Injection molding preparation method and products of binder and tial alloy turbine
A technology of injection molding and binder, which is applied in the direction of turbines, metal processing equipment, mechanical equipment, etc., can solve the problems of slow response, poor responsiveness, lagging response of turbines, etc., and achieve improved shape retention, low equipment requirements, and material utilization high rate effect
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[0034] The invention discloses an injection molding preparation method of a TiAl alloy turbine. The method specifically includes the following steps:
[0035] S1, preparation of feed: mixing TiAl-based pre-alloyed powder and the above-mentioned binder, and then crushing to form granular feed.
[0036] In this step, the TiAl-based pre-alloyed powder and the above-mentioned binder are selected as raw materials, and the ratio of the TiAl-based pre-alloyed powder and the binder is determined, wherein the content of the binder is 60-65vol.%; TiAl The composition of the base pre-alloyed powder is calculated by atomic percentage: the content of Al is 43-49 at.%, the content of Cr is 0-5 at.%, the content of Nb is 1-8 at.%, and the balance is Ti; the scanning electron microscope morphology is as follows figure 1 shown. Put the above-mentioned TiAl-based pre-alloyed powder and binder into an internal mixer for uniform mixing, and then crush it through a crusher to make granular feed; ...
Embodiment 1
[0045] S1, preparation of feed: first select TiAl-based pre-alloyed powder and binder, wherein: the composition of TiAl-based pre-alloyed powder is 48at.%Al, 2at.%Cr, 2at.%Nb, and the balance is Ti; then Select 65% of the solid powder loading, weigh 65% paraffin wax, 6% high-density polyethylene, 9% polypropylene, 15% silicone resin, and 5% stearic acid in a volume ratio to form binder system;
[0046] Then mix the TiAl-based pre-alloyed powder with the binder at a temperature of 160° C., a rotational speed of 20 r / min, and a time of 2 h. After the mixing is completed and cooled to room temperature, take out the feed, and then pass through the crushing mechanism to obtain granular feed.
[0047] S2, injection molding:
[0048] Put the feed material into the injection machine and heat it to 165°C for injection. The injection pressure is 60MPa, the holding pressure is 70MPa, the holding time is 10s, the mold temperature is 60°C, and the injection speed is 50% of the maximum in...
Embodiment 2
[0054] S1, preparation of feed: first select TiAl-based pre-alloyed powder and binder, wherein: the composition of TiAl-based pre-alloyed powder is 46at.%Al, 1at.%Cr, 3at.%Nb, and the balance is Ti; then Select 67% of the solid powder loading, weigh 65% paraffin wax, 9% high-density polyethylene, 9.5% polypropylene, 9% silicone resin, and 7.5% stearic acid in a volume ratio to form binder system;
[0055] Then mix the TiAl-based pre-alloyed powder with the binder at a temperature of 165° C., a rotational speed of 25 r / min, and a time of 2 h. After the mixing is completed and cooled to room temperature, take out the feed, and then pass through the crushing mechanism to obtain granular feed.
[0056] S2, Injection Molding: put the feed into the injection machine and heat it to 167°C before injection, the injection pressure is 60MPa, the holding pressure is 70MPa, the holding time is 15s, the mold temperature is 70°C, and the injection speed is the maximum of the injection machi...
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