JP2022050275A5

JP2022050275A5 -

Info

Publication number: JP2022050275A5
Application number: JP2020156789A
Authority: JP
Filing date: 2020-09-17
Publication date: 2022-09-29

Claims

A sintered valve seat in which a ring-shaped seat layer that is press-fitted into a cylinder head of an internal combustion engine and repeatedly abuts against a valve and a ring-shaped support layer that contacts the cylinder head are integrated, the seat layer comprising: The outer peripheral surface and the outer peripheral surface of the support layer together constitute the outer peripheral surface of the sintered valve seat,
The sheet layer includes a sheet layer body containing a matrix made of an Fe alloy and hard particles made of a Co-based alloy dispersed in the matrix, and Cu or a Cu alloy filled in the pores of the sheet layer body. and including
The content of the Fe alloy in the sheet layer main body is 55 to 90% by mass,
The support layer includes a matrix made of one or both of Cu and a Cu alloy, and one or both of Fe particles and Fe alloy particles dispersed in the matrix,
The total content of the Cu and Cu alloy in the support layer is more than 35% by mass and 95% by mass or less.
A sintered valve seat characterized by:

2. The sintered valve seat according to claim 1, wherein the content of said hard particles in said seat layer body is 9 to 45% by mass.

The sintering according to claim 1, wherein the content of the Fe alloy in the sheet layer body is 61 to 85% by mass, and the content of the hard particles in the sheet layer body is 15 to 39% by mass. valve seat.

The firing according to any one of claims 1 to 3, wherein the content of Cu or Cu alloy filled in the pores of the sheet layer body is 15 to 40% by mass with respect to the sheet layer body. Knot valve seat.

A sintered valve seat according to any one of claims 1 to 4, wherein the Fe alloy in the seat layer body is high speed steel.

A sintered valve seat according to any one of claims 1 to 5, wherein the Co-based alloy in the seat layer body is a Co-Mo-Cr-Si alloy.

7. The sheet layer main body further comprises particles made of a solid lubricant dispersed in the matrix, and the content of the solid lubricant in the sheet layer main body is 3% by mass or less. A sintered valve seat according to claim 1.

The sintered valve seat according to claim ₇ , wherein said solid lubricant is at least _one selected from C, BN, MnS, MoS2, _CaF2 , WS2 and _SiO2 .

The sintered valve seat according to any one of claims 1 to 8, wherein the seat layer further contains a sintering aid, the content of which is 1.5% by mass or less relative to the seat layer main body. .

10. The sintered valve seat according to claim 9, wherein said sintering aid is at least one selected from FeB, FeP and NiP.

The sintered valve according to any one of claims 1 to 10, wherein the support layer has a total content of Fe particles and Fe alloy particles dispersed in the matrix of 5% by mass or more and less than 65% by mass. sheet.

The sintered valve seat according to any one of claims 1 to 11, wherein the Fe alloy particles in the support layer are at least one selected from Fe--Cr alloy, Fe--Cr--Mo alloy, and SKD11. .

A sintered valve seat according to any one of claims 1 to 12, wherein the ratio of the seat layer and the support layer is 10:90 to 40:60 in area ratio.