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Ceramic metal welding process

by:J&D WATER     2020-03-17
In the welding of ceramic and metal ceramic basically refers to the human will be all kinds of metal, such as oxygen, nitrogen, carbon synthesis of a new type of ceramic. It has high strength, high temperature resistant, wear resistance, corrosion resistance, super hardness features, and is widely used; Commonly used with alumina, silicon nitride, zirconia ceramics, etc. The difficulties of ceramic and metal welding 1, small linear expansion coefficient of the ceramic, and the linear expansion coefficient of metal is relatively large, lead to meet easy craze. General to well deal with metal layer of the thermal stress problem. 2, low thermal conductivity of the ceramic itself, it is weak to heat shock. Minimize welding parts during welding and the surrounding temperature gradient, control the cooling rate after welding. 3, most of the ceramic electric conductivity is poor, not even the conductive, it is difficult to use the method of welding. This process need to take special measures. 4, due to the ceramic material has the stable electronic ligand, metal and ceramics is unlikely. Needs to undertake processing of ceramic metallization or active brazing filler metals. 5, as a result of ceramic material are covalent crystals, not easy to deformation and brittle fracture often occur. Now mostly use the middle layer to reduce the welding temperature, indirect diffusion method for welding. 6, ceramic and metal welding structure design with normal welding, is usually divided into flat seal structure, the structure of the sleeve, needle seal structure and seal structure, the effect is the most one set of sealing structure. Well, the requirements of making the joint structure is very high. Ceramic and metal welding craft of gm 1, cleaning: metals and solder surface must be clean, ceramic commonly used detergent and ultrasonic cleaning. 2, paste: paste is mostly made of pure metal powder and the appropriate composition of metal oxide powder, particle degree between 1 ~ 5 um, mostly made with organic binder tuning has certain viscosity paste. Then use the paint tool will paste evenly on the ceramic to metal surface, the coating thickness generally is 30 ~ 60 um. 3, metallization: good will apply ointment pseudo ceramic furnace into hydrogen, under the temperature of 1300 ~ 1500 ℃ heat preservation for 1 h. 4, the nickel plating: in order to better solder wetting, again on metallized layer a 5 um thick layer of nickel plating layer. When the brazing temperature below 1000 ℃, the plating still need in 1000 ℃ hydrogen furnace presintering 15 ~ 20 min. 5, rack, deal with the good metal and ceramic parts with stainless steel, graphite, ceramic mold assembly as a whole, and mount soldering on the joint section; In the entire operation process for welding parts should be kept clean, shall not touch with bare hands. 6, brazing: in general in the furnace of argon gas in the furnace of hydrogen on or in a vacuum furnace brazing, its temperature, heating speed selection according to the solder used by nature, to pay special attention to, is not too fast cooling speed, in order to prevent the TaoJiao cracking due to thermal stress. 7, after welding inspection: after ceramic and metal welding, first of all, the naked eye after qualified, according to the technical documentation required to make the necessary testing. Laser welding equipment recommendation: preferential deals offer 4007001618 【 Metal laser welding equipment 】 Suitable for all kinds of complex welding, the welding of different equipment and 1 mm thick seam welding; Multi-channel fiber optic mode, welding transfer at the same time; 【 Mould laser welding equipment 】 Applicable mould industrialized, used for precision mold repair, such as digital products, mobile phones, toys, automobile, motorcycle, mold and other mold manufacturing and molding industry. 【 Gold and silver jewelry laser welding 】 Mainly used in jewelry, such as electronics, communications, handicrafts and other industries; 【 Large laser welding 】 Application in automobile body covering parts of compound, such as car door, side wai, window, floor, warehouse, the warehouse before, trunk lid. 【 Automatic laser welding machine 】 Using numerical control software by moving or rotating workpiece computer control of mechanical system, so as to realize automatic welding 【 The laser spot welder 】 Can be used for jewelry, watches and clocks hairspring, integrated circuit lead all kinds of small, precise welding of heat sensitive parts of the YAG laser welding machine 】 High compactness, and strong weld, precise control, high power density, deep and narrow welds, beautiful welding seam characteristics such as more metal welding metal ceramic laser welding equipment welding
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