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Characteristics of plasma-sprayed coatings using fine Al2O3 powder 细Al2O3粉末等离子喷涂涂层的特性
Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1303
B. Kim, D. Suhr
{"title":"Characteristics of plasma-sprayed coatings using fine Al2O3 powder","authors":"B. Kim, D. Suhr","doi":"10.2320/MATERTRANS1989.41.1303","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1303","url":null,"abstract":"The objective of this study was to investigate the characteristics of fine-Al 2 O 3 coating after plasma spraying using fine-Al 2 O 3 powder which has the particle size distribution of 1-12 μm and the mean particle size of 4.12 μm. The microstructure of the coating was very dense and the width of each splat of the fine alumina powder was approximately 10 μm. The average thickness of splats was approximately 1.4 μm, and this value was approximately 1/3 of mean particle size. The surface roughness of the coating was Ra = 5.2 μm and this result was approximately 30% lower than the surface roughness of other plasma-sprayed Al 2 O 3 coatings. The main phase of the coating was γ-Al 2 O 3 and also a little of α-Al 2 O 3 phase was observed. The fraction of α-Al 2 O 3 in the coating was 8.39%. Micro-hardness ranged from 1030 to 890 depending on the indentation load and differed little from commercial Al 2 O 3 coating but the hardness variation was relatively large. Nonetheless, it is expected that the fine-Al 2 O 3 coating will be used as coating materials because it does not require post-surface finishing after spraying.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"123 1","pages":"1303-1306"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73753363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Cyclic Deformation and Development of Dislocation Structures in a Centrifugally Cast Al–Al3Ti of Functionally Graded Material 离心铸造Al-Al3Ti功能梯度材料中位错结构的循环变形和发展
Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1322
K. Yamashita, C. Watanabe, S. Kumai, M. Kato, A. Sato, Yoshimi Watanabe
{"title":"Cyclic Deformation and Development of Dislocation Structures in a Centrifugally Cast Al–Al3Ti of Functionally Graded Material","authors":"K. Yamashita, C. Watanabe, S. Kumai, M. Kato, A. Sato, Yoshimi Watanabe","doi":"10.2320/MATERTRANS1989.41.1322","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1322","url":null,"abstract":"An Al-Al 3 Ti composite has been prepared to contain a large volume fraction of D02 2O ordered Al 3 Ti phase on one side and a smaller volume fraction on the other side by a functional grading process. The cyclic stress-strain curves obtained by strain control tests are compared with the available data on Al to delineate the effects of the Al 3 Ti plates distributed with concentration gradient. Examination of the crack nucleation and growth by a replica method has revealed that introduction of the non-deformable Al 3 Ti accelerates crack nucleation but concurrently hinders the spontaneous propagation in the cyclic tests. Observation of the final structure by HVEM has further revealed that presence of the non-deformable Al 3 Ti induces non-uniform distribution of dislocations near the Al 3 Ti plate, causing build-up of stress inhomogeneity, especially on the Al 3 Ti rich side. On the basis of these observations, utility of the FGM specimens is discussed with a particular interest in the lifetime prediction under cyclic loading.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"7 1","pages":"1322-1328"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82759227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Mechanical Properties of Cr–Ni–N Films Deposited on Pre-Nitrided Steels 预氮化钢上沉积Cr-Ni-N薄膜的力学性能
Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1366
N. Yasumaru, Hiroyuki Magara, T. Ibe
{"title":"Mechanical Properties of Cr–Ni–N Films Deposited on Pre-Nitrided Steels","authors":"N. Yasumaru, Hiroyuki Magara, T. Ibe","doi":"10.2320/MATERTRANS1989.41.1366","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1366","url":null,"abstract":"Austenitic type 304 stainless steel was ion-nitrided and subsequently ion-plated with Cr-Ni-N whose Ni content was varied from 0 at% to 50at%. The ceramic film of CrN coated onto the pre-nitrided steel demonstrated good wear resistance even under a heavy load. Furthermore, a 10 μm thick CrN film exhibited the least wear among the 3 to 19 μm thick CrN films. The Cr-Ni-N films containing Ni were composed of mixed phases of Cr*N and Ni. Cr*N is a newly observed Cr nitride that may contain some Ni and has been identified as an f.c.t. structure. A Cr-Ni-N film with Ni content of 11 at% coated onto the pre-nitrided steel demonstrated the best wear resistance among the CrN film or Cr-Ni-N films with high Ni content. This superior wear resistance was maintained even at film thicknesses exceeding 20 μm, unlike the tendency of CrN film.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"22 2 1","pages":"1366-1370"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86761610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Positron Spectroscopy of Boron Carbide Containing Metal Impurity 含金属杂质碳化硼的正电子光谱
Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1293
Chan Liu
{"title":"Positron Spectroscopy of Boron Carbide Containing Metal Impurity","authors":"Chan Liu","doi":"10.2320/MATERTRANS1989.41.1293","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1293","url":null,"abstract":"Boron carbide (B 4.3 C) semiconductors with metal incorporation were prepared by hot pressing mixtures of boron carbide powder (B 4.3 C) and 0.5 ∼ 1 at% metal (Zr or V). The influences of impurity incorporation on the subtle structure and conductivity of B 4.3 C crystals were investigated. Positron lifetime spectrum, x-ray diffraction and Doppler-broadening analyses indicate that appropriate metal introduction can modify the B 4.3 C structure. Especially, noticeable vacancies are introduced into about the B(3) sites at the chain centers. Meanwhile, the B 4.3 C lattice cell contracts a little along the c axis. No distinctive change of the electrical conductivity is found to accompany the structural change.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"707 1","pages":"1293-1296"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76899189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Ionic Transport Number of CaS–Na2S Solid Electrolytes CaS-Na2S固体电解质的离子输运数
Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1351
Youichirou Ogawa, A. Kasahara, S. Iwasaki, Hiroaki Nakamura
{"title":"Ionic Transport Number of CaS–Na2S Solid Electrolytes","authors":"Youichirou Ogawa, A. Kasahara, S. Iwasaki, Hiroaki Nakamura","doi":"10.2320/MATERTRANS1989.41.1351","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1351","url":null,"abstract":"To obtain highly ionic conductor of sulfides, a solid solution of 95CaS-5Na 2 S was prepared by sintering the powder mixture of CaS and Na 2 S which has the NaCl type structure and the anti-fluorite structure, respectively. Two concentration cells using the solid solution as solid electolyte were constructed as follows. Fe, FeS|95CaS-5Na 2 S|Mn, MnS Ag, Ag 2 S|95CaS-5Na 2 S|Cu, Cu 2 S The reversibility of the measured e.m.f. was confirmed. The electromotive forces of the concentration cells were measured over the temperature range 670 to 1120K. Because the measured values for the concentration cells were close to theoretical values calculated using the Nemst equation, it is concluded that the ionic transference number of the solid solution, 95CaS-5Na 2 S, is close to one.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"14 1","pages":"1351-1355"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89706270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermogravimetric-Mass Spectrometric Analysis of the Reactions between Oxide (ZnO, Fe 2 O 3 or ZnFe 2 O 4 ) and Polyvinyl Chloride under Inert Atmosphere 惰性气氛下氧化锌、fe2o3或znfe2o4与聚氯乙烯反应的热重质谱分析
Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1342
B.-P. Zhang, Xiao-Yong Yan, K. Shibata, T. Uda, M. Tada, M. Hirasawa
{"title":"Thermogravimetric-Mass Spectrometric Analysis of the Reactions between Oxide (ZnO, Fe 2 O 3 or ZnFe 2 O 4 ) and Polyvinyl Chloride under Inert Atmosphere","authors":"B.-P. Zhang, Xiao-Yong Yan, K. Shibata, T. Uda, M. Tada, M. Hirasawa","doi":"10.2320/MATERTRANS1989.41.1342","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1342","url":null,"abstract":"The mechanisms of reactions are investigated between polyvinyl chloride and oxides such as ZnO, Fe 2 O 3 and ZnFe 2 O 4 under inert gas atmosphere at high temperature with combined thermogravimetry-mass spectrometry (TG-MS) technique. From the experiments under a constant heating rate of 40 K/min, the following results are obtained. In the case of mixture pellet of ZnO and PVC, the chlorination of Zn in ZnO to ZnCl 2 by Cl in PVC starts at a relatively low temperature about 473 K without the formation of HCl. The chlorination is followed by the de-hydrochlorination of residual un-reacted PVC, also by the further degradation to lower order hydrocarbons, and finally by the evaporation of ZnCl 2 at higher temperature. On the other hand, in the case of ZnO-PVC double layer pellet in which ZnO layer is compacted at the top of PVC layer, PVC decomposition accompanying HCl formation starts at about 523 K, which is similar to the thermal decomposition of pure PVC in the absence of the oxide. The chlorination of Zn is not favored in this case of double layer sample. In the case of Fe 2 O 3 -PVC mixture, the de-hydrochlorination takes place at the temperature range of 513 to 673 K, similarly with the case of the pure PVC decomposition. With increasing temperature, the degradation of de-hydrochlorinated PVC residue to lower hydrocarbons and the stepwise reduction from Fe 2 O 3 to metallic Fe takes, place after the de-hydrochlorination. The reaction scheme of ZnFe 2 O 4 -PVC system shows intermediate character between ZnO-PVC system and Fe 2 O 3 -PVC system. The kinetic mechanisms of the reaction between the oxides and PVC are examined on the basis of the experimental results.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"22 1","pages":"1342-1350"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82683262","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 56
Growth of primary a phase in the semi-solid state Mg-Zn-Ca-Zr alloy 半固态Mg-Zn-Ca-Zr合金中初生a相的生长
Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1337
S. Chang, D. Shin, Atsushi Fukatsu, H. Tezuka, A. Kamio
{"title":"Growth of primary a phase in the semi-solid state Mg-Zn-Ca-Zr alloy","authors":"S. Chang, D. Shin, Atsushi Fukatsu, H. Tezuka, A. Kamio","doi":"10.2320/MATERTRANS1989.41.1337","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1337","url":null,"abstract":"The coarsening of the primary a phase in a Mg-6.0%Zn-2.0%Ca-1.5%Zr alloy in the semi-solid state temperature range was investigated to establish the necessary processing conditions for the semi solid state forming processes. The growth of the primary α phase was found to be influenced by the sample heating and holding duration. In addition, the growth rate was observed to be rather high for a lower holding temperature. These phenomena were discussed based on the experimentally measured distance between the grains in the semi-solid state.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"37 1","pages":"1337-1341"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80638656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Quantification of volume fraction of precipitates in an aged Al-1.0 mass%Mg2Si alloy 时效Al-1.0质量%Mg2Si合金中析出相体积分数的定量分析
Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1275
Katsuya Matsumoto, S. Komatsu, M. Ikeda, B. Verlinden, P. Ratchev
{"title":"Quantification of volume fraction of precipitates in an aged Al-1.0 mass%Mg2Si alloy","authors":"Katsuya Matsumoto, S. Komatsu, M. Ikeda, B. Verlinden, P. Ratchev","doi":"10.2320/MATERTRANS1989.41.1275","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1275","url":null,"abstract":"An Al-1.0 mass%Mg 2 Si alloy was aged at 473 K for 36ks. Using the same sample, resistivity (p) measurements, tensile tests and TEM observations were carried out. The volume fraction (V fρ ) of precipitates was estimated from the decrement in resistivity due to aging. Length (λ), diameter (d) and number density (Np) per unit volume of the needle-shaped precipitates were measured on TEM micrographs. Perhaps because of initiation of overaging in the present aging condition, λ and Np showed a wide scatter and differed significantly in two equivalent samples, independently heat treated and tested. However, proof stress and V fρ in the two runs well coincided with each other and the volume fraction estimated from TEM micrographs (V fTEM ) matched within a factor of 2 for the two runs.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"14 1","pages":"1275-1281"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83859799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 27
Influence of Sn Content on the Corrosion Behavior of Pb–Ca–Sn Alloys in High-Temperature Sulfuric Acid Solution Sn含量对Pb-Ca-Sn合金在高温硫酸溶液中腐蚀行为的影响
Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1307
Masarni Taguchi, T. Hirasawa
{"title":"Influence of Sn Content on the Corrosion Behavior of Pb–Ca–Sn Alloys in High-Temperature Sulfuric Acid Solution","authors":"Masarni Taguchi, T. Hirasawa","doi":"10.2320/MATERTRANS1989.41.1307","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1307","url":null,"abstract":"Pb-0.08 mass%Ca-Sn alloys with a wide range of Sn contents were prepared, and then immersed in 4.50kmol m -3 H 2 SO 4 at 348 K to elucidate the influence of Sn content on their corrosion behavior. Under natural immersion, the corrosion current of the Pb-Ca-Sn alloys is governed by the cathodic reaction, which involves the consumption of dissolved oxygen. The anodic reaction consists mostly of PbSO 4 formation and Sn dissolution. For the Pb-Ca-Sn alloys with 0 ∼ 0.2 mass%Sn, 99% of the anodic current is used in the former reaction. The formation of the sulfate, which is noticeably fragile and low in strength, can be assumed to be one cause for the serious corrosion damage to the low-Sn alloy grids in high-temperature sulfuric acid solution. On the other hand, the current for the PbSO 4 formation decreases linearly with increasing Sn content in the alloys at about 0.3 mass% Sn or more. For the high-Sn alloys such as Pb-0.08 mass%Ca-1.2 mass%Sn, the ratio of PbSO 4 formation to the anodic current is lowered by the Sn content, and the mechanical strength may be maintained at a high level to prevent serious corrosion.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"1 1","pages":"1307-1311"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90988652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Influence of Activated Dislocations on Recrystallization near Grain Boundaries in Coarse-Grained Fe–30Cr Alloy 激活位错对粗晶Fe-30Cr合金晶界附近再结晶的影响
Materials Transactions Jim Pub Date : 2000-10-20 DOI: 10.2320/MATERTRANS1989.41.1360
Wen-Yue Liu, T. Okada, F. Inoko
{"title":"Influence of Activated Dislocations on Recrystallization near Grain Boundaries in Coarse-Grained Fe–30Cr Alloy","authors":"Wen-Yue Liu, T. Okada, F. Inoko","doi":"10.2320/MATERTRANS1989.41.1360","DOIUrl":"https://doi.org/10.2320/MATERTRANS1989.41.1360","url":null,"abstract":"Compressive deformation was applied to a coarse-grained Fe-30Cr alloy polycrystal at room temperature. Multiple slip occurred close to a grain boundary. Through the investigation of the activated slip systems, it was known that the dislocations which piled up against the grain boundary were mixed ones with a relatively large screw component. After annealing, many recrystallized grains (RGs) formed close to the original grain boundary. The orientations of more than 80% of the RGs were related to the deformed matrices by rotations about (110) axes normal to each common cross slip plane of the activated dislocations. Strain induced boundary migration did not occur. The preferred orientation of RGs was discussed in connection with the activity of slip systems.","PeriodicalId":18264,"journal":{"name":"Materials Transactions Jim","volume":"94 1","pages":"1360-1365"},"PeriodicalIF":0.0,"publicationDate":"2000-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80664786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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