Preparation method of hard alloy using nickel-aluminum intermetallic compound Ni3Al as bonding phase
A technology of intermetallic compounds and cemented carbide, which is applied in the field of cemented carbide materials and its preparation, can solve problems such as the alloy is prone to produce pores, and achieve the effects of improving plasticity and toughness at room temperature, uniform structure, and fine particle size
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Embodiment 1
[0020] Embodiment 1: According to figure 1 In the process shown, according to the composition ratio of Ni-24at.%Al, mix the nickel powder and aluminum powder with a mass percentage of 5.04% and the rest of the tungsten carbide powder evenly; place the above mixed powder in a graphite container and spread it to a thickness of 50mm , in a non-oxidizing atmosphere, heated to 1100°C at a heating rate of 5°C / min, held for 7 hours, and then cooled naturally to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni 3 A mixture of Al; the mixture is ground, crushed, and passed through a 250-mesh sieve to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni with a particle size of 58 μm or less. 3 Mixed powder of Al; the above-mentioned tungsten carbide and nickel-aluminum intermetallic compound Ni 3The mixed powder of Al is subjected to deoxidation pretreatment in a hydrogen atmosphere at 400°C±50°C; then, the B powder with a mass percentage of 0.0025%...
Embodiment 2
[0021] Embodiment 2: According to figure 1 In the process shown, according to the composition ratio of Ni-24at.%Al, the mass percentage of 10.67% nickel powder and aluminum powder is mixed with the remaining tungsten carbide powder; , in a non-oxidizing atmosphere, heated to 1130 °C at a heating rate of 3 °C / min, kept for 5 hours, and then cooled naturally to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni 3 A mixture of Al; the mixture is ground, crushed, and passed through a 200-mesh sieve to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni with a particle size of less than 75 μm 3 Mixed powder of Al; the above-mentioned tungsten carbide and nickel-aluminum intermetallic compound Ni 3 The mixed powder of Al is subjected to deoxidation pretreatment under a hydrogen atmosphere at 400°C±50°C; then, the B powder with a mass percentage of 0.0053% and the balance of the above-mentioned tungsten carbide and nickel-aluminum intermetallic c...
Embodiment 3
[0022] Embodiment 3: According to figure 1 In the process shown, according to the composition ratio of Ni-24at.%Al, the mass percentage of 16.99% nickel powder and aluminum powder is mixed evenly with the remaining tungsten carbide powder; the above mixed powder is placed in a graphite container and paved with a thickness of 20mm , in a non-oxidizing atmosphere, heated to 1160 °C at a heating rate of 1 °C / min, kept for 3 hours, and then cooled naturally to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni 3 A mixture of Al; the mixture is ground, crushed, and passed through a 160-mesh sieve to obtain tungsten carbide and nickel-aluminum intermetallic compound Ni with a particle size of 96 μm or less. 3 Mixed powder of Al; the above-mentioned tungsten carbide and nickel-aluminum intermetallic compound Ni 3 The mixed powder of Al is subjected to deoxidation pretreatment in a hydrogen atmosphere at 400°C±50°C; then, the B powder with a mass percentage of 0.00...
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