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Pack cementation diffusion coatings

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Metallurgical and Ceramic Protective Coatings

Abstract

Pack cementation is an in situ chemical vapor deposition (CVD) batch process that has been used to produce corrosion- and wear-resistant coatings on inexpensive or otherwise inadequate substrates for over 75 years [1]. The traditional pack consists of four components: the substrate or parts to be coated; the masteralloy (i.e. a powder of the element or elements to be deposited on the surface of the parts, such as Cr and/or AI, Cr and/or Si); a halide salt activator or energizer (e.g. NaCl, NaF, NH4C1, etc.); and a relatively inert filler powder (e.g. Al2O3, SiO2, or SiC). The masteralloy powder, the halide salt activator, and the inert filler are mixed thoroughly, and the parts to be coated are buried in this mixture within a heat-resistant retort. Commercially, inversely stacked Inconel boxes are used as the retort. Inversely stacking the boxes creates pathways for the inert carrier gas. Depending on the size of the parts to be coated, the retort size ranges from small boxes approximately 35 cm × 35 cm × 35 cm to larger boxes approximately 90 cm × 90 cm × 50 cm. As an inlet for the carrier gas, an Inconel tube is attached to the outer box of the retort. The assembled retort is then sealed with fusible silicate. Experimentally, a cylinder of commercially pure alumina (Al2O3) with one end closed is used as the retort. The alumina retort size ranges from small cylinders approximately 5 cm outer diameter by 10 cm long to larger cylinders approximately 10 cm outer diameter by 20 cm long.

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Authors
  1. Robert Bianco
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  2. Robert A. Rapp
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Editors and Affiliations

  1. Chemistry Division, Naval Research Laboratory, 20375-5342, Washington D.C., USA

    Kurt H. Stern

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Bianco, R., Rapp, R.A. (1996). Pack cementation diffusion coatings. In: Stern, K.H. (eds) Metallurgical and Ceramic Protective Coatings. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1501-5_9

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  • DOI: https://doi.org/10.1007/978-94-009-1501-5_9

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-7171-0

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