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Effect of calcination temperature on lattice defects in impure magnesium oxide 煅烧温度对不纯氧化镁晶格缺陷的影响
Ceramurgia International Pub Date : 1979-01-01 DOI: 10.1016/0390-5519(79)90011-5
S.A. Abdel-Hady, N.A. Ahmed, A.R. El-Dib, M.S. Farag
{"title":"Effect of calcination temperature on lattice defects in impure magnesium oxide","authors":"S.A. Abdel-Hady,&nbsp;N.A. Ahmed,&nbsp;A.R. El-Dib,&nbsp;M.S. Farag","doi":"10.1016/0390-5519(79)90011-5","DOIUrl":"https://doi.org/10.1016/0390-5519(79)90011-5","url":null,"abstract":"<div><p>The crystallite size and the strain of powdered MgO prepared by decomposing magnesium carbonate in the range 600–1300°C were measured in [100] and [111] crystallographic directions by analyzing the X-ray line broadening. The Warren and Averbach multiple order method was used. The results showed that the crystallite size and the strain are anisotropic. The lattice parameter was calculated from the centre of gravity of the k<sub>α1</sub> line profile of all planes using Wagner's extrapolation method. The changes in the density of the powdered samples and the changes in the unit cell constant showed that the Schottky defects are probably present at low firing temperatures and there are adsorbed contaminant agents on the primary surfaces of the crystallites. The impurities affected the properties of the polycrystalline material. Their effects were very evident in the magnetic susceptibility values, in the sudden increase of the crystallite size above 1000°C and in the high value of the strain at that temperature.</p></div>","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"5 1","pages":"Pages 45-48"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-5519(79)90011-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91755698","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
Kinetics and mechanism of the solid-state high-temperature transformation of andalusite (Al2SiO5) into 32-mullite (3Al2O3.2SiO2) and silica (SiO2) 红柱石(Al2SiO5)固相高温转化成32-莫来石(3al2o3.2 . SiO2)和二氧化硅(SiO2)的动力学及机理
Ceramurgia International Pub Date : 1979-01-01 DOI: 10.1016/0390-5519(79)90008-5
H. Schneider, A. Majdič
{"title":"Kinetics and mechanism of the solid-state high-temperature transformation of andalusite (Al2SiO5) into 32-mullite (3Al2O3.2SiO2) and silica (SiO2)","authors":"H. Schneider, A. Majdič","doi":"10.1016/0390-5519(79)90008-5","DOIUrl":"https://doi.org/10.1016/0390-5519(79)90008-5","url":null,"abstract":"","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"4 1","pages":"31-36"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84797959","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: 23
Kinetics and mechanism of the solid-state high-temperature transformation of andalusite (Al2SiO5) into 32-mullite (3Al2O3.2SiO2) and silica (SiO2) 红柱石(Al2SiO5)固相高温转化成32-莫来石(3al2o3.2 . SiO2)和二氧化硅(SiO2)的动力学及机理
Ceramurgia International Pub Date : 1979-01-01 DOI: 10.1016/0390-5519(79)90008-5
H Schneider, A Majdič
{"title":"Kinetics and mechanism of the solid-state high-temperature transformation of andalusite (Al2SiO5) into 32-mullite (3Al2O3.2SiO2) and silica (SiO2)","authors":"H Schneider,&nbsp;A Majdič","doi":"10.1016/0390-5519(79)90008-5","DOIUrl":"https://doi.org/10.1016/0390-5519(79)90008-5","url":null,"abstract":"<div><p>The kinetics of the high-temperature transformation of andalusite (&lt;40 μm) were investigated by means of X-ray techniques. The transformation interval was determined to lie between about 1250 and 1500°C. The best fitting of the kinetic data was achieved with an exponential law of the type: 1 − α = exp (−kt + ct/(t + 1)). The kinetic curves are associated with a topotactic transformation mode with preservation of the aluminium-oxygen octahedral chains and diffusion of aluminium, silicon and oxygen atoms. Below 1380°C, mullite (+SiO<sub>2</sub>) formation is essentially restricted to an initial rapid period of the transformation, because nucleation and product growth occur only at energetically favored lattice sites (e.g. grain boundaries). Above 1380°C, mullite and SiO<sub>2</sub> nucleation and growth may take place throughout the volume of the low-temperature phase (andalusite) over the whole range investigated.</p></div>","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"5 1","pages":"Pages 31-36"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-5519(79)90008-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91720104","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: 23
Surface tension and density of molten glasses in the system La2O3Na2Si2O5 La2O3体系中玻璃液的表面张力和密度Na2Si2O5
Ceramurgia International Pub Date : 1979-01-01 DOI: 10.1016/0390-5519(79)90005-X
A. Passerone, R. Sangiorgi, G. Valbusa
{"title":"Surface tension and density of molten glasses in the system La2O3Na2Si2O5","authors":"A. Passerone,&nbsp;R. Sangiorgi,&nbsp;G. Valbusa","doi":"10.1016/0390-5519(79)90005-X","DOIUrl":"10.1016/0390-5519(79)90005-X","url":null,"abstract":"<div><p>Surface tension, density, and volatility of sodium disilicate, modified by additions of 1%, 5%, 10%, mole La<sub>2</sub>O<sub>3</sub>, have been evaluated at temperatures varying from 900 to 1500°C, under highly reducing conditions. These results and related data (such as activation energy of evaporation reaction; thermal expansivity; temperature coefficient of surface tension; nonideal behaviour; surface adsorption) have made possible interpretation of the role played by lanthanum in modifying the properties of the base glass.</p></div>","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"5 1","pages":"Pages 18-22"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-5519(79)90005-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73474086","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
Nuclear division 核分裂
Ceramurgia International Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90039-X
{"title":"Nuclear division","authors":"","doi":"10.1016/0390-5519(78)90039-X","DOIUrl":"https://doi.org/10.1016/0390-5519(78)90039-X","url":null,"abstract":"","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"4 4","pages":"Page 180"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-5519(78)90039-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136716832","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
Materials and equipment division 物料及设备科
Ceramurgia International Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90040-6
{"title":"Materials and equipment division","authors":"","doi":"10.1016/0390-5519(78)90040-6","DOIUrl":"https://doi.org/10.1016/0390-5519(78)90040-6","url":null,"abstract":"","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"4 4","pages":"Page 180"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-5519(78)90040-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136716834","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
Figures-of-merit for the thermal stress resistance of high-temperature brittle materials: a review 高温脆性材料抗热应力性能指标综述
Ceramurgia International Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90028-5
D.P.H. Hasselman
{"title":"Figures-of-merit for the thermal stress resistance of high-temperature brittle materials: a review","authors":"D.P.H. Hasselman","doi":"10.1016/0390-5519(78)90028-5","DOIUrl":"10.1016/0390-5519(78)90028-5","url":null,"abstract":"<div><p>A review is presented of the selection rules for brittle structural ceramics subjected to severe thermal stress. A total of twenty-two figures-of-merit are presented for a total of twenty-nine different heat transfer environments and/or criteria of thermal stress resistance, involving steady-state or transient heat transfer, internal heat generation, thermal buckling as well as thermal fatigue and unstable crack propagation.</p></div>","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"4 4","pages":"Pages 147-150"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-5519(78)90028-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77232125","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: 95
Ceramic-fibre cladding of refractory-brick furnace linings 耐火砖炉衬的陶瓷纤维包覆层
Ceramurgia International Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90056-X
{"title":"Ceramic-fibre cladding of refractory-brick furnace linings","authors":"","doi":"10.1016/0390-5519(78)90056-X","DOIUrl":"https://doi.org/10.1016/0390-5519(78)90056-X","url":null,"abstract":"","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"4 4","pages":"Page 182"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-5519(78)90056-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136501979","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
Liquid fuels from coal pilot plant 中试煤厂生产的液体燃料
Ceramurgia International Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90053-4
{"title":"Liquid fuels from coal pilot plant","authors":"","doi":"10.1016/0390-5519(78)90053-4","DOIUrl":"https://doi.org/10.1016/0390-5519(78)90053-4","url":null,"abstract":"","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"4 4","pages":"Pages 181-182"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-5519(78)90053-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136524569","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
Intergrind '79 Intergrind 79
Ceramurgia International Pub Date : 1978-10-01 DOI: 10.1016/0390-5519(78)90035-2
{"title":"Intergrind '79","authors":"","doi":"10.1016/0390-5519(78)90035-2","DOIUrl":"https://doi.org/10.1016/0390-5519(78)90035-2","url":null,"abstract":"","PeriodicalId":100227,"journal":{"name":"Ceramurgia International","volume":"4 4","pages":"Page 179"},"PeriodicalIF":0.0,"publicationDate":"1978-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-5519(78)90035-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136524570","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
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