Normal-pressure multi-step sintering method for powder metallurgy of high-density Ti-Nb-Mo series alloy
A technology of ti-nb-mo and sintering method, which is applied in the field of alloys, can solve the problems of coarse grains of titanium alloys, increase power consumption and production costs, and low density, so as to achieve uniform structure and performance, accelerate diffusion speed, The effect of high density
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Embodiment 1
[0043] (1) Take by weighing raw material titanium powder 65%, niobium powder 25%, molybdenum powder 8%, vanadium powder 4% and chromium powder 3% according to mass percentage, carry out compression molding after mixing, obtain compact, wherein the temperature of compression molding is Room temperature, pressure 500MPa;
[0044] (2) After obtaining the compact, carry out programmed temperature rise, the specific operations are:
[0045] The vacuum degree in the sintering furnace is reduced to 2×10 -3 After Pa, flow H 2 Until the pressure in the furnace is stabilized at 1×10 5 After Pa, open the outlet valve and set H 2 The flow rate is kept at 150mL / min, and the temperature is first raised from room temperature to 500°C at a heating rate of 5°C / min;
[0046] Stop feeding hydrogen, and reduce the vacuum degree in the sintering furnace to 2×10 -3 After Pa, pass high-purity argon gas into the furnace, and the vacuum degree in the furnace rises to 1×10 5 After Pa, close the i...
Embodiment 2
[0052] (1) Take by weighing raw material titanium powder 65%, niobium powder 25%, molybdenum powder 8%, vanadium powder 4% and chromium powder 3% according to mass percentage, carry out compression molding after mixing, obtain compact, wherein the temperature of compression molding is Room temperature, pressure 400MPa;
[0053] (2) After obtaining the compact, carry out programmed temperature rise, the specific operations are:
[0054] The vacuum degree in the sintering furnace is reduced to 4×10 -3 After Pa, flow H 2 Until the pressure in the furnace is stabilized at 1×10 5 After Pa, open the outlet valve and set H 2 The flow rate was kept at 200mL / min, and the temperature was first raised from room temperature to 400°C at a heating rate of 5°C / min;
[0055] Stop feeding hydrogen, and reduce the vacuum degree in the sintering furnace to 2×10 -3 After Pa, pass high-purity argon gas into the furnace, and the vacuum degree in the furnace rises to 1×10 5 After Pa, close the...
Embodiment 3
[0062] (1) Take raw material titanium powder 54%, niobium powder 35%, molybdenum powder 8%, vanadium powder 2% and chromium powder 1% according to mass percentage, carry out compression molding after mixing, obtain compact, wherein the temperature of compression molding is At room temperature, the pressure is 450MPa;
[0063] (2) After obtaining the compact, carry out programmed temperature rise, the specific operations are:
[0064] The vacuum degree in the sintering furnace is reduced to 2×10 -3 After Pa, flow H 2 Until the pressure in the furnace is stabilized at 1×10 5 After Pa, open the outlet valve and set H 2 The flow rate is kept at 150mL / min, and the temperature is first raised from room temperature to 500°C at a heating rate of 5°C / min;
[0065] Stop feeding hydrogen, and reduce the vacuum degree in the sintering furnace to 2×10 -3 After Pa, pass high-purity argon gas into the furnace, and the vacuum degree in the furnace rises to 1×10 5 After Pa, close the inl...
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