Influence of Heat Treatment Temperature on Self-healing Effect of Fe Particle/Mullite Ceramic Composites
Influence of Heat Treatment Temperature on Self-healing Effect of Fe Particle/Mullite Ceramic Composites
复制标题
DOI：
10.2355/tetsutohagane.tetsu-2020-036
复制
发表时间：
2020-11-01
影响因子：
0.3
通讯作者：
Kasai, Eiki
中科院分区：
文献类型：
--
作者：
Maruoka, Daisuke;Murakami, Taichi;Kasai, Eiki
陶瓷基复合材料的自修复功能是提高其强度可靠性的独特特性之一。本文研究了5vol%Fe/2mol%Y_2O_3/Mullite复合材料在不同热处理温度下的强度恢复现象，并对致密矩形试样进行了维氏压痕试验。样品在空气或Ar-3%H-2气氛中在700 - 1000 ℃下热处理1 h，然后在室温下进行三点弯曲试验。在空气中热处理后的样品的XRD谱图中鉴定出赤铁矿峰。由于氧化产物的形成，表面裂纹大部分消失，即，通过在空气中在900 ℃下热处理1小时形成的颗粒状赤铁矿。此外，通过在1000 ℃下的热处理形成针状赤铁矿并渗透到样品表面中。而在Ar-3%H-2气氛中处理的样品没有观察到氧化物的形成。抛光和开裂样品的弯曲强度分别为334和99 MPa。回收率随着热处理温度的增加而增加，直到900摄氏度。在900 ℃下热处理1小时，导致弯曲强度恢复到262 MPa。而在1000 ℃空气中处理1小时的样品的弯曲强度为204 MPa。针状赤铁矿降低了试样的力学性能。在900 ° C下处理1小时空气的样品的弯曲强度为112 MPa，由于没有形成氧化产物，因此开裂样品的弯曲强度也为112 MPa。
Self-healing function in ceramic-based composites is one of unique characteristics to improve the strength reliability. In this study, such a strength recovery phenomenon of 5 vol% Fe particle/2 mol% Y2O3/Mullite composite was investigated at various heat treatment temperatures.Vickers indentation were conducted with dense rectangular samples. Samples were heat treated at 700 -1000 degrees C for 1 h in air or Ar-3%H-2 atmosphere and then 3-point bending test was carried out at room temperature. Peaks of hematite were identified in the XRD profiles of the samples after heat treatment in air. Surface cracks mostly disappeared due to formation of the oxidation product, i.e., particle-like hematite formed by the heat treatment at 900 degrees C in air for 1 h. Further, needle-like hematite formed and penetrated into the sample surface by the heat treatment at 1000 degrees C. While, oxide formation was not observed for the sample treated in Ar-3%H-2 atmosphere. The bending strengths of the as-polished and as-cracked samples were 334 and 99 MPa, respectively. Recovery rate is increased with increasing heat treatment temperature up to 900 degrees C. Heat-treatment at 900 degrees C for 1 h resulted in a recovery of the bending strength up to 262 MPa. While, bending strengths of the samples treated at 1000 degrees C for 1 h air was 204 MPa. It appears that needle like hematite degrades mechanical properties of the samples. Bending strengths of the samples treated at 900 degrees C for 1 h air was 112 MPa as well as as-cracked sample due to no formation of oxidation product.