Self-lubricating silicon nitride based composite material with high-wear-resistant surface in high-temperature environment
A composite material, silicon nitride-based technology, applied in the field of new materials, can solve the problems of poor self-lubricating ability and wear resistance of silicon nitride, not finding performance parameters of silicon nitride, and reducing the mechanical strength of silicon nitride, etc. Achieve the effect of improving high friction coefficient and wear rate, reducing friction coefficient and excellent effect
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Embodiment 1
[0023] (1) Preparation of mixed powder: according to mass percentage, 10% α-Si 3 N 4 and 90% Ti 2 SnC was added to the planetary ball mill for uniform ball mixing, 0.5 mL of alcohol was added to each 30 g mixed powder as a dispersant, the ball-to-material ratio was 5:1, the ball mill speed was 200r / min, clockwise for 30min, pause for 5min, and counterclockwise for 30min , pause for 5min, take this as a cycle, and cycle for 8 cycles.
[0024] (2) Pre-pressure drying: the mixed powder in step (1) is dried and sieved, and then loaded into a cylindrical graphite mold with a diameter of 25 mm, the pressure is 40 MPa, and the pressure holding time is 30 s.
[0025] (3) High temperature and high pressure sintering: perform high temperature and high pressure sintering on the pre-pressed sample in step (2). 10 -2 Pa, and then cooled with the furnace to obtain a blank.
[0026] (4) subjecting the blank prepared in (3) to surface grinding and deburring to obtain the new type of Si ...
Embodiment 2
[0028] (1) Preparation of mixed powder: according to mass percentage, 20% α-Si 3 N 4 and 80% Ti 2 SnC was added to the planetary ball mill for uniform ball mixing, 0.5 mL of alcohol was added to each 30 g mixed powder as a dispersant, the ball-to-material ratio was 5:1, the ball mill speed was 200 r / min, clockwise for 30 min, pause for 5 min, and counterclockwise Rotate for 30 minutes, stop for 5 minutes, take this as a cycle, and cycle for 8 cycles.
[0029] (2) Pre-press drying: The mixed powder in step (1) was dried and sieved, and then loaded into a cylindrical graphite mold with a diameter of 25 mm, the pressure was 40 MPa, and the pressure holding time was 30 s.
[0030] (3) High temperature and high pressure sintering: the pre-pressed sample in step (2) is sintered at high temperature and high pressure. The sintering parameters are: the pressure is 30MPa, the sintering temperature is 1650 ºC, the heating rate is 100 ºC / min, the holding time is 10 minutes, and the vacu...
Embodiment 3
[0033] (1) Preparation of mixed powder: according to mass percentage, 30% α-Si 3 N 4 and 70% Ti 2 SnC was added to the planetary ball mill for uniform ball mixing, 0.5 mL of alcohol was added to each 30 g mixed powder as a dispersant, the ball-to-material ratio was 5:1, the ball mill speed was 200r / min, clockwise for 30min, pause for 5min, and counterclockwise for 30min , pause for 5min, take this as a cycle, and cycle for 8 cycles.
[0034] (2) Pre-press drying: The mixed powder in step (1) was dried and sieved, and then loaded into a cylindrical graphite mold with a diameter of 25 mm, the pressure was 40 MPa, and the pressure holding time was 30 s.
[0035] (3) High temperature and high pressure sintering: the pre-pressed sample in step (2) is sintered at high temperature and high pressure. The sintering parameters are: the pressure is 30MPa, the sintering temperature is 1650 ºC, the heating rate is 100 ºC / min, the holding time is 10min, and the vacuum degree is 10 -2 Pa...
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