Tungsten-cobalt carbide/molybdenum disulfide composite powder and its preparing method
A molybdenum disulfide and composite powder technology is applied in the field of hard wear-resistant coatings to achieve the effects of good wear resistance, high bonding strength and easy thickness control
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Embodiment 1
[0030] The base material is A3 steel, the size of the ring block wear sample is 10mm×9.7mm×19mm, and the size of the sprayed surface is 10mm×19mm. Powder for detonation spraying is self-prepared WC-12Co+2%MoS 2 (weight percent) powder, the substrate is ground, sandblasted and cleaned before the coating is sprayed, and WC-Co+MoS is prepared by "OB" type explosive spraying system within two hours after substrate pretreatment 2 Composite coating, nitrogen is used as powder feeding gas and sweeping gas, oxygen and acetylene are used as heat source gas. The gas flow ratio of oxygen and acetylene is 1.05, the working frequency is 4-6 times per second, the spraying distance is 120 mm, the nozzle diameter is 20-25 mm, the powder feeding rate is 0.3-0.9 g / s, and the spraying disc is lapped The ratio is 30-50%, and a coating with a thickness of 150-400 μm is obtained.
[0031] Take the cross-section of the sample as the analysis surface, and make a metallographic sample, after alcohol...
Embodiment 2
[0035]The base material is A3 steel, the size of the abrasive wear sample is Ф4mm×30mm, and the coating surface is the cylindrical end surface. The size of the wear sample of the ring block is 10mm×9.7mm×19mm, and the size of the sprayed surface is 10mm×19mm. Powder for detonation spraying is self-prepared WC-12Co+4%MoS 2 (weight percent) powder, the substrate is ground, sand blasted and cleaned before spraying the coating, and WC-12Co+4%MoS is prepared by "OB" type explosive spraying system within two hours after substrate pretreatment 2 Composite coating, nitrogen is used as powder feeding gas and sweeping gas, oxygen and acetylene are used as heat source gas. The gas flow ratio of oxygen and acetylene is 1.05, the working frequency is 4-6 times per second, the spraying distance is 120 mm, the nozzle diameter is 20-25 mm, the powder feeding rate is 0.3-).9 g / s, the spraying disc The overlapping rate is 30-50%, and a coating with a thickness of 150-400 μm is obtained.
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Embodiment 3
[0040] The base material is A3 steel, the size of the ring block wear sample is 10mm×9.7mm×19mm, and the sprayed surface is 10mm×19mm. Powder for detonation spraying is self-prepared WC-12Co+6%MoS 2 (weight percent) powder, the substrate is ground, sand blasted and cleaned before spraying the coating, and WC-12Co+6%MoS is prepared by "OB" type explosive spraying system within two hours after substrate pretreatment 2 Composite coating, nitrogen is used as powder feeding gas and sweeping gas, oxygen and acetylene are used as heat source gas. The gas flow ratio of oxygen and acetylene is 1.05, the working frequency is 4-6 times per second, the spraying distance is 120 mm, the nozzle diameter is 20-25 mm, the powder feeding rate is 0.3-0.9 g / s, and the spraying disc is lapped The ratio is 30-50%, and a coating with a thickness of 150-400 μm is obtained.
[0041] Take the cross-section of the sample as the analysis surface, and make a metallographic sample, after alcohol cleaning...
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