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Development of Ceramic Items Injection Moulding Technology Using Computer Modeling

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Powder Metallurgy and Metal Ceramics Aims and scope

Research projects in foreign materials science were analyzed. Specific technological methods for forming ceramic items were examined. The study presents a facility for injection molding of thermoplastic items based on ceramic and metal-ceramic powders developed at Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine. The heat transfer process during injection molding of a nozzle and the ball with an axial cylindrical hole, ring, and solid ball formed from ceramic materials based on powders of aluminum nitride, tungsten carbide, and silicon has been computer-modeled. Danger areas of local isothermal concentrations in molds have been identified. It has been established that the cooling time of thermoplastic mass in molds to reach the binder solidification temperature depends on the type of material to be injected. The pattern of the furnace temperature change to provide uniform heating of a cast product at the debinding stage was calculated. A sample of the temperature change patterns calculated during binder sublimation from a ball-shaped product of different sizes was presented. The process of mold filling with thermoplastic mass during injection molding of ceramic items in the form of a ball with a cylindrical hole, ring, solid ball, nozzle, and funnel based on powders of aluminum nitride, tungsten carbides, and silicon has been modeled using computer-assistance tools. Pressure distributions in mold cavities and time of filling with thermoplastic mass were obtained. The optimal location of the injection hole in molds has been determined at which the weld lines length is minimum at the end of the injection. The dependencies of the mold filling time and the weld lines length at different material viscosity values on the product's dimensional parameters have been defined. The experimental part of the injection molding technology was also considered for the aluminum nitride powder nozzle at argon arc welding. The graphs of minimum injection temperature changes have been obtained, at which the defect-free nozzle blanks are formed with changing binder concentration and mass viscosity. The obtained calculated data determine the whole complex of the injection molding technological features, which can be used to produce various shapes of ceramic items.

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Authors and Affiliations

  1. Bakul Institute for Superhard Materials, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    T.O. Psiarnetska, O.O. Leshchuk & V.V. Ivzhenko

  2. Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    O.G. Kirkova & M.B. Shtern

  3. National Technical University ‘Igor Sikorsky Kyiv Polytechnic Institute’, Kyiv, Ukraine

    M.B. Shtern

Authors
  1. T.O. Psiarnetska
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  2. O.G. Kirkova
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  3. O.O. Leshchuk
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  4. M.B. Shtern
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  5. V.V. Ivzhenko
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Correspondence to T.O. Psiarnetska.

Additional information

Translated from Poroshkova Metallurgiya, Vol. 60, Nos. 3–4 (538), pp. 28–45, 2021.

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Psiarnetska, T., Kirkova, O., Leshchuk, O. et al. Development of Ceramic Items Injection Moulding Technology Using Computer Modeling. Powder Metall Met Ceram 60, 150–163 (2021). https://doi.org/10.1007/s11106-021-00223-3

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  • DOI: https://doi.org/10.1007/s11106-021-00223-3

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