摘要
研究了CaO稳定的氧化锆、锆英石、Si3N4及活性-αA l2O3体系反应烧结制备O-′Sialon-ZrO2复相材料过程中物相组成的变化及显微结构特征。结果表明,1 550℃下体系中已经形成了所谓的过渡液相,这种过渡液相的存在,加速了锆英石的分解,促进了O-′Sialon“溶解-扩散-再结晶”的结晶过程。1 600℃及以上温度烧后,锆英石完全分解。随着烧结温度的提高,基质中O-′Sialon针状晶体发育长大并形成了比较紧密的、晶体间相互交织的显微结构。与此同时,由于Ca2+的脱溶,稳定氧化锆骨料大晶粒分解为相对细小的m-ZrO2。
Phase composition and microstructure of O＇-Sialon-ZrO2composite during the process of reaction sintering based on the formula of CaO stabilized ZrO2 , zircon, Si3N4 and Al2O3, as starting materials are investigated. The results show that, at 1550 ℃, the transient liquid is formed in the samples, which accelerates the - decomposition of zircon and the ＂solution-diffusion-reprecipitation＂ process of O＇-Sialon. When heated at 1 600 ℃ and up, zircon in the samples is completely decomposed and O＇-Sialon crystals well develope and form a matrix texture,while coarse particles of stabilized ZrO2 are decomposed into small particles of m-ZrO, due to the dissolution of Ca^2＋ from stabilized ZrO2.
出处
《武汉科技大学学报》
CAS
2005年第3期221-224,共4页
Journal of Wuhan University of Science and Technology
