Materiali in tehnologije最新文献_第6页

DRY SLIDING WEAR BEHAVIOUR OF AZ31/ZrO2 COMPOSITES PRODUCED USING A STIR CASTING PROCESS 搅拌铸造AZ31/ZrO2复合材料的干滑动磨损性能

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2023-05-31 DOI: 10.17222/mit.2022.543

K. K. Basha, R. Subramanian, T. Satish Kumar, G. Suganya Priyadharshini

引用次数: 1

BIO-PRINTING OF FEMUR MODEL: A BONE SUBSTITUTE FOR BIOMEDICAL RESEARCH 生物打印股骨模型:生物医学研究的骨替代品

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2023-05-31 DOI: 10.17222/mit.2023.831

A. Vasanthanathan, Senthil Maharaj Ramesh Kennedy

引用次数: 2

FAILURE ANALYSIS OF CARBIDE TWIST-DRILL BIT FOR SMALL-SCALE GRANITE DRILLING 小型花岗岩钻头用硬质合金麻花钻头失效分析

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2023-05-30 DOI: 10.17222/mit.2023.702

Saurabh Dewangan, J. Burja

引用次数: 0

STUDY OF DROPLET TRANSFER CHARACTERISTICS AND WELD FORMATION WITH ER430LNb FERRITIC STAINLESS STEEL DURING GAS METAL ARC WELDING ER430LNb铁素体不锈钢气体保护焊熔滴传递特性及焊缝成形研究

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2023-05-30 DOI: 10.17222/mit.2022.697

Fengde Liu, Yu Gu, Fan Xu, H. Zhang, Shaowei Xu, Zhihang Yan, Zhifeng Yan, Wen-xian Wang

引用次数: 0

EXPERIMENTAL STUDY ON THE FACTORS AFFECTING THE INSULATION PERFORMANCE OF FLAME-RETARDANT MULTILAYER INSULATION MATERIALS 阻燃多层保温材料保温性能影响因素的实验研究

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2023-05-30 DOI: 10.17222/mit.2023.736

Xiaoyong Ma, Shuping Chen, L. Chen, Yujie Wang, Shufeng Jin, Yang Yu, Maoyuan Mi, Chaofan Shi, Yagang Shi

{"title":"EXPERIMENTAL STUDY ON THE FACTORS AFFECTING THE INSULATION PERFORMANCE OF FLAME-RETARDANT MULTILAYER INSULATION MATERIALS","authors":"Xiaoyong Ma, Shuping Chen, L. Chen, Yujie Wang, Shufeng Jin, Yang Yu, Maoyuan Mi, Chaofan Shi, Yagang Shi","doi":"10.17222/mit.2023.736","DOIUrl":"https://doi.org/10.17222/mit.2023.736","url":null,"abstract":"Flame-retardant multilayer insulation materials act as effective thermal insulation blankets of cryogenic containers that store flammable and explosive cryogenic liquids. This study used standard static liquid nitrogen boil-off calorimetry to test the insulation performance of eight groups of flame-retardant multilayer insulation materials with different wrapping parameters. The effects of four factors, namely the layer density, seaming process, number of reflector layer, and variable-density multilayer insulation arrangement, on the insulation performance were analysed. Three layer densities were considered: 4.47, 3.08, and 2.50 layers/mm. Two types of seaming processes were discussed: the overlapped and fold-over seaming processes. Three numbers of reflector layers were considered: 60, 70, and 80. Two variable-density multilayer insulation arrangements with similar thicknesses were discussed: 10-10-40 and 20-20-20 layers of reflectors allocated for low-, medium- and high-density segments. The conclusions are as follows: Decreasing the layer density enhances the performance of multilayer insulation; Using the fold-over seaming process results in less heat flux and lower apparent thermal conductivity; An increase in the number of reflector layers weakens radiative heat transfer, resulting in better thermal insulation; Furthermore, for a given wrapping thickness, reducing the number of reflectors appropriately in low- and medium-density segments improves the insulation performance; Optimizing and controlling the layer density of each density segment are also essential for variable-density multilayer insulation effects. This study provides supporting theories and reference data for practical engineering applications.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"42 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87555259","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

EVOLUTION OF MICROSTRUCTURE AND EMBRITTLEMENT DURING THE TEMPERING PROCESS IN SiCrCu MEDIUM-CARBON STEELS SiCrCu中碳钢回火过程中组织和脆化的演变

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2023-05-30 DOI: 10.17222/mit.2023.744

P. Salvetr, A. Gokhman, Č. Donik, Z. Nový, Jabub Kotous, M. Godec

引用次数: 1

EFFECT OF ALKALINE SOLUTION CONCENTRATION ON THE PASSIVATION FILM OF Cu-Ni ALLOY 碱性溶液浓度对铜镍合金钝化膜的影响

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2023-05-30 DOI: 10.17222/mit.2023.782

Yue Li, Shuyan Zhao, Xinyu Zhang, Shuo Zhang, Xiaoliang Wu, N. Wu

引用次数: 0

PREPARATION AND STUDY OF A PU-MODIFIED EPOXY RESIN COLD PATCHING MIXTURE pu改性环氧树脂冷补料的制备与研究

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2023-03-30 DOI: 10.17222/mit.2023.748

Xiaofeng Huang, Junhui Luo, Pengfei Tang, Cheng Xie, J. Chen

{"title":"PREPARATION AND STUDY OF A PU-MODIFIED EPOXY RESIN COLD PATCHING MIXTURE","authors":"Xiaofeng Huang, Junhui Luo, Pengfei Tang, Cheng Xie, J. Chen","doi":"10.17222/mit.2023.748","DOIUrl":"https://doi.org/10.17222/mit.2023.748","url":null,"abstract":"Focusing on the problems of low strength and insufficient water stability of the cold patch mixture for asphalt pavement, a polyether polyurethane prepolymer with high activity was prepared in this experiment, and then the epoxy resin was modified with the prepolymer to prepare a kind of epoxy-resin-mixture pothole-repair material with high strength and high toughness. The content of polyurethane prepolymer was optimized using a low-temperature tensile test and a normal-environment-condition mechanical test, and the mechanical properties and road performance of the PU-modified epoxy-resin mixture were studied with a rutting test, bending test, Cantabro scattering and a splitting test. The results show that PU prepolymer-modified epoxy resin can effectively increase the toughness and strength of the binder, and that the toughness and mechanical properties of 20 phr PU prepolymer are the best. The road performance of the PU-modified epoxy-resin cold patch mixture is excellent. There is little difference between the immersion scattering loss rate and the standard loss rate, and both are less than 4 %, indicating that the mixture has excellent anti-scattering and water-loss performance. It is very suitable as a cold patch material for pavement pits. Due to its comprehensive road performance and reasonable price, the use of the PU-modified epoxy resin binder content of 4 % is recommended.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"21 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85963731","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

CHARACTERISATION OF THE MICROSTRUCTURE AND DEFECTS DURING THE DIRECT ENERGY DEPOSITION OF HYBRID Ti6Al4V IN A LOW-QUALITY ATMOSPHERE 低质量气氛下直接能量沉积杂化Ti6Al4V的微观结构及缺陷表征

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2023-03-30 DOI: 10.17222/mit.2023.837

S. Malej, Č. Donik, M. Balažic, Matija Bizjak, M. Kac, M. Godec

{"title":"CHARACTERISATION OF THE MICROSTRUCTURE AND DEFECTS DURING THE DIRECT ENERGY DEPOSITION OF HYBRID Ti6Al4V IN A LOW-QUALITY ATMOSPHERE","authors":"S. Malej, Č. Donik, M. Balažic, Matija Bizjak, M. Kac, M. Godec","doi":"10.17222/mit.2023.837","DOIUrl":"https://doi.org/10.17222/mit.2023.837","url":null,"abstract":"Additive manufacturing is a complicated process, including powder preparation and post-processing. The atmosphere during the processing of sensitive alloys like Ti6Al4V is among the most important factors. The N content influences the mechanical properties in a significant way. Therefore, it is essential to understand, recognise, and identify the problems in case of machine malfunction or human error. The influence of a low-quality atmosphere on the microstructure evolution and mechanical properties was investigated during the direct energy deposition of hybrid additive-manufactured Ti6Al4V. The properties of the built parts were characterised by chemical analyses, light and electron microscopy, and mechanical testing. High concentrations of N, which absorbed and dissolved with every deposition layer of the direct-energy-deposition process, promoted the formation of a layer of α-scale on the part’s surface. The presence of α-scale was confirmed by observing the sample surfaces and the lack of fusion pores where a layer of α-scale remained. The α-scale partially or entirely dissolved during the next deposition layer. The morphology of the partially melted, α-scale depended on the size of the deposition and, thus, on the temperature evolution during the direct energy deposition.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":"54 4 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80936332","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

CORRELATION BETWEEN ELECTRICAL AND OPTICAL PROPERTIES OF DOPED SILICON NANOCRYSTALS 掺杂硅纳米晶体的电学和光学性质的相关性

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2023-03-30 DOI: 10.17222/mit.2022.720

引用次数: 0