Method for preparing cermet using powder stock
A technology for cermets and powder raw materials, which is applied in the field of preparing cermets from powder raw materials, can solve problems such as inability to obtain cermet products, and achieve the effects of low raw material cost, good infiltration effect and simple process
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Embodiment 1
[0026] Mix titanium powder and graphite powder evenly at a molar ratio of 1:1, put 65g into a centrifuge barrel (φ65×80mm), and start the centrifuge, use a tungsten wire to ignite the combustion reaction of titanium and carbon, as shown in Figure 1a . After cooling to room temperature, the thermite (Al and Fe) mixed with aluminum powder and ferric oxide is charged 2 o 3 The molar ratio is 2: 1) 220g, start the centrifuge again to reach the above-mentioned rotating speed, also ignite the combustion reaction of the mixed powder with tungsten wire, as shown in Figure 1b. After cooling to room temperature, it is taken out from the mold cylinder, and the aluminum oxide layer on the inner surface is removed to obtain a cermet ring with titanium carbide as the ceramic phase and iron as the bonding phase. Alternatively, the aluminum oxide layer may not be removed, and it is used in conditions where both the inner and outer surfaces are subject to wear.
Embodiment 2
[0028] The total amount of mixed powder in the second step is 166g, of which 108g (65%) of thermite and 58g (35%) of iron powder. Other conditions are the same as in Example 1, and the cermet ring as in Example 1 can also be obtained.
Embodiment 3
[0030]Mix titanium powder and graphite powder in a molar ratio of 1:1, and then mix iron powder according to the mass ratio (Ti+C):Fe=1:1, weigh 10g and press it into a cylindrical billet with a diameter of 20mm, and ignite it with a tungsten wire to synthesize a TiC preform. Shaped body. After cooling, as shown in Figure 2, the TiC preform is packed into the radial centrifuge mold, and then the thermite (Al and Fe mixed with aluminum powder and ferric oxide powder) is loaded into the mold. 3 o 4 The molar ratio is 8:3) 120g. After starting the centrifuge, ignite the above-mentioned thermite with a tungsten wire. After cooling to room temperature, take it out from the mold, remove the aluminum oxide layer on the surface, and obtain a cermet with titanium carbide as the ceramic phase and iron as the bonding phase.
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Abstract
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