复相陶瓷增强颗粒尺寸效应  

SIZE EFFECTS OF STRENGTHENEDPARTICLES OF CERAMIC COMPOSITES

作　　者：金宗哲[1] 张国军[1] 包亦望[1] 白辰阳 岳雪梅[1] 赵宏[1] 

机构地区：[1]中国建筑材料科学研究院高技术陶瓷所

出　　处：《硅酸盐学报》1995年第6期610-617,共8页Journal of The Chinese Ceramic Society

摘　　要：针对不同的增强颗粒与基体的粒径比提出了相应的增强模型，并研究了最优的粒径与体积配比。对均匀分布模型，最优粒径比为ａ／ｂ＝０．２～０．５，体积比为Ｖ＿１＝８．４１（１＋ｂ／ａ）￣３；对增强分布模型，最优粒径比为ａ／６＝０．０２～０．２，体积比为Ｖ＿１＝２．３（１＋ｂ／ａ）。在此基础上建立了界面应力与力学性能及颗粒尺寸之间的关系，结果表明：晶粒尺寸越小强度越高，硬度也越大，但断裂韧性随粒径的变化不大。该研究用于ＳｉＣ纳米颗粒增强Ｓｉ＿３Ｎ＿４及ＺｒＲ＿２陶瓷材料设计，取得了满意的结果。Particulate strengthening models are presented for different ratioes of particle size to matrixsize. The optimum radius ratio and volume ratio are suggested. For even distribution model,the optimum ra-dius ratio is 0.2～0. 5 and volume ratio is 8. 41/ (1 +b/a)￣3. For reinforced model,the optimum radius ratio is0.02～0. 2 and volume ratio is 2.3/(1+b/a).The relatiOnship between interface stresses,mechanical properties and particle size are accordingly derived,indicating that the smaller the partlcle size is,the higher thestrength and hardness are,while the fracturc toughness has minor change with the changing of particle size.These evaluations are applied in the research of Si_2N_4 and ZrB_2 ceramics totighened by nanometer SIC parti-cles,and the results are satisfactory.

关 键 词：颗粒尺寸效应 陶瓷 增强模型 复合陶瓷 

分 类 号：TQ174.758[化学工程—陶瓷工业]