摘要
自从熔铸材料(AZS)问世至今已60余年。其间,AZS质材料品种有许多发展并形成一个系列化产品,同时,其它材料多元组成的熔铸法制造也相续问世。熔铸方法制造的高级耐火材料工业化应用上具有独特的优越性能,而与之相同组成的以烧结方法制造产品相比,如抗侵蚀指数,几乎是后者的2倍。这些根本的差异在于熔铸材料是经过超过熔点温度以形成熔融物之后,再逐渐冷却凝固过程,其间形成良好结晶相和多相相嵌(共析)结构。
The samples of fusion cast zirconia corundum refractory (AZS) serial products (containing ZrO2 33%, 36% and 41%) were studied. By analyzing chemical compositions of the samples from different layers of blocks, and by observing the samples with reflective microscope, it is demonstrated in this paper that the segregation of chemical compositions of the products was quite apparent, and the structure of the products were inhomogeneous, while the Al2O3/SiO2 weight ratio of different layers changed slightly. In accordance with the phase equilibrium principle of Al2O3ZrO2-SiO2 ternary system, and supported by the abundant data of segregation of chemical compositions, it has been proved that the result of analysis is in keeping with some scholars' description about the 'Structural Model of Segregation and Solidification Process of ZrO2 Primary Crystalline Phase in Fusion Cast AZS Refractories'. The factor causing segregation during the solidification of fusion east AZS refractories is that, under the action of gravity field, ZrO2 primary crystalline phase is induced by the variation of temperature field. It deposits and accumulates, presenting the phenomenon of segregation, of which the transitional zone is rich in ZrO2 phase.
出处
《玻璃与搪瓷》
CAS
北大核心
1993年第4期13-19,共7页
Glass & Enamel
