DC Arc Plasma Treatment for Defect Reduction in WC-Co Granulated Powder

DOI Web Site 被引用文献1件 オープンアクセス
  • Hirotomo Itagaki
    Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8564, Japan
  • Taisei Yachi
    Machinery and Material Division, Industrial Research Institute of Ishikawa, Kanazawa, Ishikawa 920-8203, Japan
  • Hisato Ogiso
    Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8564, Japan
  • Harumichi Sato
    Advanced Manufacturing Research Institute, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8564, Japan
  • Yorihiro Yamashita
    Machinery and Material Division, Industrial Research Institute of Ishikawa, Kanazawa, Ishikawa 920-8203, Japan
  • Junichi Yasuoka
    Powlex Co., Ltd, Taito-ku, Tokyo 110-0002, Japan
  • Yoshinori Funada
    Machinery and Material Division, Industrial Research Institute of Ishikawa, Kanazawa, Ishikawa 920-8203, Japan

説明

<jats:p>Tungsten carbide–cobalt (WC–Co) agglomerated powder is widely used for additive manufacturing and spray coating, and a reduction in internal gaps in the powder is required to obtain a product of high quality. In this paper, we investigate plasma effects on agglomerated powder when WC–12%Co powder is directly subjected to direct current (DC) arc plasma treatment to reduce gaps in the WC–Co powder. We obtain a plasma-treated powder with reduced gaps among WC particles. Furthermore, plasma-treatment improves the sphericity of the powder particles, due to the spheroidization effect, so that the percentage of plasma-treated particles exceeding 95% sphericity is 50%, which is 1.7 times that of raw powder. Concern regarding the possible generation of W2C by plasma treatment is unfounded, with W2C levels kept very low according to X-ray diffraction (XRD) analysis, showing a value of 0.0075 for the area ratio W2C(002)/WC(100). XRD analysis also reveals that plasma treatment relaxes residual strains in the powder. From these results, the DC plasma treatment of WC agglomerated powder produces a spherical powder with fewer gaps and strains in the powder, making it more suitable for additive manufacturing while suppressing decarburization.</jats:p>

収録刊行物

  • Metals

    Metals 10 (7), 975-, 2020-07-20

    MDPI AG

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