A kind of wc-ni-cr/ta composite cemented carbide and its preparation method and application
A technology of composite materials and hard alloys, which is applied in metal processing equipment, transportation and packaging, coating, etc., can solve the problems of powder particle breakage, powder shape damage, high price, etc., and achieve the purpose of suppressing abnormal growth of grains, The effect of uniform particle size and low price
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Embodiment 1
[0040] The proportioning ratio of each raw material is shown in Table 1
[0041] Table 1 raw material ratio table
[0042] HNO 3
HF Cr 3 C 2
Ni(NO 3 ) 2 ·6H 2 o
TEA Methanol WC 30ml / L 30ml / L 0.48g 34.67g 8.94g 230ml 62.58g
[0043] Take tungsten carbide powder with an average particle size of about 10-14μm and a purity of 99.9%, and place it in 500mL hydrofluoric acid-nitric acid mixed aqueous solution for roughening under mechanical stirring conditions, wherein the hydrofluoric acid concentration is 30mL / L, and the nitric acid The concentration is 30mL / L, the stirring time is 30min, and the rotation speed is 120r / min. After stirring and soaking for 30min, the powder is filtered with a suction filter and washed twice with deionized water, then put into a drying oven and dried at 60°C .
[0044] Cr is 0.2% by mass percentage, Ni is 10.1%, WC is 89.7%, 0.48g Cr 3 C 2 and 34.67g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 230...
Embodiment 2
[0049] The proportioning ratio of each raw material is shown in Table 3
[0050] Table 3 raw material ratio table
[0051]
[0052]
[0053] The average particle size is about 10-14μm, and the tungsten carbide powder with a purity of 99.9% is placed in 500mL of hydrofluoric acid-nitric acid mixed aqueous solution for coarsening treatment under the condition of mechanical stirring, wherein the concentration of hydrofluoric acid is 30mL / L, and the concentration of nitric acid The concentration is 30mL / L, the stirring time is 30min, and the rotation speed is 120r / min. After stirring and soaking for 30min, the powder is filtered with a suction filter and washed twice with deionized water, then put into a drying oven and dried at 60°C .
[0054] Ta is 0.6% by mass percentage, Ni is 10.1%, and WC is 89.3%, with 0.45g TaC and 34.67g Ni (NO 3 ) 2 ·6H 2 O was dissolved in 230ml of methanol and stirred thoroughly. After it is completely dissolved, add TEA and Ni at a molar ra...
Embodiment 3
[0060] The composition of embodiment 3 and preparation are identical with embodiment 1, difference is:
[0061] By mass percentage: Ni: 8%, Cr: 0.2%, the balance is WC; the concentration of hydrofluoric acid (HF) is 20mL / L, and the concentration of nitric acid is (HNO 3 ) 20mL / L, stir evenly for 20min during coarsening, wash 4 times with deionized water; the molar ratio of TEA and Ni is 1:1;
[0062] In step (2), add the WC powder pretreated in step (1) into the complexing solution and stir evenly, and mix evenly with mechanical stirring, the speed is 150r / min, and the stirring time is 40min; stop stirring and then mix The solution was left to stand for 30 minutes. Ni salt precursor, in N 2 Calcined at 500°C in air for 4h to obtain WC-Ni-Cr composite powder, and cooled in the furnace after the calcining was completed; the pressure of step (4) pressing to form embryos was 20MPa. Step (5) The sintering process is to rise from room temperature to 240°C at a rate of 4°C / min, ho...
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