According to thermal cycling tests, the (Ni50Ti30Zr10Hf10)85Nb15, (Ni50Ti30Zr10Hf10)90Ta10 and (Ni50Ti30Zr10Hf10)85Ta15 alloys exhibited almost full shape recovery under 200 MPa. These alloys are suggested as promising candidates for practical high temperature shape memory alloys that can be worked at room temperature.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323363","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

Syntheses of Novel Hydrides Containing Light Elements under High Pressure and High Temperature 高压高温下新型含轻元素氢化物的合成

4区材料科学

Materials Transactions Pub Date : 2023-10-01 DOI: 10.2320/matertrans.mt-mh2022007

Hiroyuki Saitoh

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Analysis of Existing States of Co-Deposited Hydrogen in Electrodeposited Pd Films 电沉积Pd膜中共沉积氢的存在状态分析

4区材料科学

Materials Transactions Pub Date : 2023-10-01 DOI: 10.2320/matertrans.mt-m2023076

Tomoya Hashimoto, Tomoya Nakamura, Naoki Fukumuro, Shinji Yae

引用次数: 0

Metal-Support Interaction at Palladium-Composite Manganese Oxide Interface and CO Oxidation Activity 钯-复合氧化锰界面的金属-载体相互作用及CO氧化活性

4区材料科学

Materials Transactions Pub Date : 2023-10-01 DOI: 10.2320/matertrans.mt-mh2022012

Toyokazu Tanabe, Kazuma Aso, Shugoro Tsutsumi, Seiya Shimono, Saburo Hosokawa

引用次数: 0

Suggestion of a New Repair Technique for Steel Structures by Low-Pressure Cold Spray and Laser Cleaning 低压冷喷涂和激光清洗对钢结构修复新技术的建议

4区材料科学

Materials Transactions Pub Date : 2023-10-01 DOI: 10.2320/matertrans.mt-t2023001

Tomonori Hatori, Hiroki Saito, Yuji Ichikawa, Kazuhiro Ogawa, Yuichi Kato, Kosaku Motomura, Michito Nakano, Norimichi Yamashita

{"title":"Suggestion of a New Repair Technique for Steel Structures by Low-Pressure Cold Spray and Laser Cleaning","authors":"Tomonori Hatori, Hiroki Saito, Yuji Ichikawa, Kazuhiro Ogawa, Yuichi Kato, Kosaku Motomura, Michito Nakano, Norimichi Yamashita","doi":"10.2320/matertrans.mt-t2023001","DOIUrl":"https://doi.org/10.2320/matertrans.mt-t2023001","url":null,"abstract":"The effectiveness of a corrosion repair technique consisting of laser cleaning and cold spraying was investigated. The effect of laser pulse frequency on the removal of surface corrosion on steel specimens was analyzed. Subsequently, a zinc coating was cold-sprayed on specimens cleaned of surface corrosion using conventional disc grinder and laser methods. Furthermore, salt spray tests were conducted to compare the corrosion protection performance of the zinc coating on these specimens. The results showed that laser cleaning can effectively remove surface corrosion and that a laser pulse frequency of 15 kHz is more effective than that of 40 kHz for removing the surface oxide layer. A comparison of cold-sprayed zinc coatings on laser-cleaned and non-treated specimens indicated that surface oxidation during laser treatment may negatively affect zinc deposition efficiency. The zinc coating on the laser-cleaned specimen was more than twice as thick as that on the conventionally cleaned specimen, and the coating–specimen interface maintained good adhesion after a 168 h salt spray test. Although no corrosion was observed in both steel specimens after the salt spray test, cracking of the remaining corroded areas on the substrate and delamination of the coating occurred in the conventionally cleaned specimen.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323631","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: 1

Synthesis and Microwave Absorption Properties of Novel Bi1/2(Na0.8K0.2)1/2TiO3/Fe3O4 Composite 新型Bi1/2(Na0.8K0.2) TiO< 1/2TiO< 3O4;复合

4区材料科学

Materials Transactions Pub Date : 2023-10-01 DOI: 10.2320/matertrans.mt-mg2022026

Nguyen Dang Co, Bui Dai Phat, Phan Van Khai, Tran Quang Dat, Ho Thi Anh, Nguyen Tran Ha, Le Viet Cuong, Nguyen Huy Tiep, Nguyen Thi Minh Hong, Dang Duc Dung, Ngo Duc Quan, Tran Mau Danh, Phan The Long, Pham Duc Thang, Bui Dinh Tu

{"title":"Synthesis and Microwave Absorption Properties of Novel Bi1/2(Na0.8K0.2)1/2TiO3/Fe3O4 Composite","authors":"Nguyen Dang Co, Bui Dai Phat, Phan Van Khai, Tran Quang Dat, Ho Thi Anh, Nguyen Tran Ha, Le Viet Cuong, Nguyen Huy Tiep, Nguyen Thi Minh Hong, Dang Duc Dung, Ngo Duc Quan, Tran Mau Danh, Phan The Long, Pham Duc Thang, Bui Dinh Tu","doi":"10.2320/matertrans.mt-mg2022026","DOIUrl":"https://doi.org/10.2320/matertrans.mt-mg2022026","url":null,"abstract":"The combination of two dielectric-magnetic components in the same composite has been shown to significantly improve the effectiveness of electromagnetic (EM) shielding and microwave absorption (MWA) because they have both a combination of high dielectric and magnetic losses and good impedance matching. The novel Bi1/2(Na0.8K0.2)1/2TiO3/Fe3O4 (BNKT/Fe3O4) composite has been successfully synthesized by a two-step method with wide effective absorption bandwidth (EAB = 16 GHz) in the high-frequency (2–18 GHz). It was evident that the MWA efficiency of the BNKT/Fe3O4 composite has been significantly improved compared with pure Bi1/2(Na0.8K0.2)1/2TiO3 or Fe3O4 materials. In addition, the BNKT/Fe3O4 composite could achieve reflection loss (RL = −39.41 dB, ∼99.99% at 10.16 GHz) with a sample thickness optimal (d = 4.7 mm). This work shows that the novel BNKT/Fe3O4 composite has excellent MWA properties, all contributing to a potential candidate in the electromagnetic wave absorption and shielding fields.","PeriodicalId":18402,"journal":{"name":"Materials Transactions","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135323647","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 Combined Use of Brazing or Soldering around the Nugget on Tensile Shear Strength of Resistance Spot Welded Lap Joint 熔核周围钎焊或焊接复合使用对电阻点焊搭接抗拉剪切强度的影响

4区材料科学

Materials Transactions Pub Date : 2023-10-01 DOI: 10.2320/matertrans.mt-m2023096

Takanori Kitamura, Tetsuya Akiyama, Atsuro Uemura, Chinatsu Mihara

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Thermoelectric Conversion Efficiency of 4% in Environmental-Friendly Kesterite Single Crystal 环境友好型Kesterite单晶热电转换效率达4%

4区材料科学

Materials Transactions Pub Date : 2023-10-01 DOI: 10.2320/matertrans.mt-e2023002

Akira Nagaoka, Katsuma Nagatomo, Koki Nakashima, Yuichi Hirai, Yasuyuki Ota, Kenji Yoshino, Kensuke Nishioka

引用次数: 0