Ford Motor Company Limited

Qqc, Inc.

Robert Corbly, Jr. Mccune

William R Drawl

Robert C McCune

Manuel C Turchan

Rustum N Roy

Pravin Mistry

Andrzej R Badzian

Theresa Badzian

Jr Mccune Robert Corbly

A diamond coating formed on a WC&mdash;Co substrate prepared through a process including employing a plasma and a variety of interactions from a multiple laser system demonstrates exceptional adhesion and indicates a durable cubic diamond structure. The coating on the WC&mdash;Co substrate is typically between 25 and 40 &mgr;m thick and has an average crystal size of between 10 and 20 &mgr;m. Various methods of confirming the cubic diamond structure of the coatings have been employed. The adhesion of the diamond coating to the substrate is very strong. An electron microprobe analysis shows tungsten and cobalt atoms incorporated into the film and a layer depleted in cobalt exists at the diamond-WC&mdash;Co interface. Particulates of WC&mdash;Co&mdash;C alloy are spread over the top surface, apparently formed by condensation from the vapor phase of metal-containing molecules. Carbon is confirmed as being the main component of the surface layer.

Diamond coatings deposited on WC-Co substrate by multiple laser

The preparation and use of diamond as an electron emission material is disclosed. Satisfactory measurements were conducted on diamond coatings deposited on WC-Co alloy by a multiple pulsed laser process. The electron emission was measured in a diode configuration with a diamond surface-anode spacing of 20 and 50 &mgr;m in vacuum at P&equals;10,Torr. Current densities of 6 mA/cm were calculated at an applied of voltage of 3000 V (for 20 &mgr;m). Analysis proved that electron field emission provided by a diamond grown by a multiple pulsed laser process proved to satisfactorily meet the specified demands.

Application of electron field emission from diamond grown by a multiple pulsed laser process

Method of toughening the structure of a diamond or diamond-like coated tool, by the steps of: (a) depositing, by low pressure CVD, a plurality of layers of separated diamond or diamond-like particles onto a nondiamond or nondiamond-like tool substrate (i.e., SiAlON, Si.sub.3 N.sub.4, SiC, Si, Ti, Co cemented WC, TiC, Ni-Mo cemented TiCN), the substrate being selected to facilitate diamond or diamond-like deposition and to retain its strength-related properties after such CVD; and (b) interposing a mechanically adherent, planarized binding material (i.e. transition metals, silicon, boron) between and on said layers of particles and across the separated particles of each particle layer, said binding material being substantially devoid of diamond graphitizing or dissolution agents. A barrier layer is deposited onto said tool substrate prior to step (a) to prevent the egress of chemicals capable of graphitizing diamond or diamond-like particles. The total thickness of the coating structure is about 50-125 microns.

Method of toughening diamond coated tools

Growing community of inventors

State College, PA, United States of America

William R Drawl