直接合成工艺下添加剂Si_3N_4/AlN对Sialon/刚玉复合材料组织和性能的影响  

Effect of Si_3N_4/AlN Additives on Microstructure and Properties of Sialon Bonded Corundum Refractory by Synthesizing Technique Directly

作　　者：巩甘雷[1] 唐骥[1] 茹红强[1] 张宁[1] 孙旭东[1] 

机构地区：[1]东北大学材料与冶金学院,辽宁沈阳110004

出　　处：《铸造》2004年第3期207-210,共4页Foundry

基　　金：国家863资助项目(2002AA33408);河北省科学研究计划(98212210D)

摘　　要：以棕刚玉、Al、Si、Al2O3为原料、采用一步工艺合成了Sialon/刚玉复合材料。研究了一步合成工艺条件下添加剂对复合材料组织、性能以及复合材料中N含量的影响。结果表明,当氮化温度超过1330℃,氮化时间超过8h后,添加Si3N4/AlN的材料中N含量基本上达到饱和值,添加Si3N4/AlN可以降低Sialon相的合成温度;1230～1280℃是一个重要的前期氮化温度,添加Si3N4/AlN的材料在该温度可完成整个氮化反应的94 24%,早期对Al、Si的充分氮化有利于Sialon相的生成和晶形完整发育。A Sialon/corundum multiphase refractory was synthesized directly using silicon powder, aluminum powder and black corundum as starting materials. Effects of Si_3N_4/AlN additives on N contents, modulus of rupture and microstructure of Sialon were investigated. With the increasing of Si_3N_4/AlN contents, the N contents of the materials increase, the flexural strength of the materials reaches the maximum at 1.5% (mass fraction). N contents of the specimen approach saturation after nitriding at 1330℃, 8 hours dwell. Additives may strongly decline the synthesizing temperature of the specimen. It is an important initial nitriding phase at 1230～1280℃. In this phase, N contents of the materials reach 94.24% (mass fraction) and it is also beneficial to formation and growth of Sialon crystal that silicon powder and aluminum powder are nitrided enough in second stage.

关 键 词：Sialon/刚玉复合材料 Z值 合成工艺 氮含量 显微组织 

分 类 号：TB332[一般工业技术—材料科学与工程]