摘要
使用与实际生产相接近的Al2O3-Si-Al原料系统,利用连续称重法,详尽描述试样在升温氮化过程中的重量变化,通过热分析以求得Al2O3-Si-Al原位反应系统的反应活化能。研究表明,Al2O3-Si-Al系统的氮化反应在900～1150℃,反应活化能为E=58.5kJ·mol-1,在1200～1450℃,反应活化能为E=27.26kJ·mol-1。探讨具有一定颗粒级配构成的原位反应系统制成的坯体直接氮化烧结的反应机理及反应参数,力求为原位合成复相Sialon的工业化生产提供一些工艺指标和影响因素。
The reaction process of the raw materials near to practical production in high, medium and low temperature by continuously weighting method was studied, and the mass change of the sample in the heating nitridation process was exhaustively described. The activation energy of Al2O3-Si-Al in-situ reaction system by thermal analysis was calculated. The reaction mechanism and parameters of the direct nitridation sintering of the green body prepared by in-situ reaction system with different particle levels was also investigated. Some technical index and effect parameters of the industrial production of in-situ synthesis multi-phase Sialon were suggested. The results show that： the nitridation reaction rate of Al2O3-Si-Al system is controlled by the chemical reaction in 900- 1150℃, activation energy E=58.5 kJ·mol^-1 that is controlled by diffusion reaction in 1200- 1450 ℃, activation energy E=27.26 kJ·mol^-1.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2007年第A01期207-210,共4页
Rare Metal Materials and Engineering
作者简介
王黎，博士生，西安建筑科技大学材料科学与工程学院，陕西西安710055，E-mail：Wangli64332@sina．com
