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R-curve analysis of solid-phase-sintered and liquid-phase-sintered silicon carbide ceramics by indentation fracture and indentation-strength-in-bending methods

机译:压痕骨折和压痕强度 - 弯曲方法的固相烧结和液相烧结碳化硅陶瓷的R曲线分析

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The R-curve behavior of SiC ceramics was investigated from aspects of microstructure and test methods. Two groups of silicon carbide ceramics were prepared by solid-phase-sintering and liquid-phase-sintering methods. One from each, determined by systematic evaluation on microstructure and mechanical properties, was selected for. R-curve behavior study by two methods of IF and ISB. It is found that for both SSiC and LSiC, IF fracture toughness decreases while the ISB one increases with the increasing indentation load inconsistent R-curve behaviors observed with different method. IF and ISB methods were examined on its own theoretical basis and ISB method was determined the correct method for R-curve evaluation of SSiC and LSiC. That LSiC ceramic possesses better mechanical properties than SSiC material, indicated by ISB R-curve, well matches the mechanical evaluations. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
机译:从微观结构和试验方法的各方面研究了SiC陶瓷的R曲线行为。 通过固相烧结和液相烧结方法制备两组碳化硅陶瓷。 选择通过对微观结构和机械性能的系统评价确定的每一个。 r-curve行为通过两种方法研究IF和ISB。 发现对于SSIC和LSIC,如果断裂韧性降低,而ISB一个随着用不同方法观察到的缩进负载不一致的R曲线行为而增加。 如果在自己的理论基础上检查和ISB方法,确定了SSIC和LSIC的R曲线评估的正确方法。 该LSIC陶瓷具有比SSIC材料更好的机械性能,由ISB R曲线表示,良好匹配机械评估。 (c)2015 Elsevier Ltd和Techna Group S.R.L. 版权所有。

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