结合系统对刚玉基浇注料常温断裂行为的影响

发布时间：2018-03-08 16:22

本文选题：结合体系　切入点：断裂行为　出处：《耐火材料》2017年06期 　论文类型：期刊论文

【摘要】：为揭示结合系统对刚玉基浇注料常温断裂行为的影响,以板状刚玉颗粒、板状刚玉细粉、α-Al2O3微粉、Si O2微粉、纯铝酸钙水泥和水合氧化铝为主要原料,通过改变基质中纯铝酸钙水泥的加入量(加入质量分数分别为0、1%、3%和5%),制备了低水泥、超低水泥和无水泥刚玉基浇注料,采用楔入劈拉法研究了刚玉基浇注料的断裂行为。结果表明:结合体系的不同显著改变了浇注料的断裂行为。低水泥和超低水泥刚玉基浇注料的载荷-位移曲线呈线性,属典型的脆性断裂,表明浇注料的韧性差。无水泥刚玉基浇注料的载荷-位移曲线呈非线性,属准稳态断裂,说明浇注料的韧性高。含水泥浇注料中结合相为玻璃相或钙长石,玻璃相多且连续分布导致浇注料呈脆性。而在无水泥浇注料中,结合相为针柱状莫来石,玻璃相少且孤立分布于莫来石形成的网络中,有利于韧性的提高。
[Abstract]:In order to reveal the effect of bonding system on fracture behavior of corundum based castable at room temperature, the main raw materials were slab corundum particles, plate-shaped corundum fine powder, 伪 -Al _ 2O _ 3 micro-powder and Sio _ 2 micropowder, pure calcium aluminate cement and alumina hydrate. Low cement, ultra-low cement and cementless corundum based castables were prepared by changing the content of pure calcium aluminate cement (0 1% and 5%) respectively. The fracture behavior of corundum based castable was studied by wedge splitting method. The results showed that the fracture behavior of castable was changed significantly with different systems. The load-displacement curves of low cement and ultra-low cement corundum based castables were linear. It is a typical brittle fracture, indicating that the toughness of castable is poor. The load-displacement curve of cementless corundum based castable is nonlinear, which indicates that the toughness of castable is high. The combination phase of cement-containing castable is glass phase or calcium feldspar. In the cementless castable, the bonded phase is needle columnar mullite, and the glass phase is less and isolated in the network formed by mullite, which is beneficial to the improvement of toughness.
【作者单位】：河南科技大学高温材料研究院;
【基金】：国家自然科学基金项目(51402089) 河南省高等学校青年骨干教师资助计划(2015GGJS-045) 河南省科技攻关项目(162102210206)
【分类号】：TQ175.732

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