Reactive spark plasma sintering of ZrB2-TiC composites: Role of nano-sized carbon black additive

Hamid Istgaldi, M. Mehrabian, F. Kazemi, Behzad Nayebi
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引用次数: 4

Abstract

ZrB2-TiC composites with and without nano-sized carbon black as the sintering additive were densified through spark plasma sintering at 1900 °C for 7 minutes under the applied pressure of 40 MPa. The role of carbon black in densification behavior, phase arrangement, microstructural characteristics and mechanical properties of the sintered composites were then investigated. While both of the composite samples were found to be fully sintered, the thermodynamic of the reactive sintering was also studied. Results indicated that whereas the reactive sintering process leads to complete consumption of TiC through the formation of the solid solution as the matrix in both of the composite samples, the presence of carbon black at the initial composition of the samples can result in remained carbon at the final microstructure. Besides the in-situ synthesized zirconium carbide as the major reinforcement phase, such a remained carbon can lead to significantly different mechanical behavior of the composites. Accordingly, the hardness of 21.8 and 24.3 GPa and the indentation fracture toughness of 3.3 and 4.5 MPa.m0.5 were obtained for carbon-black free and doped samples, respectively. The densification, hardening, and toughening mechanisms in both of the composite samples were finally discussed.
反应放电烧结ZrB2-TiC复合材料:纳米炭黑添加剂的作用
以纳米炭黑为烧结添加剂和不添加纳米炭黑为烧结添加剂的ZrB2-TiC复合材料,在40 MPa的压力下,在1900℃下烧结7 min,进行了烧结致密化。研究了炭黑对烧结复合材料致密化行为、相排列、显微组织特征和力学性能的影响。结果表明,两种复合材料均达到了完全烧结状态,并对反应烧结的热力学性质进行了研究。结果表明,反应烧结过程通过在两种复合样品中形成作为基体的固溶体导致TiC的完全消耗,而样品初始成分中炭黑的存在会导致最终微观结构中残留碳。除了原位合成的碳化锆作为主要的增强相外,这种残余的碳会导致复合材料力学行为的显著不同。因此,无炭黑和掺杂样品的硬度分别为21.8和24.3 GPa,压痕断裂韧性分别为3.3和4.5 MPa.m0.5。最后讨论了两种复合材料的致密化、硬化和增韧机理。
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