Strip‐shaped W₂B₅ reinforced B₄C ceramic composites were prepared via in situ reaction of boron(B)‐graphite(Gr)‐WC system by powder metallurgy (P/M). In order to study the effect of the graphite content on the properties of the as‐fabricated ceramic composites, the powder mixture of B‐Gr‐WC with various amounts of Gr powder were blended and consolidated by spark plasma sintering (SPS). The sintering parameters were shown as following: sintering pressure was set as 30 MPa; The three‐step sintering temperature was 1100‐1550‐1700°C and the duration time was set as 5‐5‐6 minutes, respectively. In situ formed strip‐shaped W₂B₅ particles were dispersed homogeneously in B₄C matrix, which resulted in a remarkable improvement on the fracture toughness and mechanical properties. Appropriate 5vol% residual Gr in the composite shows positive effect on the mechanical properties which achieved an optimal counter‐balance of fracture toughness and hardness, the relative density was 99.8%, the Vickers hardness can reach 30.2 GPa, and the fracture toughness was 11.9 MPa·m^1/2 when the sintering temperature was set at 1700°C.

中文翻译：

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B-Gr-WC原位反应对石墨含量对B4C-W2B5陶瓷复合材料性能的影响

通过粉末冶金（P / M）原位反应制备硼（B）-石墨（Gr）-WC体系的带状W ₂ B ₅增强B ₄ C陶瓷复合材料。为了研究石墨含量对预制陶瓷复合材料性能的影响，通过火花等离子体烧结（SPS）将B-Gr-WC与各种含量的Gr粉末的粉末混合物进行混合和固结。烧结参数如下：烧结压力设定为30MPa；烧结压力设定为30MPa。三步烧结温度为1100-1550-1700°C，持续时间分别设置为5-5-6分钟。原位形成的带状W ₂ B ₅颗粒均匀分散在B _4中C基体，使断裂韧性和机械性能得到显着改善。复合材料中适当的5vol％残余Gr对机械性能产生积极影响，实现了断裂韧性和硬度的最佳平衡，相​​对密度为99.8％，维氏硬度可以达到30.2 GPa，断裂韧性为11.9 MPa烧结温度为1700℃时，·m ^1/2。