Experimental investigation on the indentation hardness of precursor derived Si–B–C–N ceramics
Experimental investigation on the indentation hardness of precursor derived Si–B–C–N ceramics
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DOI：
10.1016/j.jeurceramsoc.2013.04.025
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发表时间：
2013-11
影响因子：
5.7
通讯作者：
R. Sujith;Ravi Kumar
中科院分区：
文献类型：
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作者：
R. Sujith;Ravi Kumar
通过深度传感纳米压痕技术测定了前体衍生的 Si-B-C-N 陶瓷在接触载荷下的弹塑性响应。将热解时的 Si-B-C-N 陶瓷的压痕响应与热处理后的陶瓷进行了比较。热解时的陶瓷是X射线非晶态的，热处理后的陶瓷是相分离和结晶的。热解陶瓷的硬度和折合弹性模量值分别为～16GPa和～172GPa。热处理后的陶瓷硬度降低至~9GPa，归因于 SiC 和 Si3N4 的相分离和结晶。此外，观察到塑性功比约为 0.3 的高弹性回复，并将其归因于体积控制变形机制。
The elasto-plastic response of the precursor derived Si–B–C–N ceramics upon contact loading was determined by depth sensing nanoindentation technique. The indentation response of as-thermolyzed Si–B–C–N ceramic was compared with the heat-treated counterpart. The as-thermolyzed ceramic was X-ray amorphous and the heat-treated ceramic was phase separated and crystallized. The hardness and reduced elastic modulus values of the as-thermolyzed ceramic were ∼16GPa and ∼172GPa, respectively. The reduction in hardness to ∼9GPa in the heat-treated ceramic was attributed to phase separation and crystallization of SiC and Si3N4. Furthermore, high elastic recovery with a plastic work ratio of ∼0.3 was observed and ascribed to volume controlled deformation mechanism.