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Valve seat made of iron-base sintered alloy

An iron-based sintering and valve seat technology, which is applied to the parts in contact between the valve element and the valve seat, the lifting valve, the valve device, etc., can solve the problems of valve wear, poor machinability, and processing difficulties, and avoid breakage. Continuous cutting, suppression of peeling, and cost reduction effects

Inactive Publication Date: 2015-03-18
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, wear-resistant sintered alloys in which TiN is dispersed are poor in machinability due to the lack of adhesion between TiN and the substrate, resulting in poor machinability and high-cost materials.
In addition, since the opponent material is relatively aggressive, there is also a problem of wearing out the valve.

Method used

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  • Valve seat made of iron-base sintered alloy
  • Valve seat made of iron-base sintered alloy
  • Valve seat made of iron-base sintered alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6 and comparative example 1～4

[0027] The particle size distribution has a peak at 150-200 mesh and is composed of Cr: 11.3%, Mo: 0.96%, V: 1.9%, Si: 0.78%, C: 1.1%, balance: Fe (and unavoidable impurities) To the pre-alloyed powder, add graphite powder in a predetermined amount such that C has the matrix composition shown in Table 1, and further mix FeP which is expected to function as a liquid phase auxiliary agent. The mass of the entire alloy is 3 to 5% (Table 1 shows the mass % in the matrix.), and 10 mass % of hard particles composed of Fe-Mo-Si alloy with a Vickers hardness of Hv 1175 and an average particle size of 29 μm Or 15% by mass, kneading with a mixer to make mixed powder. Table 1 shows the mixing ratio of the matrix composition and the Fe—Mo—Si hard particles in each of Examples and Comparative Examples. In addition, 0.5% by mass of zinc stearate was added to the raw material powder based on the amount of the raw material powder in order to improve releasability in the molding step. In add...

Embodiment 7

[0040] As the hard particles, a Vickers hardness of Hv 980 and 15% by mass of Cr-W-Co-Fe alloy with an average particle diameter of 28 μm were blended, except that, the same mixing, molding, and sintering were performed as in Example 4 to produce ring-shaped particles. Sintered body. Here, the Cr-W-Co-Fe alloy used has the following composition: by mass %, Cr: 31.8%, W: 22.0%, Co: 8.4%, C: 2.1%, balance: Fe and Impurities to avoid constitute. The density and hardness of the sintered body were measured, and the wear test was also performed in the same manner as in Example 4. The composition of the matrix and the kind and mixing ratio of the hard particles are shown in Table 3, and the density and hardness of the sintered body and the results of the abrasion test are shown in Table 4.

Embodiment 8

[0042] As the hard particles, 10% by mass of the Fe-Mo-Si alloy used in Example 4 and 5% by mass of the Cr-W-Co-Fe alloy used in Example 7 were blended, except that it was the same as Example 4 Mixing, molding, and sintering are performed to produce a ring-shaped sintered body. The density and hardness of the sintered body were measured, and the wear test was performed in the same manner as in Example 4. The composition of the matrix and the kind and mixing ratio of the hard particles are shown in Table 3, and the density and hardness of the sintered body and the results of the abrasion test are shown in Table 4 together with the results of Example 7.

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Abstract

In order to provide a valve seat which is made of an iron-base sintered alloy having excellent abrasion resistance and machinability and which is usable in a diesel engine accommodating an output increase, the present invention comprises: using an intermetallic compound having a Vickers hardness (Hv) of 800 to 1200; and adjusting the contents of C and P in the composition of an iron-base sintered valve seat to 1.2 to 1.6 mass% and 0.80 to 1.35 mass% respectively.

Description

technical field [0001] The present invention relates to a valve seat of an internal combustion engine, and in particular to an iron-based sintered alloy valve seat excellent in both wear resistance and machinability, which can be used in a high-output, high-load diesel engine. Background technique [0002] The valve seat is mounted on the cylinder head of the internal combustion engine, and is repeatedly hit through the valve in a high-temperature environment. Therefore, various improvements have been made to improve wear resistance and heat resistance. Especially in high-load diesel engines with high output power, the improvement of combustion efficiency to cope with the environment tends to increase the load on the valve seat material accompanying metal contact. At high operating temperatures, improved wear resistance is required more than ever. Hitherto, as a valve seat for a diesel engine, for example, Japanese Patent Application Laid-Open No. 61-19762 discloses a wear-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/00B22F5/00C22C27/04C22C30/00F01L3/02
CPCB22F5/106C22C38/002C22C38/36C22C33/0285C21D2211/004C22C38/22F01L3/22C21D2211/008C22C38/02C22C38/30F01L3/02C21D6/002C22C38/00C22C38/24C22C33/02F16K25/005
Inventor 桥本公明逸见浩二
Owner RIKEN CO LTD
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