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Effect of preparation method on sinterability and properties of nanocrystalline MgAl2O4 and ZrO2-MgAl2O4 materials 制备方法对纳米晶MgAl2O4和ZrO2-MgAl2O4材料烧结性能的影响
British Ceramic Transactions Pub Date : 2003-06-01 DOI: 10.1179/096797803225001632
I. Ganesh, B. Srinivas, Roy Johnson, G. Rao, Y. Mahajan
{"title":"Effect of preparation method on sinterability and properties of nanocrystalline MgAl2O4 and ZrO2-MgAl2O4 materials","authors":"I. Ganesh, B. Srinivas, Roy Johnson, G. Rao, Y. Mahajan","doi":"10.1179/096797803225001632","DOIUrl":"https://doi.org/10.1179/096797803225001632","url":null,"abstract":"Abstract Nanocrystalline MgAl2O4 and ZrO2-MgAl2O4 powders were synthesised by combustion and conventional solid state reaction routes. The synthesised powders were processed, dry pressed, and sintered for 3 h at temperatures ranging from 1550 to 1625°C. The sintered pellets were then characterised in terms of phase (XRD), microstructure (SEM), relative density, apparent porosity, water absorption, hardness, three point bend strength, and fracture toughness. The XRD studies revealed that ZrO2 was present in tetragonal form in the case of combustion synthesised powders (CSP), whereas in powders obtained by solid state reaction (SSP) it was present in the monoclinic form. This study also revealed that the addition of ZrO2 improved the mechanical properties of sintered MgAl2O4 samples: 20 wt-%ZrO2-MgAl2O4 composites prepared from CSPs and conventional SSPs and sintered at 1625°C for 3 h had fracture toughness of 5·96 and 4·33 MPa m1/2 and three point bend strength of 269 and 98 MPa respectively. Higher sintered density, the presence of tetragonal zirconia as a major phase, and the finer microstructure are probably responsible for the superior mechanical properties exhibited by sintered CSP materials as compared with the sintered SSPs.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117057158","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
Electrophoretic deposition of ceramic coatings on ceramic composite substrates 陶瓷复合基材上陶瓷涂层的电泳沉积
British Ceramic Transactions Pub Date : 2003-06-01 DOI: 10.1179/096797803225001605
C. Kaya, F. Kaya, S. Atiq, A. Boccaccini
{"title":"Electrophoretic deposition of ceramic coatings on ceramic composite substrates","authors":"C. Kaya, F. Kaya, S. Atiq, A. Boccaccini","doi":"10.1179/096797803225001605","DOIUrl":"https://doi.org/10.1179/096797803225001605","url":null,"abstract":"Abstract The applicability of electrophoretic deposition (EPD) for the fabrication of single layer and multilayer ceramic coatings on dense ceramic composite materials has been examined. Al2O3/Y-tetragonal zirconia polycrystal (TZP) functionally graded composites of tubular shape were successfully coated with a two layer coating comprising porous alumina and dense reaction bonded mullite layers. The dual layer coating structure was designed to eliminate the numerous cracks caused by volume shrinkage during sintering of the individual EPD formed layers. In another example, mullite fibre reinforced mullite matrix composites were coated with a thin layer of nanosized silica particles using EPD. The aim was to achieve a compressive residual stress field in the silica layer on cooling from sintering temperature, in order to increase composite fracture strength and toughness. The EPD technique proved to be a reliable method for rapid preparation of single layer and multilayer ceramic coatings with reproducible thickness and microstructure on ceramic composite substrates.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121252374","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: 16
Effects of pH on formation and morphology of barium titanate powders prepared by coprecipitation process pH对共沉淀法制备钛酸钡粉体形成和形貌的影响
British Ceramic Transactions Pub Date : 2003-04-01 DOI: 10.1179/096797803225001560
Chung‐Hsin Lu, Hsin-Cheng Hong
{"title":"Effects of pH on formation and morphology of barium titanate powders prepared by coprecipitation process","authors":"Chung‐Hsin Lu, Hsin-Cheng Hong","doi":"10.1179/096797803225001560","DOIUrl":"https://doi.org/10.1179/096797803225001560","url":null,"abstract":"Abstract The effects of pH on the formation and microstructure of barium titanate (BaTiO3) prepared by a coprecipitation process have been investigated. After calcination of the precipitates at 800°C, pure BaTiO3 was formed in samples prepared from oxalic solutions with pH in the range 5-7, and the powders obtained exhibited spherical shape with a size range of 5-10 μm. In contrast, small particles (around 0·1 μm) with Ti enriched phases (BaTi3O7, BaTi4O9) were produced at pH 1, and BaCO3 with irregular shape appeared at pH 10. The phases and morphologies of the calcined powders markedly influenced the sintering behaviour and dielectric properties of BaTiO3. After sintering at 1350°C, densified ceramics with high dielectric constants were derived from the calcined powders containing pure BaTiO3 phase. These results show that close control of the pH of the oxalic solutions is required to produce BaTiO3 powders with high sinterability and high dielectric constant.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124352824","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
Grain growth of zircon pigment in tile glaze 瓷砖釉中锆石颜料的晶粒生长
British Ceramic Transactions Pub Date : 2003-04-01 DOI: 10.1179/096797803225001650
A. Assifaoui, W. Atmani, A. Daoudi, R. Moussa, P. Blanchart
{"title":"Grain growth of zircon pigment in tile glaze","authors":"A. Assifaoui, W. Atmani, A. Daoudi, R. Moussa, P. Blanchart","doi":"10.1179/096797803225001650","DOIUrl":"https://doi.org/10.1179/096797803225001650","url":null,"abstract":"Abstract Glazes for ceramic materials are often opacified by a zircon pigment. The increase in optical density is related to the number and size of pigment particles, which are well dispersed in the glass. Mechanical dispersion by grinding of a fine zircon powder in a raw glaze mixture results in an unoptimised pigment dispersion in the melted glassy phase at high temperature. A significant reduction in the number of particles and a simultaneous large increase in their size is observed. In this case the optical glaze density does not attain the expected value and a very large quantity of zircon must be added. In the present work it is shown that a large part of the zircon reacts with the glass phase during firing. Simultaneously, the remaining zircon grains undergo a large increase in grain size by Ostwald ripening through the liquid phase. This process is characterised by a low activation energy (79 ± 1 kJ mol-1) and a short diffusion path for Zr through the liquid phase between neighbouring grains. The path length is shorter than the size of the larger grains. In the usual firing range, both populations of smaller and larger grains vary in size, the smaller grains favouring growth of the larger grains.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127755802","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
Thermal shock resistance of mullite–cordierite refractories 莫来石-堇青石耐火材料的抗热震性能
British Ceramic Transactions Pub Date : 2003-04-01 DOI: 10.1179/096797803225001542
T. Ebadzadeh
{"title":"Thermal shock resistance of mullite–cordierite refractories","authors":"T. Ebadzadeh","doi":"10.1179/096797803225001542","DOIUrl":"https://doi.org/10.1179/096797803225001542","url":null,"abstract":"Abstract The effect of aggregate size on the strength degradation of mullite-cordierite specimens subjected to thermal shock has been studied. Strength degradation of shocked specimens is shown to depend on the aggregate size, on the preshock strength of sintered specimens, and on cordierite content. Retained strength after shocking increased in specimens prepared from small aggregates owing to the higher initial strength. These specimens contained lower cordierite content as a result of the increased dissociation of cordierite brought about by decreasing the aggregate size.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"424 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121710196","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: 10
Characterisation of grain rearrangement during superplastic creep of Al2O3-ZrO2 composite Al2O3-ZrO2复合材料超塑性蠕变过程中晶粒重排特征
British Ceramic Transactions Pub Date : 2003-04-01 DOI: 10.1179/096797803225001588
F. Béclin, J. Crampon, R. Duclos
{"title":"Characterisation of grain rearrangement during superplastic creep of Al2O3-ZrO2 composite","authors":"F. Béclin, J. Crampon, R. Duclos","doi":"10.1179/096797803225001588","DOIUrl":"https://doi.org/10.1179/096797803225001588","url":null,"abstract":"Abstract An Al2O3-ZrO2 composite specimen has been deformed at 1275°C up to a true compressive strain of 56%, by true strain increments of 14%. At each stage of the test, the same zones on a side face parallel to the compression axis have been investigated by scanning electron microscopy. Several elementary mechanisms occurring during superplastic flow and entailing grain rearrangement have been observed, the predominant one being the neighbour switching event. Neighbour switching is associated with grain disappearance corresponding to grain motion perpendicular to the investigated surface. This contributes to the maintenance of a nearly constant grain size and nearly stable structure. Grain boundary sliding is very active during the test, and involves individual grains, rather than rigid grain groups sliding along 'supergrain' boundaries. The results imply that pure Coble diffusion creep cannot account for deformation in the composite.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"416 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129294891","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: 5
Measurement of dielectric properties of alumina at high temperature while exposed to microwaves 氧化铝在高温微波下介电性能的测量
British Ceramic Transactions Pub Date : 2003-04-01 DOI: 10.1179/096797803225009274
J. Aguilar, J. Pearce
{"title":"Measurement of dielectric properties of alumina at high temperature while exposed to microwaves","authors":"J. Aguilar, J. Pearce","doi":"10.1179/096797803225009274","DOIUrl":"https://doi.org/10.1179/096797803225009274","url":null,"abstract":"Abstract Results are reported of experiments conducted on alumina in a waveguide in order to determine its dielectric properties, using a method based on the six port technique for determining permittivity at high power. The aim of the work was to measure the properties of a relatively large sample, while exposed to microwaves, as a function of temperature. Under these conditions, and especially in the case of large samples, the thermal profile affects overall properties. These aspects are important because these are the conditions that would be present in most microwave processes. Alumina is widely used in the refractory industry, and some published data are considered for comparison.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123497748","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
Effect of pyrophyllite additions on sintering characteristics of fly ash based ceramic wall tiles 叶蜡石掺量对粉煤灰基陶瓷墙砖烧结特性的影响
British Ceramic Transactions Pub Date : 2003-04-01 DOI: 10.1179/096797803225009265
S. Bhasin, S. Amritphale, N. Chandra
{"title":"Effect of pyrophyllite additions on sintering characteristics of fly ash based ceramic wall tiles","authors":"S. Bhasin, S. Amritphale, N. Chandra","doi":"10.1179/096797803225009265","DOIUrl":"https://doi.org/10.1179/096797803225009265","url":null,"abstract":"Abstract The sintering characteristics of fly ash-pyrophyllite mixes containing 0-100 wt-% sericitic pyrophyllite have been studied, using 10 wt-% sodium hexametaphosphate as a binding agent and a firing temperature of 950°C. Increasing pyrophyllite content has been observed to increase the impact strength and apparent density and decrease the water absorption of sintered tile samples. Moreover, the presence of pyrophyllite imparted improved thermal shock resistance to the wall tile samples.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"283 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116399637","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: 24
Sintering of zircon: the role of additives 锆英石烧结:添加剂的作用
British Ceramic Transactions Pub Date : 2003-04-01 DOI: 10.1179/096797803225001551
M. Awaad, S. Kenawy
{"title":"Sintering of zircon: the role of additives","authors":"M. Awaad, S. Kenawy","doi":"10.1179/096797803225001551","DOIUrl":"https://doi.org/10.1179/096797803225001551","url":null,"abstract":"Abstract The sinterability and thermal stability of pure (>99 wt-%), fine (20 μm) zircon containing 1 wt-% of different metal oxides has been studied. Samples were fired up to 1550°C and their densification monitored. The high temperature phases were detected by XRD and the microstructural development of some selected compositions was studied by means of scanning electron microscopy. The results show that, among the oxides studied, Fe2O3, MgO, and TiO2 had the highest densification, although partial dissociation of zircon occurred. These oxides are suggested as sinterable additives to make volume stable sintered aggregates for various refractory applications.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"488 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129479417","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: 9
Optical characteristics of Japanese porcelain bodies prepared from high plastic clay 日本高塑性粘土制瓷体的光学特性
British Ceramic Transactions Pub Date : 2003-04-01 DOI: 10.1179/096797803225001579
T. Sugiyama, Takashi Mori, S. Suzuki
{"title":"Optical characteristics of Japanese porcelain bodies prepared from high plastic clay","authors":"T. Sugiyama, Takashi Mori, S. Suzuki","doi":"10.1179/096797803225001579","DOIUrl":"https://doi.org/10.1179/096797803225001579","url":null,"abstract":"Abstract The absorption and scattering coefficients of porcelain bodies were measured with the aim of improving the optical characteristics of Japanese porcelain prepared from plastic clay. The spectral absorption of the bodies was 0·02-0·07 mm-1, similar to that of European hard porcelain. It was found that absorption could be lowered by increasing the content of alkali metal. Scattering coefficient, 10 mm-1 at 380 nm and 3·0 mm-1 at 780 nm, was much smaller than that of European bodies, which is typical for porcelain produced from Japanese plastic clay. Scattering coefficient varied with wavelength, behaviour which was considered to result mainly from the amount of mullite crystals present. On a reflectance-transmittance diagram, all the data for the Japanese porcelain bodies were on a single curved line, again demonstrating typical optical characteristics for Japanese porcelain bodies produced from plastic clay. Based on these results, a way of improving the whiteness and translucence of Japanese porcelain bodies is discussed.","PeriodicalId":350675,"journal":{"name":"British Ceramic Transactions","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2003-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133611827","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
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