High mechinability iron base sintered alloy for valve seat inserts

A backing plate and valve seat technology, which is applied in the direction of lift valves, valve devices, machines/engines, etc., can solve the problems of expensive automotive applications and achieve the effect of reducing costs

Inactive Publication Date: 2007-05-16
FEDERAL MOGUL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although Co alloys exhibit a good balance of various properties, the price of Co is that these alloys are too expensive for automotive applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] In order to understand the present invention more completely, some key properties are given and compared with the properties of existing typical valve seat pad materials. The powder mixture composition of the example materials is stated in Table 1 and the properties are given in Table 2

[0019] Table 1: Composition of Powder Blends of Example Materials

[0020] material name

Fe or low alloy

Steel wt%

Cu wt% or infiltration

Tool steel; wt%

C wt%

graphite

solid lubrication

Agent wt%

new material

89.25

penetrate

8.5

0.75

1.5

Alloy A

49.50

penetrate

49.50

0.5

0.50

Alloy B

48.37

-

48.37

0.26

3

[0021] In Table 1, Fe represents matrix powder, which is used in the mixture, and can be single iron powder or alloy steel powder. Tool steel powders represent the second component of the...

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PUM

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Abstract

A ferrous sintered valve seat material is made of mixed powders comprising a sinter-hardenable phase and a finely dispersed carbide phase. The powder mixture comprises a sinter-hardening prealloyed powder forming 75 to 90 wt.% of the mixture and a tool steel powder with finely dispersed carbides forming 5 to 25% of the mixture. Machinability additives of MnS, CaF2 or MoS2 types are added in an amount of 1 to 5 wt.%. Improved thermal conductivity is obtained by infiltrating the compact with Cu up to 25 wt.%.

Description

technical field [0001] The present invention relates generally to iron-based sintered alloy compositions for use in the manufacture of valve seat plates for internal combustion engines. Valve seat inserts (VSI) work in very harsh environments. Seat backing alloys need to resist wear and / or sticking caused by mating seating surfaces, resist softening and degradation caused by high operating temperatures, and resist corrosion caused by combustion products. Background technique [0002] The valve seat backing plate is machined after being inserted into the cylinder head. The cost of machining the valve seat backing plate accounts for a large portion of the total cost of machining the cylinder head. During machining operations, this becomes a major problem in the design of seat backing plate alloys since the hard material phase that makes the alloy wear resistant also causes severe wear to cutting tools. [0003] Sintered alloys have replaced cast alloys for valve seat back p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/12C22C33/02B22F1/00B22F5/00C22C38/00F01L3/02
CPCC22C33/0221B22F2998/00F01L3/02C22C33/0207C22C33/0242C22C33/02
Inventor M·伯勒S·尼格鲁拉J·特拉索拉斯
Owner FEDERAL MOGUL CORP
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