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首页> 外文期刊>Materials science forum >Effects of Powder Microscopic Defects on Densification and Mechanical Properties of WC via Spark Plasma Sintering
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Effects of Powder Microscopic Defects on Densification and Mechanical Properties of WC via Spark Plasma Sintering

机译：粉末微观缺陷对VIA通过火花等离子烧结致致密化和力学性能的影响

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摘要

The WC composite powder was synthesized by a new specific chemical activation technique. A large number of lattice defects such as surface humps, dislocations and stacking fault exist in the surface of the WC powder after chemical activation technique. By using such activated WC powder, the binderless WC cemented carbide with high density (15.54 g/cm~3), super hardness (average 26.29 GPa) and excellent fracture toughness (8.9 MPa.m~(1/2)) can be fabricated by SPS at 1700°C and 50 MPa pressure. The improvement in density, hardness and fracture toughness are respectively 4.5%, 15.3% and 17.1% compared to when using the original WC powder. This improvement is because microscopic defects on the surface of the WC powder can greatly improve surface free energy of the powder, which improves the sintering activity and reduces the sintering temperature of the WC powder.
机译：通过一种新的特定化学活化技术合成WC复合粉末。化学激活技术后，WC粉末的表面存在大量晶格缺陷，如表面驼峰，脱位和堆叠故障。通过使用这种活化的WC粉末，具有高密度（15.54g / cm〜3），超硬（平均26.29GPa）和优异的断裂韧性（8.9MPa.m〜（1/2）），粘合剂WC硬质合金通过SPS在1700°C和50 MPa压力下。与使用原始WC粉末相比，密度，硬度和断裂韧性的提高分别为4.5％，15.3％和17.1％。这种改进是因为WC粉末表面上的微观缺陷可以大大改善粉末的表面自由能，这改善了烧结活性并降低了WC粉末的烧结温度。

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  • 来源
    《Materials science forum》 |2021年第2期|1770-1777|共8页
  • 作者

    Liu Zhu; Jinfang Wang; Zhibiao Tu; Na Xue; Weiwei Li;

  • 作者单位

    School of Pharmaceutical and Materials Engineering Taizhou University Taizhou 318000 China Department of Materials Loughborough University Loughborough LE11 3TU UK Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou 318000 China;

    School of Pharmaceutical and Materials Engineering Taizhou University Taizhou 318000 China Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou 318000 China;

    School of Pharmaceutical and Materials Engineering Taizhou University Taizhou 318000 China Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou 318000 China;

    School of Pharmaceutical and Materials Engineering Taizhou University Taizhou 318000 China Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou 318000 China;

    School of Pharmaceutical and Materials Engineering Taizhou University Taizhou 318000 China Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou 318000 China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Tungsten carbide; Microscopic defects; Binderless cemented carbide; Spark plasma sintering;

    机译：碳化钨;微观缺陷;无粘合剂硬质合金;火花血浆烧结;

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