添加Y2O3对ZrN(ZrON)-SiAlON性能的影响

为了以较低成本制备较高性能的ZrN(ZrON)-SiAlON复合陶瓷材料,先以粉煤灰、锆英石和活性炭为主要原料,经碳热还原氮化法合成ZrN-SiAlON复合粉;然后在ZrN-SiAlON复合粉中添加不同量(质量分数分别为0、5%、10%)的Y2O3,在1500℃保温1 h埋碳烧结制备了ZrN(ZrON)-SiAlON复合陶瓷材料,并研究了ZrN(ZrON)-SiAlON复合陶瓷材料的相组成、烧结性能和力学性能等。结果表明:Y2O3可促进ZrN和β-SiAlON等主晶相的形成,同时促进材料的烧结致密化。添加5%(w)的Y2O3制得的ZrN(ZrON)-SiAlON复合陶瓷材料的显气孔率为5.3%,体积密度为3.47 g·cm-3,常温耐压强度为29.4 MPa,性能较优。

Effect of Y2O3 addition on properties of ZrN(ZrON)-SiAlON composite ceramics

In order to prepare high-performance ZrN(ZrON)-SiAlON composite ceramic materials at low cost,the ZrN-SiAlON composite powders were synthesized by carbothermal reduction-nitridation with fly ash,zircon and activated carbon as the main raw materials.The ZrN(ZrON)-SiAlON composite ceramics were then prepared by adding different amounts of Y2O3(0,5%and 10%,by mass)and sintering at 1500℃for 1 h with carbon embedded to research their phase composition,sintering properties and mechanical properties.The results show that Y2O3 can promote the formation of main crystal phases such as ZrN andβ-SiAlON improving the sintering densification of the specimens;when adding 5%Y2O3,the ZrN(ZrON)-SiAlON composite ceramic has the apparent porosity of 5.3%,the bulk density of 3.47 g·cm-3 and the cold compressive strength of 29.4 MPa,showing excellent performance.