Claims
- 1. A method for joining a diamond film to a tungsten carbide substrate comprising the steps of:
- (a) placing a vanadium-containing braze composition between a diamond film and a tungsten carbide substrate; and
- (b) heating the braze to a temperature sufficiently high to melt the braze and form a brazed joint between the tungsten carbide substrate and the diamond film, wherein the joint has an average shear strength of at least 40,000 psi (276 MPa) and the braze has a contact angle with the diamond film of less than 15.degree..
- 2. A method for joining a diamond film to a tungsten carbide cutting element comprising the sequential steps of:
- (a) distributing a first braze comprising vanadium on a diamond film surface, wherein the vanadium braze has a melting temperature greater than about 1100.degree. C.;
- (b) heating the first braze sufficiently high to melt the braze and form an adhesive bond to the diamond film, and cooling the diamond film;
- (c) distributing a second braze substantially on the first braze, wherein the second braze melts at a lower temperature than the first braze;
- (d) placing a tungsten carbide cutting element on the second braze;
- (e) heating the second braze sufficiently high to melt the second braze and form a brazed joint between the diamond film and the tungsten carbide cutting element;
- (f) cooling the cutting element.
- 3. The method of claim 2, wherein vanadium is present in the first braze in an amount of about 0.5 to 10 wt. % of the braze.
- 4. The method of claim 3, wherein the first braze further comprises at least about 1 wt. % vanadium, at least about 95 wt. % gold, and the balance being nickel.
- 5. The method of claim 2, wherein the diamond film is adhered to the first braze by vacuum brazing at a vacuum of greater than about 1.times.10.sup.-5 Torr.
- 6. The method of claim 2, wherein the first braze comprises a metal selected from the group consisting of titanium, tantalum, chromium, and nickel.
- 7. The method of claim 2, wherein the second braze comprises a metal selected from nickel, copper, and silver.
- 8. The method of claim 2, wherein the tungsten carbide cutting element is spaced away from the second braze by a distance of less than about 100 .mu.m.
Parent Case Info
This is a Divisional application under 37 CFR 1.60, of pending prior application Ser. No. 08/283,311 filed on Jul. 29, 1994.
US Referenced Citations (10)
Divisions (1)
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Number |
Date |
Country |
Parent |
283311 |
Jul 1994 |
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