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Properties of Hot Compressed 21R SiAlON Ceramics with a Samarium Oxide Additive
Russian Journal of Inorganic Chemistry ( IF 1.8 ) Pub Date : 2021-08-24 , DOI: 10.1134/s0036023621080143
A. S. Lysenkov 1 , D. D. Titov 1 , K. A. Kim 1 , M. D. Mel’nikov 1, 2 , M. G. Frolova 1 , N. V. Petrakova 1 , S. N. Ivicheva 1 , Yu. F. Kargin 1 , D. V. Gridin 3
Affiliation  

Abstract

The compaction of initial powders, the bending strength, and the microhardness of 21R sialon ceramics obtained by hot pressing have been studied experimentally. It is found that the Sm2O3 sintering additive substantially reduces the annealing temperature and enhances the properties of the ceramics. The samples of 21R sialon ceramics without additives, which are prepared by annealing at 1950°C, have a density of 3.01 g/cm3, a bending strength of 240 ± 15 MPa, and a Vickers microhardness of 16.2 ± 0.4 GPa; the samples of 21R sialon ceramics with 2.5 wt % Sm2O3, which are annealed at 1750°C, are characterized by a density of 3.39 g/cm3, a bending strength of 315 ± 16 MPa, and a Vickers microhardness of 21.9 ± 0.2 GPa. It is shown that Sm2O3 reacts with 21R sialon in the temperature range of 1600–1700°C to form the 27R sialon and SmAlO3 impurity phases. In the samples annealed at 1750°C, the 27R sialon and Sm–sialon (Sm3Si2.5Al3.5O12.5N1.5) impurity phases are detected.



中文翻译:

含氧化钐添加剂的热压 2​​1R SiAlON 陶瓷的性能

摘要

对热压得到的21R赛隆陶瓷的初始粉末压实度、抗弯强度和显微硬度进行了实验研究。发现Sm 2 O 3烧结添加剂显着降低了退火温度并提高了陶瓷的性能。1950℃退火制备的无添加剂21R赛隆陶瓷样品,密度为3.01 g/cm 3,抗弯强度为240±15 MPa,维氏显微硬度为16.2±0.4 GPa;含有 2.5 wt% Sm 2 O 3的 21R 赛隆陶瓷样品在 1750°C 下退火,其特征在于密度为 3.39 g/cm 3,弯曲强度为 315 ± 16 MPa,维氏显微硬度为 21.9 ± 0.2 GPa。结果表明,Sm 2 O 3与 21R 赛隆在 1600-1700°C 的温度范围内反应形成 27R 赛隆和 SmAlO 3杂质相。在 1750°C 退火的样品中,检测到 27R 赛隆和 Sm-赛隆(Sm 3 Si 2.5 Al 3.5 O 12.5 N 1.5)杂质相。

更新日期:2021-08-25
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