AgNi electrical contact material and preparation method thereof
A technology for electrical contact materials and blanks, which is applied to contact materials and other directions, can solve the problems of limited improvement in welding resistance and poor welding resistance, and achieve the effect of improving welding resistance and prolonging service life.
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Embodiment 1
[0034] 1. First pass 89.9wt% Ag powder and 10wt% Ni powder through a 200-mesh sieve;
[0035] 2. Mix and ball mill with 0.1wt% WC powder (average particle size is 0.1 μm) afterwards;
[0036] 3. Then the ball-milled powder is pressed into a green body under an isostatic pressure of 100MPa;
[0037] 4. Sinter the compact at 950°C for 5 hours in a hydrogen atmosphere;
[0038] 5. Then hot-press the sintered body, the hot-pressing temperature is 500°C, the hot-pressing pressure is 700MPa, and the pressure is kept for 5 minutes;
[0039] 6. Then refire the green body after hot pressing according to the above step 4) sintering process;
[0040] 7. Then hot-extrude the reburned green body into a wire or plate on a hydraulic press. The hot-extrusion temperature is 400°C, the hot-extrusion speed is 5cm / min, the mold preheating temperature is 100°C, and the extrusion ratio for 10.
[0041] Compared with the traditional AgNi material, the electrical life of the obtained material is ...
Embodiment 2
[0043] 1. First pass 90% Ag powder and 5wt% Ni powder through a 200-mesh sieve;
[0044] 2. Mix and ball mill with 5wt% WC powder (average particle size is 10 μm) afterwards;
[0045] 3. Then the ball-milled powder is pressed into a green body under an isostatic pressure of 500MPa;
[0046] 4. Sinter the compact at 750°C for 10 hours in a hydrogen atmosphere;
[0047] 5. Then hot-press the sintered body, the hot-pressing temperature is 950°C, the hot-pressing pressure is 100MPa, and the pressure is maintained for 60 minutes;
[0048] 6. Then refire the green body after hot pressing according to the above step 4) sintering process;
[0049] 7. Then hot-extrude the reburned body into a wire or plate on a hydraulic press. The hot-extrusion temperature is 900°C, the hot-extrusion speed is 8cm / min, the mold preheating temperature is 500°C, and the extrusion ratio for 400.
[0050] Compared with the traditional AgNi material, the electrical life of the obtained material is incre...
Embodiment 3
[0052] 1. First pass 90wt% Ag powder and 6wt% Ni powder through a 200-mesh sieve;
[0053] 2. Mix and ball mill with 4wt% WC powder (average particle size is 0.1 μm) afterwards;
[0054] 3. Then the ball-milled powder is pressed into a green body under an isostatic pressure of 400MPa;
[0055] 4. Sinter the compact at 900°C for 8 hours in a hydrogen atmosphere;
[0056] 5. Then hot-press the sintered body, the hot-pressing temperature is 550°C, the hot-pressing pressure is 700MPa, and the pressure is maintained for 40 minutes;
[0057] 6. Then refire the green body after hot pressing according to the above step 4) sintering process;
[0058] 7. Then hot-extrude the refired green body into wire rod or plate. The hot-extrusion temperature is 450°C, the hot-extrusion speed is 8cm / min, the mold preheating temperature is 250°C, and the extrusion ratio is 250.
[0059]Compared with the traditional AgNi material, the electrical life of the obtained material is increased by 15 time...
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