Patent Application
20070237985
There are six (6) types of Titanium based alloys contemplated in present invention, for coating material to be coated to the surface of the woodworking machines' cast iron worktable. They are Titanium Nitride, TiN which appears in gold color; Titanium Aluminum Nitride, TiAlN which appears in purple black color; Titanium Carbonitride, TiCN which appears in Bluish Gray color; Dual Titanium Nitride, Ti2N which appears in silver color; Aluminum Titanium Nitride, AlTiN which appears in black color; Titanium Aluminum Carbonitride, TiAlCN which appears in red color.
PVD, Physical Vaporization Deposition, is fundamentally a vaporization coating process in which the basic mechanism is an atom by atom transfer of material from the solid phase to the vapor phase and back to the solid phase, gradually building a thin film on the surface to be coated.
PVD process is not invented by present application, which claims no right in the PVD process per se. However, there is no prior known art that uses PVD technique to coat the Titanium based alloys to cast iron surface of a woodworking machine.
Depending on the color(s) desired as well as other inherent attributes of the selected Titanium alloy, PVD process as used in present invention will first generate the vapor phase from the six (6) types of coating material stock, then transfer the vaporized coating to the substrate (the cast iron surface) and finally forming a thickness of between 1-5 micro mini meters (μm, or “micron”) thin but strong film of hard alloy material on the surface of cast iron worktable. This metallurgical film is chemically bonded to the cast iron substrate and will not flake, blister, chip or peel.
Although surface coating on woodworking machines is not a new thing, using PVD to coat the cast iron surface of woodworking machines becomes a desirable alternative to electroplating and possibly some painting applications. PVD can be applied using a wide variety of materials to coat an equally diverse number of substrates using any of the three basic PVD technologies to deposit a number of desired finishes of variable thickness with specific characteristics.
The application of PVD surface coating technologies at large scale, high volume operations will result in the reduction of hazardous waste generated when compared to electroplating and other metal finishing processes that use large quantities of toxic and hazardous materials.
In addition to the six Titanium based alloy stated herein, present invention can also use Chrome Nitride (CrN9) as the surface coating material, achieving substantially the same purpose of rust-prevention, scratch-resistance and increase hardness of about HV 1800. CrN9 appears in the color of silver.
