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Valve seat ring and preparation method thereof

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

Active Publication Date: 2017-01-04
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, comprising the following steps:

[0029] A), the surface of the valve seat substrate is pretreated;

[0030] B), adopt the method for electron beam evaporation, in the surface chromium plating layer of the valve seat ring base body that obtains in step A);

[0031] C), adopt the method for magnetron sputtering, in step B) obtain the chromium-plated layer surface deposition Al of the valve seat ring 2 o 3 Plating;

[0032] D), performing annealing treatment on the valve seat ring obtained in step C).

[0033] In the process of preparing the valve seat, this application sequentially deposits a transition layer of chromium and Al on the surface of the base of the valve seat by using electron beam evaporation and magnetron sputtering 2 o 3 Plating layer finally makes the valve seat ring have high strength, high thermal stability and low thermal conductivity and friction coefficient, which significa...

Embodiment 1

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

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

[0046] Step 3: The valve seat prepared in step 2 is magnetron sputtered, the target material is an Al target, oxygen is introduced, and Al is plated on the surface of the seat 2 o 3 Coating; when coating, the pressure in the vacuum chamber reaches 0.1-1Pa, the voltage is 3kv, and the electron beam current is 300mA, and the surface of the valve seat obtained in ste...

Embodiment 2

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

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

[0052] Step 3: The valve seat prepared in step 2 is magnetron sputtered, the target material is an Al target, oxygen is introduced, and Al is plated on the surface of the seat 2 o 3 Coating; when 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 seat obtained in step 2 is activated;...

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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 related technical field of engine accessories, 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 surface, and it has a corresponding cone surface. The valve seat ring realizes the cylinder seal by the tight fit between its inner cone surface and the valve cone surface. [0003] With the continuous improvement of engine power and explosion pressure, the working conditions of valve seat rings are more severe, and they need to withstand greater impact, wear, and erosion and oxidation after combustible gas combustion in a high-temperature environment. In view of this, the continuous development of the engine puts forward higher requirements for the high temperature resistance, wear resistance and oxidation resistance of the valve seat. ...

Claims

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Application Information

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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