Kovar alloy is a vacuum melted, iron-nickel-cobalt, low expansion alloy whose chemical composition is controlled within narrow limits to assure precise uniform thermal expansion properties. Extensive quality controls are employed in the manufacture of this alloy to ensure uniform physical and mechanical properties for ease in deep drawing, stamping and machining.QC MOLD has the experience, knowledge, and CNC equipment required to machine a wide array of materials, including Kovar.
CNC Machining Service
At QC Mold, we use advanced equipment to offer you a variety of CNC machining services including milling, turning, EDM and wire EDM, surface grinding and much more. Using our imported 3, 4 and 5-axis CNC machining centers, our skilled machinists can make turned and milled parts using a wide range of plastic and metal materials.
Whether you require a one off model for fit and function, a small batch run for marketing and testing or low volume production QiChuang has the solution for you.
We can machine virtually any engineering material, including plastics, metals and more.Whether you‘re a large corporation or a small business, we will work in a collaborative manner with you to ensure high quality.Taking your concept and turning it into reality,upload your drawings,start your free project review!
Our engineers are experts in achieving the perfect finish for your product. With painting, vapor polishing, sanding, anodizing and many other services to choose from, you can create the exact look you want.Anodizing, Painting, Pad Printing, Color Matching, Sanding and Polishing, Vapor Polishing, Blasting
Kovar alloy has been used for making hermetic seals with the harder Pyrex glasses and ceramic materials.
This alloy has found wide application in power tubes, microwave tubes, transistors and diodes. In intergrated circuits, it has been used for the flat pack and the dual-in-line package.
Preparation for Sealing:
All degreased, fabricated Kovar alloy parts should be degassed and annealed in a wet hydrogen atmosphere. Atmosphere is to be made moist by bubbling the hydrogen through water at room temperature. Care must be taken to prevent surface carbon pickup. Furnace should have a cooling chamber provided with the same atmosphere.
Heating should be conducted within the 1540/2010°F temperature range. Time at temperature should be approximately two hours for lowest temperature to 20 minutes for the highest temperature. Parts should then be transferred to the cooling zone and held until below 570°F, then removed.
An oxide film on the metallic part is preferred for metal-to-hard glass sealing. The best oxide film is thin and tightly adhering. The film can be produced by heating the parts to 1200/1290°F in regular ambient atmosphere for a time sufficient to form a dark gray to slight brown oxide.
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