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A kind of valve seat ring and preparation method thereof

A technology of valve seat ring and base body, which is applied in the field of valve seat ring and its preparation, and can solve the problems of limited fatigue life of valve seat ring

Active Publication Date: 2019-01-15
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent is still limited in improving the fatigue life of the valve seat ring.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The application also provides a method for preparing a valve seat ring, including the following steps:

[0029] A), pre-treat the surface of the valve seat base body;

[0030] B), using the electron beam evaporation method, the chromium plating layer on the surface of the valve seat base body obtained in step A);

[0031] C), using the magnetron sputtering method, deposit Al on the surface of the chrome layer of the valve seat obtained in step B) 2 O 3 Plating

[0032] D), annealing the valve seat obtained in step C).

[0033] In the process of preparing the valve seat ring in this application, a chromium transition layer and Al are sequentially deposited on the surface of the valve seat ring substrate by combining electron beam evaporation and magnetron sputtering. 2 O 3 The coating finally makes the valve seat ring have high strength, high thermal stability and low thermal conductivity and friction coefficient, which significantly improves the fatigue life of the valve seat rin...

Embodiment 1

[0044] Step 1: First use deionized water to heat and clean the valve seat, then ultrasonically clean in an acetone solution for 10 minutes, and then use anhydrous ethanol to clean the valve seat in ultrasonic for 10 minutes, and put the cleaned valve seat in a drying box for use;

[0045] Step 2: Using the electron beam evaporation method, the surface of the valve seat obtained in step 1 is coated with a Cr layer; the vacuum degree of the coating is 5×10 -4 Pa, the coating material is Cr powder with a purity of 99.99%, the working parameters are high pressure 8~8.5kv, electron beam current 100~120mA, time 2 hours;

[0046] Step 3: Use the magnetron sputtering method for the valve seat ring prepared in step 2, the target material is Al target, oxygen gas is introduced, and Al is plated on the surface of the seat ring 2 O 3 Coating: During the coating, the pressure in the vacuum chamber reaches 0.1-1Pa, the voltage is 3kv, and the electron beam current is 300mA. The surface of the valv...

Embodiment 2

[0050] Step 1: First use deionized water to heat and clean the valve seat, then ultrasonically clean in an acetone solution for 10 minutes, and then use anhydrous ethanol to clean the valve seat in ultrasonic for 10 minutes, and put the cleaned valve seat in a drying box for use;

[0051] Step 2: Using the electron beam evaporation method, the surface of the valve seat obtained in step 1 is coated with a Cr layer; the vacuum degree of the coating is 4×10 -4 Pa, the coating material is Cr powder with a purity of 99.99%, the working parameters are high voltage 8-9kv, electron beam current 100-120mA, time 2h;

[0052] Step 3: Use the magnetron sputtering method for the valve seat ring prepared in step 2, the target material is Al target, oxygen gas is introduced, and Al is plated on the surface of the seat ring 2 O 3 Coating: During the coating, the pressure in the vacuum chamber reaches 0.1-3Pa, the voltage is 2kv, and the electron beam current is 500mA, and the surface of the valve se...

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Abstract

The invention provides a valve seat ring. The valve seat ring comprises a valve seat ring base body, a chromium transition layer compounded to the valve seat ring base body and an Al2O3 plating layer compounded to the surface of the chromium transition layer. The invention further provides a preparation method of the valve seat ring. The preparation method comprises the following steps that (A) the surface of the valve seat ring base body is pretreated; (B) the surface of the valve seat ring base body obtained in the step (A) is plated with the chromium layer through an electron beam evaporation method; (C) the Al2O3 plating layer is deposited on the chromium layer plated surface of the valve seat ring obtained in the step (B) through a magnetron sputtering method; and (D) the valve seat ring obtained in the step (C) is subjected to annealing treatment. The chromium transition layer and the Al2O3 plating layer are sequentially compounded to the surface of the valve seat ring, and therefore the valve seat ring has high hardness, high heat stability and the low heat conductivity coefficient and friction coefficient, and the fatigue life of the valve seat ring is remarkably prolonged.

Description

Technical field [0001] The invention relates to the technical field related to engine parts, in particular to a valve seat ring and a preparation method thereof. Background technique [0002] The valve seat ring is the part where the intake and exhaust passages of the cylinder head or cylinder block are combined with the valve cone, and it has a corresponding cone. The valve seat ring relies on the tight fit between its inner cone surface and the valve cone surface to achieve cylinder sealing. [0003] With the continuous improvement of engine power and explosion pressure, the working conditions of the valve seat ring become more severe and need to withstand greater impact, wear, and erosion and oxidation after the combustion of combustible gas in a high-temperature environment. In view of this, the continuous development of the engine puts forward higher requirements for the characteristics of high temperature resistance, wear resistance and oxidation resistance of the valve seat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L3/04C23C14/30C23C14/35C23C14/16C23C14/08C23C14/58
CPCC23C14/0036C23C14/081C23C14/16C23C14/30C23C14/35C23C14/5806F01L3/04F01L2301/02
Inventor 辛延君王超张吉贤王慧芹程祥军张金芳
Owner WEICHAI POWER CO LTD