Materials Science Research International最新文献

Mechanical and Thermal Properties of Biopolyester-Lignophenol Films 生物聚酯-木酚膜的力学和热性能

Materials Science Research International Pub Date : 2004-04-15 DOI: 10.2472/JSMS.53.4APPENDIX_78

Eriko Ohmae, M. Funaoka, S. Fujita

引用次数: 2

Production of Crystallized Carbon for Electromagnetic Shielding from Lignocresol by Nickel-Catalyzed Carbonization : Influence of Calcium Co-loading (I) 木质素甲酚镍催化炭化制备电磁屏蔽用结晶碳:钙共载的影响(一)

Materials Science Research International Pub Date : 2004-03-15 DOI: 10.2472/JSMS.53.3APPENDIX_48

Xiao-Shui Wang, Tsutomu Suzuki, M. Funaoka

引用次数: 2

Domain Structures and Rheological Properties of Immiscible Polymer Blends under Shear Flow in Parallel Plates 平行板剪切流动下非混相聚合物共混物的畴结构和流变性能

Materials Science Research International Pub Date : 2003-12-15 DOI: 10.2472/JSMS.52.12APPENDIX_278

Yoshiaki Takahashi, Naoto Imura, Kyoko Miyanishi, S. Kitade, I. Noda

引用次数: 2

Fatigue Strength of Ti-6Al-4V Alloys Containing Small Artificial Defects 含人工小缺陷Ti-6Al-4V合金的疲劳强度

Materials Science Research International Pub Date : 2003-12-15 DOI: 10.2472/JSMS.52.12APPENDIX_263

H. Matsunaga, Y. Murakami, M. Kubota, Joon-Hyun Lee

{"title":"Fatigue Strength of Ti-6Al-4V Alloys Containing Small Artificial Defects","authors":"H. Matsunaga, Y. Murakami, M. Kubota, Joon-Hyun Lee","doi":"10.2472/JSMS.52.12APPENDIX_263","DOIUrl":"https://doi.org/10.2472/JSMS.52.12APPENDIX_263","url":null,"abstract":"The effects of small defects on the fatigue strength of Ti-6Al-4V were investigated in tension-compression fatigue tests. To simulate the defects, holes having 50, 200, 400, 760 and 1000μm diameters were introduced onto the surface of a series of specimens (Series A). Another series of specimens (Series B) were prepared to investigate the effect of a burr or a pre-crack which was introduced at the edge of the artificial hole. For Series A specimens, the fatigue limit was defined as the threshold for crack initiation from the edge of the hole. For Series B specimens, the fatigue limit was defined as the threshold for crack propagation from the burr or the tip of the pre-crack. The results of the fatigue tests for R=-1 indicated that the fatigue limits of Series B specimens were 20∼60MPa lower than those of Series A specimens. In contrast to steels, non-propagating cracks did not form at the holes, a fact associated with the relatively high stress level for crack initiation from hole in Ti-6Al-4V. It was also found that the area parameter model underestimated the fatigue limit of Series A specimens, but the model accurately predicted the fatigue limit defined by crack-growth threshold for Series B specimens. In addition it was noted that the presence of a burr resulted in a decrease in fatigue life, since the burr facilitated the crack initiation process.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116691207","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: 17

Hydroxyapatite Coatings on Ti Plate via Chemical Bath Deposition 化学浴沉积在钛板上的羟基磷灰石涂层

Materials Science Research International Pub Date : 2003-06-15 DOI: 10.2472/JSMS.52.6APPENDIX_149

Y. Jia, Y. Kanno

{"title":"Hydroxyapatite Coatings on Ti Plate via Chemical Bath Deposition","authors":"Y. Jia, Y. Kanno","doi":"10.2472/JSMS.52.6APPENDIX_149","DOIUrl":"https://doi.org/10.2472/JSMS.52.6APPENDIX_149","url":null,"abstract":"In recent years, the use of bioactive calcium phosphate coatings for biological fixation of load-bearing implants has been attracting much attention. Many techniques have been used to produce calcium phosphate, especially hydroxyapatite (HAP) coatings on metallic substrates. In this paper, a simple wet-chemical method, chemical bath deposition is reported to prepare calcium hydroxyapatite coatings on a Ti plate at relatively low temperature (93°C). The method is based on chelating calcium ions with a complex reagent and then increasing the temperature to dissociate the calcium ions, which induces the precipitation of HAP. EDTA is chosen as the complexion agent. At 60-95°C the Ca(EDTA) 2- complex thermally dissociates and releases free calcium ions. Substrates used in this research are Ti plates with 0.2 mm in thickness. The substrates were gritted by metallographic Al 2 O 3 paper and then treated in a solution of 2mol/dm 3 KOH at 95°C for 1 hour. The HAP coatings were performed in a chemical bath that was heated from 60°C to 95°C, XRD data indicated that the coatings are highly crystalline. FTIR and EDX analyses revealed that the coatings consist of Ca-deficient apatite. SEM micrographs of the coatings show that the coating is composed of evenly small crystal grains. The surface was uniform without apparent pores or agglomerates.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124156315","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: 1

Micro-structure of bentonite clay and diffusion coefficient given by multiscale homogenization analysis 膨润土粘土的微观结构及多尺度均匀化分析所得的扩散系数

Materials Science Research International Pub Date : 2003-06-15 DOI: 10.2472/JSMS.52.6APPENDIX_117

N. Fujii, Y. Ichikawa, K. Kawamura, Satoru Suzuki, K. Kitayama

引用次数: 6

Mechanism of corrosion resistance degradation of Cr-plated parts due to heat treatment and its prevention 镀铬件热处理耐腐蚀退化机理及预防

Materials Science Research International Pub Date : 2003-03-15 DOI: 10.2472/JSMS.52.3APPENDIX_94

Yuichi Kobayashi, J. Nagasawa, T. Sasaki, Y. Hirose

{"title":"Mechanism of corrosion resistance degradation of Cr-plated parts due to heat treatment and its prevention","authors":"Yuichi Kobayashi, J. Nagasawa, T. Sasaki, Y. Hirose","doi":"10.2472/JSMS.52.3APPENDIX_94","DOIUrl":"https://doi.org/10.2472/JSMS.52.3APPENDIX_94","url":null,"abstract":"The mechanism of decrease in the corrosion resistance of Cr-plated parts when they are subjected to a heating process and measures for preventing the degradation are studied. When postfinishing is performed after the Cr-plating process, cracks in the Cr layer are closed as a result of plastic flow on the topmost surface layer. When the residual stress in the Cr layer becomes compressive due to the postfinishing, the cracks are completely closed, resulting in a high corrosion resistance. The residual stress in the Cr layer changes from compressive to tensile following heat treatment. When the residual stress becomes tensile, the cracks in the Cr layer which were closed during postfinishing open once again, resulting in a decrease in the corrosion resistance. We speculated that the change of residual stress from compressive to tensile is caused by the shrinkage of the Cr layer due to heat treatment and the difference in the coefficients of thermal expansion between the substrate (steel) and Cr layer, as well as the release of residual stress generated during processing. In order to prevent the decrease of corrosion resistance under heat treatment, it is effective to apply compressive stress which exceeds the level of change in residual stress due to heat treatment to the Cr layer during postfinishing, after the Cr plating process.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"51 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131433773","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

Design and Function of Lignin-Based Recyclable Composites 木质素基可回收复合材料的设计与性能

Materials Science Research International Pub Date : 2003-03-15 DOI: 10.2472/JSMS.52.3APPENDIX_108

Y. Nagamatsu, M. Funaoka

{"title":"Design and Function of Lignin-Based Recyclable Composites","authors":"Y. Nagamatsu, M. Funaoka","doi":"10.2472/JSMS.52.3APPENDIX_108","DOIUrl":"https://doi.org/10.2472/JSMS.52.3APPENDIX_108","url":null,"abstract":"Through the phase-separation system composed of phenols and concentrated acid, the phenol components are selectively hybridized into C1-positions of phenylpropane units of native lignin to give 1, 1-bis(aryl)propane-type linear polymers (lignophenols) quantitatively. Lignophenols have unique properties such as high phenolic activity and obvious phase transition. Furthermore, the functionality of lignophenols was able to be controlled using the intramolecular switching function: Under alkaline condition, C1-phenols in lignophenols nucleophilically attack adjacent C2 as switching devices, followed by the cleavage of aryl ether linkages. In ligno-p-cresol and ligno-2, 4-dimethylphenol with similar switching functionality and structural characteristics, ligno-p-cresol was highly hydroxymethylated (HM) on the cresolic nucleus to give network-living pre-polymer. On the other hand, ligno-2, 4-dimethylphenol having reactive sites mainly on the terminal unit gave linear-living pre-polymers. The structures of polymerized lignophenols were controlled by mixing ratio of HM-ligno-p-cresol and HM-ligno-2, 4-dimethylphenol or by the hybridization ratio of p-cresol and 2, 4-dimethylphenol in lignophenols followed by hydoxymethylation. The resulting polymer chains were cleaved at the switching points to give low molecular weight subunits by the switching function. Recyclable composites were prepared by the combination of cellulose and HM-lignophenol (the mixing ratio of HM-ligno-p-cresol to HM-ligno-2, 4-dimethylphenol was 1:0, 1:1, 0:1, respectively). The composites had glossy surfaces and looked like wood. The dimensional stability of composites was improved significantly with increasing mixing ratio of HM-ligno-p-cresol to HM-ligno-2, 4-dimethylphenol. Using the switching functionality of lignophenol, the composites were re-separated into lignophenols with low molecular weight and cellulose.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128265218","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: 4

Creep-fatigue crack growth behavior of low alloy steel under displacement-controlled conditions 位移控制条件下低合金钢蠕变疲劳裂纹扩展行为

Materials Science Research International Pub Date : 2003-03-15 DOI: 10.2472/JSMS.52.3APPENDIX_34

H. Kino, T. Igari, T. Tokiyoshi, F. Kawashima, Fujita Masaaki, T. Teramae, Shin Yoshino

引用次数: 2

Electrochemical evaluation of damage level to weight bearing surface of metal head joint prosthesis 金属头关节假体承重面损伤程度的电化学评价

Materials Science Research International Pub Date : 2003-03-15 DOI: 10.2472/JSMS.52.3APPENDIX_87

M. Morita, Eiko Kondo, Tomohisa Yamada, T. Sasada

{"title":"Electrochemical evaluation of damage level to weight bearing surface of metal head joint prosthesis","authors":"M. Morita, Eiko Kondo, Tomohisa Yamada, T. Sasada","doi":"10.2472/JSMS.52.3APPENDIX_87","DOIUrl":"https://doi.org/10.2472/JSMS.52.3APPENDIX_87","url":null,"abstract":"Pin on disk friction tests were carried out for three types of metals, 316L S.Steel, Co-28Cr-6Mo, and Ti-6Al-4V alloys in PBS(-) to estimate the range of loads that can be applied to the bearing surface of a joint prosthesis, based on the degree of damage to the passivation film. The results were as follows: (1) When two metals of the same type were rubbed against each other, the passivation film was almost completely destroyed immediately after the onset of friction, even when a very low normal load was applied. (2) In the metal to UHMWPE friction test, the passivation film was severely damaged immediately after the onset of friction. However, the passivation film recovered until the polarization potential reached a certain level, which was specific to each metal. (3) The allowable load on the bearing head was calculated, assuming that the degree of damage to the passivation film was 20% or 40%. When a metal acetabulum socket was used, damage to the passivation film on the head was severe, regardless of the type of metal used for both the acetabulum socket and the head. When a UHMWPE acetabulum socket was used, the allowable load ranged from 8.16x10 2 N to 1.31x10 5 N for 316L S.Steel, from 7.83x10 3 N to 1.31x10 5 N for Co-28Cr-6Mo alloy, and from 43N to 6.08x10 2 N for Ti-6Al-4 Valloy.","PeriodicalId":377759,"journal":{"name":"Materials Science Research International","volume":"158 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132671069","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: 1