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Diamond vacuum brazing process
At present, most of the single-layer diamond abrasive tools used in the industry are electroplated products. Since there is no strong metallurgical chemical bond between the bonding interface between the coating metal and the substrate and the abrasive, the abrasive is only mechanically embedded in the coating metal, so the holding force is not large. In the high-efficiency grinding operation with heavy load, the abrasive tool is prone to overall failure due to the falling off of abrasive particles or the peeling of the coating layer. In order to increase the holding force, the thickness of the coating layer must be increased. As a result, the exposed height of the abrasive particles and the chip space are reduced. , the grinding wheel is easy to block.
The high-temperature vacuum brazing process can realize chemical metallurgical bonding on the interface of diamond, bonding agent (brazing alloy material) and metal matrix, with high bonding strength, and the exposed height of abrasive grains can reach 70%-80%, so brazing grinding wheel Sharp, large chip space, not easy to block, more full use of abrasive. Under the same conditions as electroplated grinding wheels, the grinding force, power consumption and grinding temperature are lower.
Because the single-layer high-temperature brazed diamond grinding wheel has obvious technical advantages, it will become a replacement product of the traditional electroplated grinding wheel in the future industrial production practice, and it is of great significance for energy saving and environmental protection, and will produce huge social and economic benefits. Diamond has high interfacial energy with general metals and alloys, and cannot be wetted by general low-melting alloys, resulting in poor weldability. The study found that A1, Fe, Co can infiltrate diamond in liquid state, but at the temperature where they can infiltrate, they all seriously corrode diamond.
Vacuum Brazing Process
The base material is 45 steel, and the brazing filler metal is Cu2Sn2Ti alloy.
The diamond in brazing has no coating, the grain size is 45/50 mesh, and it is evenly arranged on the alloy brazing filler metal. Degrease the steel substrate and diamond surface before brazing. The brazing test is carried out under vacuum conditions, the brazing temperature is about 30°C higher than the melting point, and the temperature is kept warm.
After a certain period of time, cool down to room temperature with the furnace.
Compressive shear strength test method: under vacuum conditions, heat up 10 ° C/min during brazing, hold for 20 min, and then cool with the furnace. The descending speed of the indenter is: 1mm/min. The strength test results are shown in the table below.
The strength of the solder alloy increases with the increase of the titanium content. During the test, the fracture occurs on the bonding surface of the polycrystalline sheet and the solder. After part of the fracture, a layer of fine diamonds is distributed on the surface of the solder. Diamond is the diamond powder in the poly wafer, that is to say, the fracture occurs between the diamond powder in the poly wafer and the filler. In the actual production and use process, the strength of the solder may be greater than the current test results.
Cu-Sn-Ti alloy is an ideal binder. The liquid phase alloy completely wets diamond at high temperature; it has sufficient bonding force for diamond; and Ti can react with C to form TiC, and the brazing filler metal and diamond form metallurgy combine.
(1) The single-layer diamond is brazed with an alloy brazing filler metal containing a strong carbide-forming element Ti. The brazing filler metal has good wettability to the diamond, and the carbide-forming elements are segregated on the surface of the diamond, resulting in the formation between the diamond and the brazing filler metal and the matrix. The chemical metallurgical bonding improves the holding force of the matrix to the diamond.
(2) High-strength bonding of copper-based solder and steel matrix after brazing.
(3) The best brazing process for B5 is 880°C~900°C, and the process requirements can be met within 10min~15min.
Selection of vacuum brazing furnace equipment: The diamond vacuum brazing furnace produced by SIMUWU is a high-quality product for the vacuum brazing process of diamond tools, grinding wheels, saw blades, drilling tools and other tools, with good temperature control accuracy and temperature control uniformity to ensure Effectively carry out the vacuum brazing process. SIMUWU specializes in the manufacture of vacuum furnaces, has more than ten years of relevant experience, and has a good reputation in the field of vacuum furnace manufacturing. The product line includes vacuum air quenching furnace, vacuum oil quenching furnace, vacuum tempering furnace, etc., which are widely sold in developed and developing countries.
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