Y_2O_3掺杂ZrB_2-SiC基超高温陶瓷的抗烧蚀性能  

Ablation Resistance Behavior of ZrB_2-SiC Ultra-High Temperature Ceramics with Y_2O_3 Addition

作　　者：李学英[1] 张幸红[1] 韩杰才[1] 韩文波[1] 洪常青[1] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150001

出　　处：《稀有金属材料与工程》2011年第5期820-823,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金项目(50602010;50702016);国防预研基金(BAQQ24402052);博士后基金(BAQQ24403037)

摘　　要：为改善ZrB2-SiC基超高温陶瓷的抗氧化和抗烧蚀性能,在制备过程中加入Y2O3。用氧乙炔火焰法来考察ZrB2-SiC-Y2O3的抗氧化和抗烧蚀性能。采用SEM和XRD分析烧蚀前后形貌及物相。材料在加热和冷却过程中没有出现开裂现象,说明其具有良好的抗热冲击性能。微观组织分析表明,氧化层主要由4层组成,且氧化层与基体层没有明显的剥离。结果表明:Y2O3的添加可以将氧化产物中的高温稳定相稳定到室温,减少由于相变发生的体积膨胀,改善氧化层与基体层的粘结性能。In order to improve the oxidation resistance and ablation resistance of ZrB2-SiC ultra-high temperature ceramics（UHTCs）,Y2O3 particles were introduced during the fabrication process of the ZrB2 based UHTCs.The oxidation-resistance and ablation-resistance of ZrB2-SiC-Y2O3 UHTCs were investigated using oxyacetylene torch test.The microstructures and phases of ZrB2-SiC-Y2O3 before and after ablation were studied by SEM and XRD.No cracks are found on the ablated surface during the process of heating and cooling,indicating that ZrB2-SiC-Y2O3 UHTCs have good thermal shock resistance.Microstructure analysis shows that the oxidation layer is composed of 4 layers and there is no obvious exfoliation between the oxidation layer and the substrate layer.The results show that high temperature stable phase t-ZrO2 in the oxidation product can be kept at low temperature by the addition of Y2O3,thus reducing the volume expansion owing to transformation and improving coherent properties of oxidation layers.

关 键 词：ZrB2-SiC基超高温陶瓷 Y2O3 氧化 烧蚀 

分 类 号：TQ174.758.1[化学工程—陶瓷工业]