1. Through the application research of electroless coated diamond on the iron-based saw blade, it is proved by the measured data and application effect that after the surface of the Ni-Co-W diamond is metallized, the carbide does not grow on the graphite, and the adhesion The joint strength was 28.8% higher than the final diamond plating. At the same time, it is pointed out that: 1) The surface metallized diamond by low temperature deposition method improves the high temperature resistance of diamond, and the thermal loss and strength of diamond decrease with the increase of temperature. For example, 850 degrees, 950 degrees, 1050 degrees of un-plated diamond weight loss are: 0.5, 1.1, 2.5 carats, strength 80N, 60N, 50N; the weight loss of Ni-Co-W film diamond under the same conditions is: 0.075 , 0.15, 0.065 carats, strength 167N, 106N, 104N; 2) improved metal carcass and diamond bonding ability. The tensile ring method was used for the measurement. The un-plated carcass tensile load was 5900 N, and the low-temperature deposited Ni-Co-W diamond carcass tensile load was 7600 N.
The coated diamond tool has less diamond drop and the diamond concentration can be reduced by about 10%. The effect is obvious. The life of cut-off white granite is increased by 27.5%, the red hard granite is cut, the service life is increased by 36.8%, and no special equipment and equipment are needed. The cost is low, and it is easy to launch, and the technical and economic benefits are remarkable.
It is beneficial to form carbides on the diamond surface in that way, since the compatibility of metals and carbides is much better than that of metals and diamonds. In other words, the adhesion of the metal to the carbide is much higher than the adhesion of the metal to the diamond. If there is an easily oxidizable metal outside the carbide layer, and the oxide free energy of the metal is very low, it is difficult to reduce, which will have a bad influence on the powder metallurgical quality of the tool. In order to prevent oxidation of difficult-reducing metals, the following effective measures can be taken:
1) Immediately after the formation of carbide on the diamond surface, do not leave it in the air for a long time to oxidize or store it in an anaerobic state.
2) Immediately after the formation of carbides on the diamond surface or the deposition of char forming elements on the diamond surface, a layer of easily reductive metals such as Cu, Ni, etc., is plated. Once the surface layer is oxidized, it can be used together with the powder of the plated metal for reduction.
2. The mixed powder rich in carbide forming elements is uniformly mixed with diamond and then sintered under the atmosphere with a graphite abrasive to form carbides on the surface of the diamond.
The carbide-forming element is mechanically coated on the surface of the diamond in a state of sufficient reduction, and then mixed with the carcass powder to form carbides.
This method is relatively simple, low in equipment cost, and can prevent excessive diamond intensiveness and reduce diamond shedding. The metal used for coating may be Cr, TiH2, W or the like. Tungsten powder is recommended because tungsten has unique useful properties.
In the diamond tool, except for Al, the common elements have no specific gravity than the diamond. Due to the difference in specific gravity, when the diamond matrix metal powder is mixed and stirred, the specific gravity segregation is likely to occur, and the diamond is unevenly distributed in the carcass. If a certain amount of tungsten powder is coated on the surface of the diamond, the diamond specific gravity of the tungsten-coated powder can be increased, and the specific gravity of the mixed powder of the carcass is easy to be uniform.
Tungsten acts as a bond between the diamond and the carcass powder, because the affinity of tungsten for diamond is greater than the affinity of the bonded metal for diamond, and the affinity of the bonded metal to tungsten is also good. In other words, the bonded metal can be well hydrated. Wet tungsten and tungsten carbide strengthen the connection between the diamond-tungsten-titanium metal.
The coated diamond tool has less diamond drop and the diamond concentration can be reduced by about 10%. The effect is obvious. The life of cut-off white granite is increased by 27.5%, the red hard granite is cut, the service life is increased by 36.8%, and no special equipment and equipment are needed. The cost is low, and it is easy to launch, and the technical and economic benefits are remarkable.
It is beneficial to form carbides on the diamond surface in that way, since the compatibility of metals and carbides is much better than that of metals and diamonds. In other words, the adhesion of the metal to the carbide is much higher than the adhesion of the metal to the diamond. If there is an easily oxidizable metal outside the carbide layer, and the oxide free energy of the metal is very low, it is difficult to reduce, which will have a bad influence on the powder metallurgical quality of the tool. In order to prevent oxidation of difficult-reducing metals, the following effective measures can be taken:
1) Immediately after the formation of carbide on the diamond surface, do not leave it in the air for a long time to oxidize or store it in an anaerobic state.
2) Immediately after the formation of carbides on the diamond surface or the deposition of char forming elements on the diamond surface, a layer of easily reductive metals such as Cu, Ni, etc., is plated. Once the surface layer is oxidized, it can be used together with the powder of the plated metal for reduction.
2. The mixed powder rich in carbide forming elements is uniformly mixed with diamond and then sintered under the atmosphere with a graphite abrasive to form carbides on the surface of the diamond.
The carbide-forming element is mechanically coated on the surface of the diamond in a state of sufficient reduction, and then mixed with the carcass powder to form carbides.
This method is relatively simple, low in equipment cost, and can prevent excessive diamond intensiveness and reduce diamond shedding. The metal used for coating may be Cr, TiH2, W or the like. Tungsten powder is recommended because tungsten has unique useful properties.
In the diamond tool, except for Al, the common elements have no specific gravity than the diamond. Due to the difference in specific gravity, when the diamond matrix metal powder is mixed and stirred, the specific gravity segregation is likely to occur, and the diamond is unevenly distributed in the carcass. If a certain amount of tungsten powder is coated on the surface of the diamond, the diamond specific gravity of the tungsten-coated powder can be increased, and the specific gravity of the mixed powder of the carcass is easy to be uniform.
Tungsten acts as a bond between the diamond and the carcass powder, because the affinity of tungsten for diamond is greater than the affinity of the bonded metal for diamond, and the affinity of the bonded metal to tungsten is also good. In other words, the bonded metal can be well hydrated. Wet tungsten and tungsten carbide strengthen the connection between the diamond-tungsten-titanium metal.
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