JP2015196903A5 - Method for producing Ag / SnO2 electrical contact powder and method for producing Ag / SnO2 electrical contact material - Google Patents

Claims (14)

Tin oxide, lanthanum oxide, copper oxide and cadmium oxide are mixed in a mass ratio of 1: (0.08 to 0.5): (0.05 to 0.7): (0.08 to 0.5). Step 1 to obtain a nanocomposite powder by preparing a mixed powder and performing ball milling at a rotational speed of 800-1500 times / minute on the mixed powder;
The nanocomposite powder obtained in step 1 and the silver powder are blended at a ratio of 11-22 mass% of the nanocomposite powder and 78-89 mass% of the silver powder, and ball milling at a rotational speed of 130-250 times / minute is performed. A process for producing a powder for an Ag / SnO ₂ electrical contact, comprising: step 2 of mixing the nanocomposite powder into silver powder particles. The method for producing a powder for an Ag / SnO ₂ electric contact according to claim 1, further comprising a step 3 of granulating the powder obtained in the step 2. In the step 3, the powder obtained in the step 2 was put in a furnace having a temperature of 500 to 650 ° C., kept warm for 0.5 to 2.0 hours, and then cooled in another room temperature furnace. The method for producing a powder for an Ag / SnO ₂ electrical contact according to claim 2, wherein the product is pulverized, passed through a sieve of 40 to 60 mesh, and the undersieve is collected. In the step 1, the ball to powder mass ratio is (10 to 30): 1, alcohol is used as a medium, and ball milling is performed for a total of 1 to 3 hours to stop for 30 minutes (however, the stop time is The method for producing a powder for an Ag / SnO ₂ electrical contact according to any one of claims 1 to 3, wherein the powder is dried at room temperature through a sieve. 5. The method for producing a powder for an Ag / SnO ₂ electric contact according to claim 4, wherein a stainless steel ball is employed in the step 1. In the step 1, the density of the stainless steel sphere is 7.8 g / cm ³ , and the volume of the stainless steel sphere is 0.040% to 0.355% of the volume of the ball mill can. The method for producing a powder for an Ag / SnO ₂ electrical contact according to claim 5, wherein the total volume with the mixed powder occupies 30 to 40% of the volume of the ball mill can. In the step 2, a silver powder obtained by mixing silver powder having an average particle diameter of 60 to 80 μm and silver powder having an average particle diameter of 40 to 53 μm in a mass ratio (1 to 10) :( 0 to 2) is used. Ag / SnO ₂ electrical production method of contact for powder according to any one of claims 1 to 3. In step 1, the tin oxide, the lanthanum oxide, the copper oxide, and the cadmium oxide all have an average particle size of 40 to 270 μm, and the nano composite powder has an average particle size of 100 to 500 nm. Ag / SnO ₂ electrical production method of contact for powder according to claim 1, characterized. The Ag / SnO ₂ electricity according to any one of claims 1 to 3, wherein in the step 2, the mass ratio of the ball and the powder is set to (6 to 20): 1 and ball milling is performed for 4 to 10 hours. A method for producing contact powder. 10. The method for producing a powder for an Ag / SnO ₂ electric contact according to claim 9, wherein a stainless steel ball is employed in the step 2. Step 4 for forming and sintering the powder granulated in Step 3 according to claim 2;
And a step 5 of annealing the material obtained in step 4, and a method for producing an Ag / SnO ₂ electrical contact material. The step 4 is characterized in that, when forming, the powder granulated in the step 3 is isostatically molded to form a columnar body at a pressure of 100 to 190 MPa and held for 0.3 to 1 minute. Item 12. A method for producing an Ag / SnO ₂ electrical contact material according to Item 11. In step 4, when the material is sintered, the molded material is placed in a furnace at a temperature of 300 to 550 ° C. and kept warm for 1 hour, then placed in a furnace at a temperature of 700 to 860 ° C. and kept warm for 5 to 7 hours. The method for producing an Ag / SnO ₂ electric contact material according to claim 12, wherein hot pressing is performed at an extrusion ratio (10 to 20): 1. 14. The Ag / according to claim 13, wherein the step 5 includes rolling the material obtained by the hot pressing in the step 4 and annealing at a temperature of 500 to 700 ° C. for 2 to 3 hours. manufacturing method of SnO ₂ electrical contact material.