diamond thick welding tool

Welding tools diamond thick film production process generally include: a large area diamond films prepared; the diamond film is cut into desired shape and size of the tool; diamond thick film and the masonry drill bits  base material of the welding tool; diamond thick cutting edge grinding and polishing . (1) Preparation and cutting diamond filmsCommonly used process for preparing diamond films is a DC plasma jet CVD method. The diamond deposition to the WC-Co alloy (mirror surface processing), the cooling process of the substrate, the diamond film off automatically. This method is fast deposition rate (up to 930μm / h), relatively close integration between the lattice, but the growth surface rough. Diamond film hardness, wear resistance, non-conductive determines its cutting method is laser cutting (cutting in air, oxygen and argon environment). Use of laser cutting diamond films can not only cut to the desired shape and size, the tool can also be cut out after a corner, with a  diamond bandsaw blades narrow kerf, efficient and so on.(1) diamond tools, welding thickDiamond and metals and their alloys in general the interfacial energy between the high, resulting in the diamond can not be a general low-melting alloy infiltration, poor solderability. At present, copper-silver alloy solder by adding strong carbide forming elements, or through the diamond surface treatment of metal to increase between the diamond and the metal weldability.① active brazing methodSolder is generally used copper and silver alloy containing Ti, without flux in an inert gas or in vacuum soldering. Commonly used solder composition Ag = 68.8wt%, Cu = 26.7wt%, Ti = 4.5wt%, commonly prepared by arc melting method and the powder metallurgy method. Ti as an active element in the welding process and the C-reactive generate TiC, the diamond can improve the wettability with solder and adhesive strength. The heating temperature is generally 850 ℃, heat for 10 minutes, slow cooling to reduce internal stress.② After the concrete cutting blade  welding surface metallizationThe diamond surface of the metal surface treatment is performed by metal plating the surface of the diamond, to the surface of a metal or metalloid performance. Generally in the diamond coated Ti, Ti reacts with C TiC, TiC and Ag-Cu solder alloy has a good wettability and bonding strength. Titanium currently used methods are: a vacuum physical vapor deposition (PVD, including vacuum evaporation plating, vacuum sputtering, vacuum ion plating, etc.), chemical vapor plating and powder sintering coverage. Single plating PVD method is low, diamond plating process temperature below 500 ℃, the diamond coating and the physical attachment between, no chemical metallurgy. CVD method, a chemical reaction between Ti and diamonds form a strong metallurgical bond, the reaction temperature is high, damage to the diamond.