摘要
二硼化锆具有优异的高温性能,常被作为超高温材料应用,为了能够得到性能优异的二硼化锆复合材料,本文研究了二硼化锆基复合材料高温氧化行为。研究结果表明:随着氧化温度的升高,Zr B2-YAG-Al2O3复合材料的氧化增重率增加,在1 100℃以下复合材料的增重率变化趋势不明显,而在1 100℃以上复合材料的增重率变化趋势较为显著,因此,1 100℃确定为Zr B2-YAG-Al2O3复合材料高温抗氧化性能的温度临界值。在一定的氧化温度条件下,Zr B2-YAG-Al2O3复合材料的氧化增重率的速率随着氧化时间的延长而降低。不论是增加增强相含量,还是改善制备条件,在使得材料致密化程度更高的情况下,都可以使得Zr B2-YAG-Al2O3复合材料的高温抗氧化能力得以提高。
A ZrB2 belongs to a class of ceramics defined ultra-high-temperature materials with extremely high melting temperatures. To make high property ZrB2 matrix composite materials, the oxidation behavior of YAG-ZrB： composite materials was investigated. The gain weight of ZrB2-YAG-Al2O3 composites are increased with increasing the oxidation temperature, the gain weight rate of materials are almost unchangeable at 1 100 ℃ , the gain weight rate of materials are increased significantly above 1 100 ℃ , a critical temperature of antioxidant properties of ZrBE-YAG-Al2O3 composites is shown at 1100℃. The gain weight rate of ZrB2 matrix composites are reduced with the extension of oxidation time in the same oxidation temperature, antioxidant properties of ZrB2-YAG-Al2O3 composites are increased through increasing the densification degree with increasing the reinforced phase content and improving the preparation technology. The antioxidant properties of ZrB2-YAG-Al2O3 composites are increased through increasing the densifieation degree with increasing the reinforced phase content and improving the preparation technology.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2015年第5期336-340,364,共6页
Powder Metallurgy Technology
基金
江西省教育厅科学技术研究基金(GJJ13720)
九江学院科技重点项目(2014KJZD004)
江西省“十二五”重点学科(材料加工工程)建设项目
九江市“双百双千”人才工程建设项目
关键词
超高温材料
二硼化锆
复合材料
氧化行为
Ultra-high-temperature materials, ZrB2 , Composite materias, Oxidation behavior
