Chromium-based alloy heat-resistant sliding block and preparation method thereof
A chromium-based alloy and heat-resistant sliding block technology, applied in the field of powder metallurgy, can solve the problems of serious hot cracking tendency of alloys, increased manufacturing difficulty, and high production and manufacturing costs, and achieve the effects of reducing costs, excellent high-temperature strength, and high melting point.
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Embodiment 1
[0020] Example 1: Cr-11.0% Fe-2.0% Si-5.0% Mo heat-resistant slider
[0021] (1) Take chromium powder, low-carbon ferrochrome powder, ferrosilicon powder, and molybdenum powder according to the nominal composition ratio of the alloy, and mix them with 2% micronized wax ball mill in absolute alcohol for 24 hours, and the ball-to-material ratio is 1:1;
[0022] (2) After mixing uniformly by ball milling, place the prepared mixed powder in a vacuum dryer at 80°C for 12 hours;
[0023] (3) Design the colloidal sheath according to the size of the heat-resistant slider, pack the dry mixed powder into the sheath, and perform cold isostatic pressing under the conditions of a pressure of 400MPa and a holding time of 30s;
[0024] (4) dewax the heat-resistant slider green body after forming in a vacuum degreasing sintering furnace, and -1 Pa ultimate vacuum degree, sintering and densification at 1350°C temperature for 5 hours to obtain high-performance chromium-based alloy heat-resista...
Embodiment 2
[0027] Example 2: Cr-20.0% Fe-0.5% Si-3.1% Mo heat-resistant slider
[0028] (1) Weigh chromium powder, low-carbon ferrochrome powder, ferrosilicon powder, and molybdenum powder according to the nominal composition ratio of the alloy, and ball mill and mix them with 4% phenolic resin in n-hexane for 5 hours, and the ball-to-material ratio is 5:1;
[0029] (2) After ball milling and mixing evenly, the prepared mixed powder was dried in a vacuum dryer at 150°C for 4 hours;
[0030] (3) Design the colloidal sheath according to the size of the heat-resistant slider, pack the dry mixed powder into the sheath, and perform cold isostatic pressing under the conditions of a pressure of 100 MPa and a holding time of 10 minutes;
[0031] (4) Remove the phenolic resin from the heat-resistant slider green body after molding in a vacuum degreasing sintering furnace, and -3 Pa ultimate vacuum degree, sintering and densification at 1600°C for 1 hour to obtain high-performance chromium-based ...
Embodiment 3
[0032] Example 3: Cr-16.0% Fe-1.2% Si-4.0% Mo heat-resistant slider
[0033] (1) Take by weighing chromium powder, low-carbon ferrochrome powder, ferrosilicon powder, molybdenum powder according to the distribution ratio of alloy nominal composition, ball mill and mix 15h with 5% rubber gasoline solution in acetone, the ball material ratio is 3: 1;
[0034] (2) After ball milling and mixing evenly, the prepared mixed powder was dried in a vacuum dryer at 120°C for 8 hours;
[0035] (3) Design the colloidal sheath according to the size of the heat-resistant slider, pack the dry mixed powder into the sheath, and perform cold isostatic pressing under the conditions of a pressure of 240 MPa and a holding time of 4 minutes;
[0036] (4) Degumming the heat-resistant slider green body after forming in a vacuum degreasing sintering furnace, and -2 Pa ultimate vacuum degree, sintering and densification at 1450°C for 3 hours to obtain high-performance chromium-based alloy heat-resistan...
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