A medium-entropy alloy self-lubricating composite material and preparation method thereof
A composite material and entropy alloy technology, which is applied in the field of medium-entropy alloy self-lubricating composite materials and its preparation, can solve the problems of low friction coefficient wear resistance, easy agglomeration of nano-silver, poor bonding between hexagonal boron nitride and alloy matrix, etc.
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[0025] The invention provides a preparation method of a medium-entropy alloy self-lubricating composite material, comprising the following steps:
[0026] Mixing hexagonal boron nitride, dopamine and water, and performing polymerization coating to obtain polydopamine-coated hexagonal boron nitride; the particle size of the hexagonal boron nitride is micron level;
[0027] The silver nitrate solution and ammonia water are mixed to obtain silver ammonia solution;
[0028] Mixing the silver ammonia solution, polyvinylpyrrolidone, polydopamine-coated hexagonal boron nitride and glucose aqueous solution, and performing a reduction reaction to obtain silver-coated hexagonal boron nitride;
[0029] The medium-entropy alloy powder and the silver-coated hexagonal boron nitride are mixed, and the obtained mixture is placed in a mold for hot pressing and sintering, and after demoulding, a medium-entropy alloy self-lubricating composite material is obtained.
[0030] In the present inven...
Embodiment 1
[0046] Add 1 g of hexagonal boron nitride to 250 mL of ultrapure water for ultrasonic dispersion for 20 min, add 1 g of dopamine, add buffer to adjust the pH to 8, stir at room temperature for 14 hours, filter, wash, and put in an oven at 80 °C. After drying, polydopamine-coated hexagonal boron nitride was obtained.
[0047] Add 5g of silver nitrate to 250mL of deionized water, stir for 10min, add 25mL of ammonia water (20% by mass) until the solution changes from clear to turbid and then clear, add 1g of polyvinylpyrrolidone, stir for 30min, add 5g by mass Polydopamine-coated hexagonal boron nitride was added, ultrasonically dispersed for 30 min, then added 300 mL of aqueous glucose solution (concentration of 40 g / L), stirred at room temperature for 60 min, suction filtered, washed, and dried in an oven at 100 °C to obtain silver Coated hexagonal boron nitride.
[0048] Mix 40g of CrCoNi medium entropy alloy powder and 4g of silver-coated hexagonal boron nitride in a ball mi...
Embodiment 2
[0051] Add 2 g of hexagonal boron nitride by mass to 300 mL of ultrapure water for ultrasonic dispersion for 20 min, add 2 g of dopamine, add buffer to adjust the pH to 8, stir at room temperature for 12 hours, filter, wash, and put in an oven at 80 °C. After drying, polydopamine-coated hexagonal boron nitride was obtained.
[0052] Add 7g of silver nitrate to 250mL of deionized water, stir for 20min, add 30mL of ammonia water (25% by mass) until the solution changes from clear to turbid and then clear, add 2g of polyvinylpyrrolidone, stir for 30min, add 7g of mass fraction Dopamine-coated hexagonal boron nitride was added, ultrasonically dispersed for 30 min, and then 400 mL of aqueous glucose solution (concentration of 45 g / L) was added, stirred at room temperature for 70 min, suction filtered, washed, and dried in an oven at 80 °C to obtain silver packets. Coated hexagonal boron nitride.
[0053] Mix 60g of CrCoNi medium-entropy alloy powder and 6g of silver-coated hexagon...
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