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<p>The wear and corrosion of the screws in the plasticizing unit for injection molding machine is a significant issue. WC composite coatings were sprayed using the high-velocity oxygen fuel spraying technique. WC composite coatings were composed of WC phase with a little amount of W<sub>2</sub>C phase. WC-10Co-4Cr coating consisted of a small amount of Co<sub>3</sub>W<sub>3</sub>C, W<sub>2</sub>C, and CoCr phases, while WC-20Cr<sub>3</sub>C<sub>2</sub>-7Ni coating comprised Cr<sub>3</sub>C<sub>2</sub>, (W, Cr)<sub>2</sub>C and Ni phases. The microhardness of WC composite coatings with a binder of Co, Co-Cr and Ni was 1266.0 ± 107.7 HV<sub>0.3</sub>, 1208.0 ± 96.3 HV<sub>0.3</sub>, and 1186.1 ± 113.4 HV<sub>0.3</sub>, respectively. The wear resistance of the coatings was in the order: WC-12Co &gt; WC-10Co-4Cr &gt; WC-20Cr<sub>3</sub>C<sub>2</sub>-7Ni coatings at 25&#xa0;°C, and WC-20Cr<sub>3</sub>C<sub>2</sub>-7Ni &gt; WC-12Co &gt; WC-10Co-4Cr coatings at 500&#xa0;°C. The wear mechanisms of the coatings are further investigated. The corrosion resistance of the coatings was ordered as WC-10Co-4Cr &gt; WC-20Cr<sub>3</sub>C<sub>2</sub>-7Ni &gt; WC-12Co coatings. In specific application environments according to the chemical composition and constituents of the polymer materials in the plasticizing units, WC composite coatings should be considered to be used as the protective layer on the screw of injection molding machines.</p>

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Wear and Corrosion Resistances of HVOF-Sprayed WC Composite Coatings for Application in Screws of Injection Molding Machines

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Wangping Wu,
  • Sheng Lin,
  • Qinqin Wang

摘要

The wear and corrosion of the screws in the plasticizing unit for injection molding machine is a significant issue. WC composite coatings were sprayed using the high-velocity oxygen fuel spraying technique. WC composite coatings were composed of WC phase with a little amount of W2C phase. WC-10Co-4Cr coating consisted of a small amount of Co3W3C, W2C, and CoCr phases, while WC-20Cr3C2-7Ni coating comprised Cr3C2, (W, Cr)2C and Ni phases. The microhardness of WC composite coatings with a binder of Co, Co-Cr and Ni was 1266.0 ± 107.7 HV0.3, 1208.0 ± 96.3 HV0.3, and 1186.1 ± 113.4 HV0.3, respectively. The wear resistance of the coatings was in the order: WC-12Co > WC-10Co-4Cr > WC-20Cr3C2-7Ni coatings at 25 °C, and WC-20Cr3C2-7Ni > WC-12Co > WC-10Co-4Cr coatings at 500 °C. The wear mechanisms of the coatings are further investigated. The corrosion resistance of the coatings was ordered as WC-10Co-4Cr > WC-20Cr3C2-7Ni > WC-12Co coatings. In specific application environments according to the chemical composition and constituents of the polymer materials in the plasticizing units, WC composite coatings should be considered to be used as the protective layer on the screw of injection molding machines.