Engineered Interfaces for Adherent Diamond Coatings on Large Thermal-Expansion Coefficient Mismatched Substrates

Adhesion of thin or thick films on substrates is a critical issue in systems where the thermal-expansion coefficients of the coating and bulk material are significantly different from each other. The large mismatch of the expansion coefficients results in the generation of very high stresses in the coating that may lead to delamination, cracking, or other deleterious effects. A method to increase the adherence of diamond coatings on tungsten-carbide and stainless steel substrates is reported based on a substrate-modification process that creates a three-dimensional thermally and compositionally graded interface. Scratch and indentation tests on diamond-coated steel and tungsten-carbide samples did not exhibit film fracture at the interface and concomitant catastrophic propagation of interfacial cracks.

[1]  R. Messier,et al.  The effect of carbon ion implantation on the nucleation of diamond on Ti-6Al-4V alloy , 1992 .

[2]  J. Hutchinson,et al.  Diamond Coating of Titanium Alloys , 1994, Science.

[3]  D. K. Reinhard,et al.  Adhesion of polycrystalline diamond thin films on single‐crystal silicon substrates , 1991 .

[4]  K. E. Spear.  Diamond—Ceramic Coating of the Future , 1989 .

[5]  M. Nesladek,et al.  Investigation of the CVD diamond-intermediate layer-steel interface , 1994 .

[6]  P. Holloway,et al.  Low‐pressure, low‐temperature, and remote‐plasma deposition of diamond thin films from water‐methanol mixtures , 1992 .

[7]  J. Chory,et al.  A Role for Brassinosteroids in Light-Dependent Development of Arabidopsis , 1996, Science.

[8]  P. Chalker,et al.  A review of the methods for the evaluation of coating-substrate adhesion , 1991 .

[9]  T. Furtak,et al.  Growth of diamond films on stainless steel , 1992 .

[10]  R. Ramesham,et al.  Selective growth of polycrystalline diamond thin films on a variety of substrates using selective damaging by ultrasonic agitation , 1992 .

[11]  D. T. Quinto,et al.  Techniques for evaluating mechanical properties of hard coatings , 1985 .

[12]  Anthony G. Evans,et al.  Surfaces and Interfaces in Ceramic and Ceramic ― Metal Systems , 1981 .

[13]  Narayan,et al.  Pulsed-laser evaporation technique for deposition of thin films: Physics and theoretical model. , 1990, Physical review. B, Condensed matter.

[14]  N. Everitt,et al.  Deposition of diamond films on sapphire: studies of interfacial properties and patterning techniques , 1994 .