引入TaSi_2对ZrB_2-20%SiC抗氧化性能的影响

Effects of Ta-Additions on the Oxidation of ZrB_2-20% SiC

将TaSi_2引入到ZrB_2-20%SiC中得到ZrB_2-10%SiC-10%TaSi_2,并在1 000、1 200、1 500和1650℃有氧条件下分别氧化5、15和30 min。复合材料通过热压烧结法制备(1 950℃/30 MPa/30 min),并通过XRD及SEM等方法对氧化后的质量变化及微观结构进行了分析。结果表明,TaSi_2的引入提高了Zr B2-20%SiC的致密度和力学性能,但是在1 200℃以上温度氧化时,ZrB_2-10%SiC-10%TaSi_2的抗氧化性有所降低。

TaSi2 was added into ZrB2-20%SiC to get ZrB2-10%SiC-10%TaSi2. Then composites were oxidized in stagnant air at 1000℃, 1200℃, 1500℃ and 1650℃ for 5 min, 15 min,30 min.The composites were prepared by hot pressed sintering （ 1950℃/30 MPa/30 min） and analyzed by X-ray diffraction and SEM.The weight change due to oxi- dation and microstructure were recorded. The results show the density and mechanical properties are increased by adding TaSi2 into ZrB2-20%SiC,but the oxidation resistance of ZrB2-10%SiC-10%TaSi2 is decreased above 1200℃.