| 摘要 |
PURPOSE: A valve for improving performance of a diesel vehicle and a producing method thereof are provided to improve abrasion resistance for unifying a gap between a locker arm and a valve upper portion to reduce generation of hazardous gas while saving fuel and improving engine output. CONSTITUTION: A ceramic cemented carbide is combined on an upper portion of a valve in a brazing combining method for improving abrasion resistance. Herein, the cemented carbide is formed by 15wt% of CO, 65wt% of Ni, 10wt% of C, and 10% of W. Thickness of the cemented carbide is 1.5mm in a disk shape having a diameter identical with a diameter of the valve upper portion. Moreover, brazing alloy is formed by 5wt% of B, 3wt% of Ti, 30wt% of Cu, and 62wt% of Ag. Herein, the brazing alloy is formed in a thin film shape having a thickness of 50 micrometers. After placing the valve on a furnace, the brazing alloy and the cemented carbide are located to perform processes at a pressure of 10¬-5Torr and a temperature of 850-910deg.C for 10-15 minutes.
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