Diamond coatings on Co cemented tungsten carbide (WC-Co) hard metal tools are widely used for cutting nonferrous metals. It is difficult to deposit diamond onto cutting tools, which generally have a complex geometry, using a single step growth process. This paper focuses on the deposition of polycrystalline diamond films onto dental tools, which possess 3-D complex or cylindrical shape, employing a novel single step CVD growth process. The diamond deposition is carried out in a hot filament chemical vapour deposition (HFCVD) reactor with a modified filament arrangement. The filament is mounted vertically with the drill held concentrically in between the filament coils, as opposed to the commonly used horizontal arrangement. This is a simple and inexpensive filament arrangement. In addition, the problems associated with adhesion of diamond films on WC-Co substrates are amplified in dental tools due to the very sharp edges and unpredictable cutting forces. The presence of Co, used as a binder in hard metals, generally causes poor adhesion. The amount of metallic Co on the surface can be reduced using a two-step pre-treatment employing Murakami etching followed by an acid treatment. Diamond films are examined in terms of their growth rate, morphology, adhesion and cutting efficiency. We found that in the diamond coated dental tool the wear rate was reduced by a factor of three compared to the uncoated tool.

Sein, H., Ahmed, W., Rego, C., Jones, A., Amar, M., Jackson, M., et al. (2006). Optimising CVD diamond coating process for use on tungsten carbide dental cutting tools. In Surface Engineering: Proceedings of the 4th International Surface Engineering Conference (pp.20-28). ASM International.

Optimising CVD diamond coating process for use on tungsten carbide dental cutting tools

Polini, R
2006-01-01

Abstract

Diamond coatings on Co cemented tungsten carbide (WC-Co) hard metal tools are widely used for cutting nonferrous metals. It is difficult to deposit diamond onto cutting tools, which generally have a complex geometry, using a single step growth process. This paper focuses on the deposition of polycrystalline diamond films onto dental tools, which possess 3-D complex or cylindrical shape, employing a novel single step CVD growth process. The diamond deposition is carried out in a hot filament chemical vapour deposition (HFCVD) reactor with a modified filament arrangement. The filament is mounted vertically with the drill held concentrically in between the filament coils, as opposed to the commonly used horizontal arrangement. This is a simple and inexpensive filament arrangement. In addition, the problems associated with adhesion of diamond films on WC-Co substrates are amplified in dental tools due to the very sharp edges and unpredictable cutting forces. The presence of Co, used as a binder in hard metals, generally causes poor adhesion. The amount of metallic Co on the surface can be reduced using a two-step pre-treatment employing Murakami etching followed by an acid treatment. Diamond films are examined in terms of their growth rate, morphology, adhesion and cutting efficiency. We found that in the diamond coated dental tool the wear rate was reduced by a factor of three compared to the uncoated tool.
4th International Surface engineering Conference
St. Paul, MN
2005
ASM International
Rilevanza internazionale
Settore CHIM/03 - Chimica Generale e Inorganica
Settore ING-IND/22 - Scienza e Tecnologia dei Materiali
English
Adhesion; Chemical vapour deposition (CVD); Cutting tools; Dental tools; WC-Co; Diamond;
Intervento a convegno
Sein, H., Ahmed, W., Rego, C., Jones, A., Amar, M., Jackson, M., et al. (2006). Optimising CVD diamond coating process for use on tungsten carbide dental cutting tools. In Surface Engineering: Proceedings of the 4th International Surface Engineering Conference (pp.20-28). ASM International.
Sein, H; Ahmed, W; Rego, C; Jones, A; Amar, M; Jackson, M; Polini, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/34484
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