A copper-based-graphite positive gradient composite material and preparation method thereof
A composite material and graphite technology, used in mechanical equipment, heat exchange equipment, transmission devices, etc., can solve the problems of high density and particle size gradient change requirements, low density, and difficulty in industrial production. Solve the effect of insufficient bonding strength, ensure self-lubricating performance, and prevent downward expansion
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Embodiment 1
[0023] Concrete preparation steps are as follows:
[0024] Step 1: Take graphite powder (200 mesh, purity 99.5%) and phenolic resin powder (600 mesh), mix them evenly and put them into a selective laser sintering molding machine, wherein the phenolic resin powder is used as a binder, and the phenolic resin The powder accounts for 30% of the total mass fraction of the mixed powder. A porous graphite framework body with a positive gradient structure was prepared by selective laser sintering forming technology (such as figure 1 shown). From the surface to the inside, the graphite content decreases linearly, and the graphite distribution is relatively uniform on any cross-section. The graphite content in section 1 is 10% of the copper alloy mass fraction, the graphite content in section 2 is 6.5% of the copper alloy mass fraction, and the graphite content in section 3 is 3% of the copper alloy mass fraction. Section 1, Section 2 and Section 3 are friction and wear surfaces. Th...
Embodiment 2
[0029] Concrete preparation steps are as follows:
[0030] Step 1: Take graphite powder (250 mesh, purity 99.5%) and phenolic resin powder (800 mesh), mix them evenly and put them into a selective laser sintering molding machine, wherein the phenolic resin powder is used as a binder, and the phenolic resin The powder accounts for 50% of the total mass of the mixed powder. A porous graphite framework body with a positive gradient structure was prepared by selective laser sintering forming technology (such as figure 1 shown). From the surface to the inside, the graphite content decreases linearly, and the graphite distribution is relatively uniform on any cross-section. The graphite content in section 1 is 10% of the copper alloy mass fraction, the graphite content in section 2 is 6.5% of the copper alloy mass fraction, and the graphite content in section 3 is 3% of the copper alloy mass fraction. Section 1, Section 2 and Section 3 are friction and wear surfaces. The diamete...
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