Ti(C,N)对刚玉质浇注料性能的影响

Influence of Ti(C,N) on properties of corundum based castables

骨料采用电熔白刚玉,基质采用白刚玉细粉、活性α-Al2O3微粉、SiO2微粉及Ti(C,N)微粉,按骨料与基质质量比为70:30,α-Al2O3微粉和Ti(C,N)微粉总质量分数固定为10%,制备了Ti(C,N)含量(质量分数)分别为0、5%和10%的三种刚玉质浇注料,对比了三种材料的常温物理性能、抗碱(K2O)性能及抗渣性能,并借助XRD和光学显微镜研究了材料的物相组成和显微结构。结果表明:加入Ti(C,N)后,刚玉质浇注料经1500℃3h热处理后强度显著增大,抗碱(K2O)性能及抗渣性能随Ti(C,N)加入量的增加而逐渐提高。其主要机理为:Ti(C,N)促进了材料的高温烧结,改善了材料的显微结构;同时Ti(C,N)化学稳定性优良,难于被熔渣润湿,材料基质中均匀分散的Ti(C,N)减弱了碱(K2O)及熔渣对刚玉质浇注料的渗透和侵蚀。

Three kinds of corundum based castables containing Ti（C,N） of 0.5% and 10% （mass） respectively were prepared,by using white fused corundum as aggregate and white corundum powder, active α-Al2O3 micropowder,silica fume and Ti （C, N） micropowder as matrix, according to the mass ratio of aggregate and matrix 70：30 and fixed total mass percentage of α-Al2O3 and Ti（ C, N） micropowder 10%. The physical properties at room temperature, alkali （K2O） resistance and slag resistance were compared. The phase composition and microstructure of the specimens were investigated by XRD and optical microscope. The results show that the strength of Ti（ C, N） containing corundum based castables fired at 1500 ℃ for 3 h increases apparently,the alkali（ K2O） resistance and slag resistance improve gradually with the increase of Ti（C,N） addition. The main mechanism is that Ti （C, N） improves the sintering property of the material, and therefore optimizes the microstructure. Besides, Ti （ C, N） has excellent chemical stability, which is hardly moisten by molten slag. Ti（C,N） evenly dispersing in the matrix retards the penetration and corrosion of K2O and molten slag.