烧结助剂MgO和烧结温度对β-Sialon陶瓷的力学性能影响  

The Influence of the Sintering Additive MgO and the Sintering Temperature on Mechanical Properties of β-Sialon Ceramics

作　　者：范国峰[1] 郭英奎[1] 白晓杰[1] 李梦萱[1] 

机构地区：[1]哈尔滨理工大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《哈尔滨理工大学学报》2015年第1期12-15,共4页Journal of Harbin University of Science and Technology

摘　　要：以α-Si3N4粉、α-Al2O3粉和Al N粉及烧结助剂MgO为原料,采用热压烧结的工艺制备了β-Sialon陶瓷材料,研究了烧结助剂MgO和烧结温度对sialon陶瓷力学性能和组织形貌的影响.结果表明,加入烧结助剂MgO提高了β-sialon陶瓷的致密度且降低了烧结温度,随着烧结温度的升高,β-sialon陶瓷抗弯强度、断裂韧性呈先增加后降低的变化规律,当烧结温度为1600℃时制备的β-sialon陶瓷材料结合紧密,抗弯强度以及断裂韧性达到最大,值分别为423 MPa、2.73 MPa·m1/2,材料的断裂方式主要是沿晶断裂.β-Sialon ceramics were prepared by reactive hot pressing sintefing method with a-Si3 N4, a-A12 03, and sintering additive MgO as raw materials. Effect of sintering additive MgO and the sintering temperature on me- chanical property and morphology were systematically studied. The results indicate that the sintering additives MgO greatly improve β-Sialon ceramics density and reduce the sintering temperature. Along with the sintering tempera- ture increasing, the bending strength and the fracture toughness of β-Sialon ceramics increased before they are low- er. At the sintering temperature of 1 600 ℃, the preparation of β-Sialon ceramics obtained the highest bending strength and fracture toughness, the value（423 MPa, 2.73 MPa·m1/2） , combined closely. The principal fracture mode of composites is intergranular fracture.

关 键 词：β-Sialon陶瓷材料 MGO 烧结温度 力学性能 

分 类 号：TB34[一般工业技术—材料科学与工程]