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Sintering of BN/cemented carbide composites under an electric field for improved mechanical performances

机译：在电场下BN /硬质合金复合材料的烧结，以改善机械性能

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摘要

In the present study, attempts were made to fabricate cemented carbide (WC/Co) composites toughed with cubic boron nitride (cBN) for structural applications using a field assisted sintering technique. The effects of the content of cBN and the soaking time during the sintering process on the consolidation and mechanical performance of the materials were studied. It was found that with the increase of the cBN content from 0 to 30vol%, the densification of the composites was hindered and relative density decreased from 99.5% to 92.18%. Phase transformation of the cBN to the hexagonal structure was related to the content of cBN due to the joule heat generated in the interface and tended to occur when a cBN content higher than 5vol% was incorporated and sintered for more than 8 min. Both the hardness and toughness showed considerable improvements with an introduction of 5 vol% cBN and continuous decrease with its further addition. A maximum enhancement of around 12% and 20% were achieved for the hardness and toughness respectively. A long period sintering degraded the mechanical performances of the cBN-WC/Co composites by forming the pores or holes and promoting the phase transformation of the cBN. The results obtained are expected to lay a foundation for the fast fabrication of high performance structural materials.
机译：在本研究中，尝试使用现场辅助烧结技术制造用立方氮化硼（CBN）来制造粘合的硬质合金（WC / CO）复合材料，用于使用场辅助烧结技术。研究了CBN含量和浸泡时间在烧结过程中对材料的固结和机械性能的影响。发现，随着CBN含量的增加，复合材料的致密化受阻，相对密度从99.5％降至92.18％。 CBN对六边形结构的相变与CBN的含量有关，由于界面中产生的焦耳热源，并且当掺入高于5Vol％的CBN含量并烧结超过8分钟时发生。硬度和韧性均显示出相当大的改善，引入5 Vol％CBN和连续减少随着其进一步添加。为硬度和韧性分别实现了大约12％和20％的最大增强。长周期烧结通过形成孔或孔并促进CBN的相变性来降低CBN-WC / CO复合材料的机械性能。所获得的结果预计将为快速制造高性能结构材料奠定基础。

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