PURPOSE: To improve the rigidity, strength and wear resistance of the resulting titled alloy by prescribing the amount of hard particles in a sintered high-carbon iron alloy contg. Ni, Cr, Mo, W and Co and the pore volume of the alloy and by infiltrating a Cu alloy into the continuous pores among the pores in the alloy.
CONSTITUTION: This sintered alloy for a valve seat contains hard particles dispersed in the matrix structure and a Cu alloy infiltrated into pores. The alloy has a composition consisting of, by weight, 0.5W1.7% C, 0.5W2.5% Ni, 3.0W 8.0% Cr, 0.1W0.9% Mo, 1.0W3.8% W, 4.5W8.5% Co and the balance essentially Fe. The hard particles are C-Cr-W-Co-Fe particles and Fe-Mo particles of ≤250 mesh, and they are contained in the matrix structure by 8W14vol%. The matrix is formed of atomized powder. The pore volume is 6W13vol%, and the Cu alloy is infiltrated into the continuous pores among the pores to reduce the pore volume remarkably thus increasing the rigidity, strength and wear resistance of the product.
YAMAMOTO KIYOSHI
TAKAGI YOSHIAKI
SUGAWARA TAKEKI
HONDA MOTOR CO LTD
| JPS50141515A | 1975-11-14 | |||
| JPS5060409A | 1975-05-24 | |||
| JPS5486410A | 1979-07-10 |