Journal of the Ceramic Association, Japan最新文献_第2页

Features and Relationship between Some Methods of X-ray Diffraction Analysis for Amorphous Materials 非晶材料x射线衍射分析方法的特点及相互关系

Journal of the Ceramic Association, Japan Pub Date : 1986-01-01 DOI: 10.2109/JCERSJ1950.94.1092_842

H. Hasegawa, I. Yasui

{"title":"Features and Relationship between Some Methods of X-ray Diffraction Analysis for Amorphous Materials","authors":"H. Hasegawa, I. Yasui","doi":"10.2109/JCERSJ1950.94.1092_842","DOIUrl":"https://doi.org/10.2109/JCERSJ1950.94.1092_842","url":null,"abstract":"Two fundamental methods have been used for X-ray structure analysis of amorphous materials, i.e., the intensity comparison method and radial distribution analysis. There is an opinion that Fourier conversion from raw intensity data to a radial distribution function (RDF) introduces some errors and a comparison on intensity curves is, therefore, more exact. The present calculations have indicated that an RDF obtained from an intensity curve can be exactly re-transformed to the original intensity curve, if the upper range of Fourier-integral is sufficiently high. This means that no information disappears or any other spurious information is not added in the process of transformation between intensity data and an RDF. On the other hand, direct calculation of intensity with the Debye equation inevitably introduces truncation errors, unless some approximations are used. When the comparison on intensity curves is requested, it is desirable to transform an RDF obtained from a structure model to an intensity curve. Some distortions introduced in RDFs are offset each other in an observed and calculated RDFs and usually need not to be considered in the pair function method. There is, however, another opinion that some distortions introduced in RDFs difuse the part of small atomic distances and a comparison in intensity curves is, therefore, necessary. The present calculations indicate that atomic pairs with small inter-atomic distances can be equally compared in RDFs as well as in intensity curves as for oxide, chalcogenide or halide glasses. In conclusion, the present calculations have proved that errors are not intermixed in transformation process between an intensity curve and an RDF and that the same level of assessment of the structural models is possible either in intensity curves or in RDFs, although the intensity comparison method by use of the Debye equation can not avoid the intermixture of truncation errors, unless some approximations are used.","PeriodicalId":17274,"journal":{"name":"Journal of the Ceramic Association, Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77968075","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

Sintering Temperature Dependence on Impurities in SiC Ceramics 烧结温度对SiC陶瓷中杂质的影响

Journal of the Ceramic Association, Japan Pub Date : 1986-01-01 DOI: 10.2109/JCERSJ1950.94.1086_306

K. Usami, S. Uehara, A. Soeta, K. Maeda

{"title":"Sintering Temperature Dependence on Impurities in SiC Ceramics","authors":"K. Usami, S. Uehara, A. Soeta, K. Maeda","doi":"10.2109/JCERSJ1950.94.1086_306","DOIUrl":"https://doi.org/10.2109/JCERSJ1950.94.1086_306","url":null,"abstract":"1. 緒言酸化ベリリウム (BeO) を焼結助剤としたSiC焼結体は, 高い熱伝導性と高い電気絶縁性を兼ね備えている. この特異な性質の発現は, 高いち密性とSiC粒内の電気的活性な不純物量が極めて少ない (〓1017cm-3) ことが主要因であることが知られている1)~4). 一方原料に用いているSiC粉には, Ti, Fe, Niなど金属不純物が0.1 ~0 .01wt%含まれているが5), 電気的には不活性であるということから, その挙動については無視されてきた. しかしこれら不純物の量は電気的に活性な不純物量に比べ1~2けたも多く, 焼結体の特性をより精密に制御するためには, これら不純物の特性への影響を詳細に調べておく必要がある. 本報告はその第1段階として, 上記不純物の焼結途中での挙動を明らかにすることを目的に, 各種の温度で焼結体を作製し残存量の焼結温度依存性を調べるとともに, 分析電子顕微鏡によりその存在状態を調べたものである.","PeriodicalId":17274,"journal":{"name":"Journal of the Ceramic Association, Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90620361","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

Fracture Toughness of Graphite Materials 石墨材料的断裂韧性

Journal of the Ceramic Association, Japan Pub Date : 1986-01-01 DOI: 10.2109/JCERSJ1950.94.163

M. Sakai, Y. Goto, M. Inagaki

{"title":"Fracture Toughness of Graphite Materials","authors":"M. Sakai, Y. Goto, M. Inagaki","doi":"10.2109/JCERSJ1950.94.163","DOIUrl":"https://doi.org/10.2109/JCERSJ1950.94.163","url":null,"abstract":"形状及び初期き裂長さの異なるストレートスルーノッチを持つ高密度等方性黒鉛試片について破壊靱性値の持つ意味を弾塑性破壊の立場に立つエネルギー論解析との対応から議論した. き裂を準静的に進展させる過程で除荷-負荷を繰り返し, 荷重-荷重点変位曲線 (P-u曲線) から破壊エネルギー γWOFを測定するとともに, それを弾性エネルギー解放率 γeと塑性散逸エネルギー γpとに分離・評価した. また, 線形破壊力学に準じた破壊靱性値[KIC]Yを求め, 破壊エネルギーから計算した値[KIC]γと比較した. 黒鉛材は, 大きな破壊エネルギー (約75J/m2) と大きな塑性変形を持ち, 全破壊エネルギー中に占める塑性散逸エネルギーの割合は40%に達する. 靱性値[KIC]Yは[KIC]γ とほぼ等しく, 大きな塑性変形をともなう黒鉛材特有の破壊挙動が[KIC]Y値にも強く反映している. き裂進展にともなう[KIC]Yの変化は, き裂長さa/Wが0.7~0.8付近からその増加に伴って急激な減少を示し, き裂進展に対する自由表面の強い影響と, き裂先端に大きなプロセスゾーンが存在することが示唆された. (1985年7月29日受付)","PeriodicalId":17274,"journal":{"name":"Journal of the Ceramic Association, Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87176564","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

Sintering of Si3N4-SiC Whisker Composite Si3N4-SiC晶须复合材料的烧结

Journal of the Ceramic Association, Japan Pub Date : 1986-01-01 DOI: 10.2109/JCERSJ1950.94.1095_1177

N. Tamari, I. Kondo, S. Sodeoka, K. Ueno, Y. Toibana

引用次数: 1

Development of Light-Weight Aggregate Production Process from Coal Ash with a Shaft Kiln (Part 3) 立窑粉煤灰生产轻骨料工艺的发展(三)

Journal of the Ceramic Association, Japan Pub Date : 1986-01-01 DOI: 10.2109/JCERSJ1950.94.1094_1068

M. Kawamura, T. Ohtake, K. Uchida, K. Kamiya, F. Ikazaki

{"title":"Development of Light-Weight Aggregate Production Process from Coal Ash with a Shaft Kiln (Part 3)","authors":"M. Kawamura, T. Ohtake, K. Uchida, K. Kamiya, F. Ikazaki","doi":"10.2109/JCERSJ1950.94.1094_1068","DOIUrl":"https://doi.org/10.2109/JCERSJ1950.94.1094_1068","url":null,"abstract":"One t/d test plant facilities of the shaft kiln for calcination of coal ash pellets is designed and constructed. Experimental studies are carried out with this test plant to examine the relationship between reactor behavior and product properties and to clarify the technical problems of the shaft kiln necessary to attain the stable operation. It is found that the most important factor is smooth movement of the pellets supllied from the top of the kiln. Steady and smooth discharge of the pellets could be achieved by applying a forced discharger like a ram feeder. The maximum temperature level of the moving bed in the shaft kiln is governed by not only operational conditions but green pellet composition such as carbon and moisture content. The position of the maximum temperature is affected by an air flow rate as well as discharge rate. The calcined pellets are tested according to JIS A 5002 (Light-weight concrete for structure) and Anouncement No. 13 of Environmental Agency (Industrial Waste Disposal Regulation) and tested properties satisfy the specification and regulation values. Especially, the compressive concrete strength shows 550kgf/cm2 which is about 40% stronger than that of JIS value. Conceptual design of a 50t/d pilot plant and cost estimation of the developed process are performed based on the studies conducted up to now. In case of a 1000t/d plant, production cost is estimated under 3000yen/m3.","PeriodicalId":17274,"journal":{"name":"Journal of the Ceramic Association, Japan","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1986-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80463312","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

Determination of Refractoriness of Amakusa Pottery Stone by Thermal Expansion Curves 热膨胀曲线法测定天草陶石耐火度

Journal of the Ceramic Association, Japan Pub Date : 1986-01-01 DOI: 10.2109/JCERSJ1950.94.1091_689

K. Kimura, H. Tateyama, O. Ishibashi, K. Jinnai

引用次数: 0

ラマン分光法によるCaO-Ga2O3-B2O3系ガラスの研究拉曼光谱法对ao - ga2o3 - b2o3系玻璃的研究

Journal of the Ceramic Association, Japan Pub Date : 1985-11-01 DOI: 10.2109/JCERSJ1950.93.1083_708

修建趙, 二郎福永, 吉田直次郎, 将昌井原

引用次数: 4

CuO-V2O5-TeO2系ガラス及び結晶化ガラスの電気伝導 CuO-V2O5-TeO2类玻璃和结晶玻璃的导电

Journal of the Ceramic Association, Japan Pub Date : 1985-05-01 DOI: 10.2109/JCERSJ1950.93.1077_244

哲郎吉田, 碩平島, 宗則加藤

引用次数: 17

Wear of Si3N4 ceramics measured with various testers. 用各种测试仪测量了Si3N4陶瓷的磨损。

Journal of the Ceramic Association, Japan Pub Date : 1985-01-01 DOI: 10.2109/JCERSJ1950.93.1074_73

M. Iwasa, Y. Toibana, Shigeru Yoshimura, Eiichiro Kobayashi

引用次数: 1

Dependency of Mechanical Property of Sintered Mullite on Chemical Composition 烧结莫来石力学性能与化学成分的关系

Journal of the Ceramic Association, Japan Pub Date : 1985-01-01 DOI: 10.2109/JCERSJ1950.93.1079_407

S. Kanzaki, T. Kumazawa, J. Asaumi, O. Abe, H. Tabata

引用次数: 18