推  荐  人:鲁毓钜

文献信息1Galusek D, Ghillanyova K, Sedláček J, et al. The influence of additives on microstrucutre of sub-micron alumina ceramics prepared by two-stage sintering [J]. Journal of the European Ceramic Society, 2012, 32(9): 1965–1970.

推荐理由:陶瓷的两步烧结可以在促进陶瓷致密化的同时,抑制晶粒长大。作者研究了氧化铝陶瓷体系中,MgOY2O3ZrO2三种烧结助剂在不同烧结条件下对氧化铝陶瓷的致密度和晶粒形貌的影响。结果表明:MgO会促进致密化,而Y2O3ZrO2会阻碍致密化,但是三者都可以抑制晶粒生长。本文对理解陶瓷的致密化过程、不同烧结助剂在致密化过程中起的作用有很大帮助。

下载地址:https://www.sciencedirect.com/science/article/pii/S0955221911006303

AbstractFor various systems two-stage sintering has been reported as a successful way of suppressing the grain growth in the final stage of densification of polycrystalline ceramics. Our previous results on two-stage sintering of high purity submicrometre polycrystalline alumina indicate limited efficiency of the process with respect to suppression of grain growth. The present work deals with the influence of deliberate additions of various metal oxides (500 ppm of MgO, Y2O3 or ZrO2) whose grain growth retarding effect in conventional sintering has been well documented, on two-stage sintering of submicrometre alumina ceramics. The addition of MgO was observed to enhance densification. Addition of yttria and zirconia impaired densification, but addition of all three dopants resulted in suppression of the grain growth and microstructure refinement in comparison to undoped alumina.

文献信息2Viswabaskaran V, Gnanam F D, Balasubramanian M. Effect of MgO, Y2O3 and boehmite additives on the sintering behaviour of mullite formed from kaolinite-reactive alumina [J]. Journal of Materials Processing Technology, 2003, 142(1): 275–281.

推荐理由:作者研究了高岭土和氧化铝的莫来石化过程中,MgOY2O3和勃姆石对烧结过程的影响。研究发现,MgO可以促进莫来石晶粒的生长,Y2O3对二次莫来石的形成有促进作用、对一次莫来石影响不大,勃姆石的加入有助于形成大小均匀的一次、二次莫来石。本文对于我们了解温度、原料、添加剂对莫来石化的影响,理解莫来石化过程很有帮助。

下载地址:https://www.sciencedirect.com/science/article/pii/S0924013603005776

AbstractReaction sintering of clay and reactive alumina is an innovative as well as cost effective method of mullite formation. In the present investigation, clay obtained from Neyveli (South India) and reactive alumina (mean particle size of 0.7 μm) were used as starting materials. To improve the densification of mullite, magnesia and yttria (1–5 wt.%) were used as sinter additives to the above materials. Boehmite was partly substituted for reactive alumina (1–7 wt.%). As per the stoichiometric composition the raw materials were mixed, uniaxially pressed and sintered at 1500, 1550 and 1600°C for 3 h. Among the sintered samples, the samples sintered at 1600°C exhibited better properties. The 3 wt.% MgO addition showed improved density up to 2.91 g cm−3 with the maximum strength of 125 MPa. Y2O3 addition favoured the development of equiaxed mullite, but did not help to increase the density and strength. The boehmite substitution (5 wt.%) yielded maximum density of 96% theoretical density (3.01 g cm−3) and strength of 120 MPa. Microstructural studies showed that the addition of boehmite resulted in a blend of small to bigger crystals throughout the structure.


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