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首页> 外文会议>Materials science and technology VII >Effects of Sintering Time and Atmosphere on Mechanical Properties of Injection Molded Tungsten Alloy
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Effects of Sintering Time and Atmosphere on Mechanical Properties of Injection Molded Tungsten Alloy

机译：烧结时间和气氛对注射成型钨合金力学性能的影响

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摘要

Tungsten is a promising refractory metal suitable for applications in which wear resistance, thermal stability and high weight are needed. In this work, the tungsten feedstock (94wt%W with balance of Ni-Cu-Co alloy) was used to form tensile test specimens by using metal injection molding (MIM) process. The molded specimens were debinded by catalytic debinding technique to convert to the brown specimens. After debinding, the brown parts were sintered under vacuum atmosphere (10~(-5) bar) with varied sintering times at sintering temperature from 1350 to 1450℃. The specimens sintered at 1450℃ for 3 hours provided optimum sintered density and mechanical properties. The results showed that mechanical properties of the specimens sintered at 1450℃ dramatically decreased when sintering times were longer than 3 hours. The specimens sintered at 1450℃ for 8 hours showed brittleness. Physically, inferior mechanical properties were attributed to wettability and porosity of the binder phase. Chemical analyses were performed with the sintered W-(Ni-Cu-Co) specimens by using energy dispersive spectroscopy with mode of quantitative analysis. The specimens sintered at 1400℃ for 3 hours showed high W content (28.95 wt. %) dissolved in the Ni-Cu-Co binder. However, penetration of the liquid binder was incomplete. The specimens sintered at 1450℃ for 3 hours showed higher W content (34.28 wt. %) dissolved in the Ni-Cu-Co binder (with lower Cu content). Distribution of Cu was uniform across the whole specimen. Wetting of the liquid binder on W grains was complete without porosity. The specimens sintered at 1450℃ for longer than 3 hours showed less W content (< 28.95 wt. %) dissolved in the Cu-depleted Ni-Co binder. Porosity was observed in the binder phase and in W grains. Sintering between W grains was also observed. Effects of different sintering atmospheres were also investigated. It was found that increasing the sintering chamber pressure caused detrimental effects on both physical and mechanical properties of the sintered tungsten specimens. In addition, nitrogen atmosphere gave similar results to those for increased chamber pressure.
机译：钨是一种有前途的耐火金属，适用于需要耐磨性，热稳定性和高重量的应用。在这项工作中，钨原料（94wt％W，其余为Ni-Cu-Co合金）通过金属注射成型（MIM）工艺用于形成拉伸试样。通过催化脱脂技术将模制的样品脱粘以转化为棕色样品。脱脂后，将棕色零件在真空气氛下（10〜（-5）bar）烧结，烧结时间为1350至1450℃，烧结时间不同。在1450℃烧结3小时的试样提供了最佳的烧结密度和机械性能。结果表明，当烧结时间超过3小时时，在1450℃烧结的试样的力学性能急剧下降。在1450℃下烧结8小时的试样显示出脆性。在物理上，较差的机械性能归因于粘合剂相的润湿性和孔隙率。使用能量色散光谱和定量分析模式对烧结的W-（Ni-Cu-Co）样品进行化学分析。在1400℃下烧结3小时的样品显示出高的W含量（28.95重量％）溶解在Ni-Cu-Co粘合剂中。但是，液体粘合剂的渗透不完全。在1450℃烧结3小时的样品显示出较高的W含量（34.28 wt。％）溶解在Ni-Cu-Co粘结剂中（Cu含量较低）。 Cu在整个试样上的分布是均匀的。液体粘合剂在W晶粒上的润湿完全，没有孔隙。在1450℃下烧结超过3小时的样品显示出较少的W含量（<28.95 wt。％）溶解在贫Cu-Ni-Co粘结剂中。在粘合剂相和W晶粒中观察到孔隙率。还观察到W晶粒之间的烧结。还研究了不同烧结气氛的影响。发现增加烧结室压力对烧结的钨样品的物理和机械性能均造成有害影响。此外，氮气气氛与增加腔室压力的结果相似。

著录项

  • 来源
  • 会议地点 Bangkok(TH)
  • 作者

    Jittrabhanu Lamlerttham; Pongsak Wila; Monnapas Morakotjinda; Rungtip Krataitong; Bhanu Vetayanukul; Ruangdaj Tongsri; Jaruwat Charoensuk; Yoshio Saito;

  • 作者单位

    Automotive Engineering, International College, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand;

    Powder Metallurgy Research and Development Unit, Nation Metal and Materials Technology Center, 114 Paholyothin Road, Klong 1, Klong Luang, Pathum Thani,12120 Thailand;

    Powder Metallurgy Research and Development Unit, Nation Metal and Materials Technology Center, 114 Paholyothin Road, Klong 1, Klong Luang, Pathum Thani,12120 Thailand;

    Powder Metallurgy Research and Development Unit, Nation Metal and Materials Technology Center, 114 Paholyothin Road, Klong 1, Klong Luang, Pathum Thani,12120 Thailand;

    Powder Metallurgy Research and Development Unit, Nation Metal and Materials Technology Center, 114 Paholyothin Road, Klong 1, Klong Luang, Pathum Thani,12120 Thailand;

    Powder Metallurgy Research and Development Unit, Nation Metal and Materials Technology Center, 114 Paholyothin Road, Klong 1, Klong Luang, Pathum Thani,12120 Thailand;

    Department of Mechanical Engineering, Faculty of Engineering,King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand;

    Tokyo Institute of Technology, Tokyo, Japan;

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

    MIM; tungsten; sintering time and atmosphere;

    机译：MIM;钨烧结时间和气氛;

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