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A kind of tappet and its preparation method

A kind of equipment, magnetron sputtering technology, applied in the field of tappet and its preparation, can solve the problems of material hardness and infiltration layer unevenness, impact resistance weakening, temperature unevenness, etc., to increase fatigue resistance and reduce residual Stress, enhance the effect of interdiffusion

Active Publication Date: 2016-06-08
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional ordinary surface strengthening process, such as chrome plating on the surface, is thinner. Since the coating and the substrate are two kinds of metals, there is no transition layer. The traditional process often results in low adhesion of the coating, which is easy to fall off and the deposition film speed is low. ; while using the surface nitriding technology, due to the unreasonable furnace loading method and improper air pressure adjustment, uneven temperature during nitriding treatment, unreasonable air flow in the furnace, etc., the hardness and nitriding layer of the material obtained by the surface nitriding process uneven
In addition, due to the segregation of alloying elements at the grain boundary and the diffusion of nitrogen atoms, the surface layer of the mold is prone to reticular and corrugated, needle-like nitrides and thick white brittle layers after nitriding. Increased brittleness, weakened impact resistance, fatigue spalling, reduced wear resistance, greatly reducing the service life of the mold

Method used

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preparation example Construction

[0024] The embodiment of the present invention discloses a method for preparing a tappet, comprising the following steps:

[0025] a) placing the tappet substrate in a magnetron sputtering device, and preheating the tappet substrate after vacuuming;

[0026] b) activating the tappet obtained in step a);

[0027] c) Sputtering the tappet obtained in step b) by using a TiC target and a SiC target under a nitrogen atmosphere;

[0028] d) Annealing the tappet obtained in step c).

[0029] The preparation method of the tappet provided by the present invention is to use magnetron sputtering technology to treat the surface of the tappet, thereby obtaining a layer of composite layer on the surface of the tappet, so that the tappet has higher hardness, wear resistance and contact resistance fatigue performance.

[0030] According to the present invention, firstly, the tappet substrate is placed in the magnetron sputtering equipment, and the magnetron sputtering equipment is evacuate...

Embodiment 1

[0040] Step 1) Put the tappet substrate after degreasing and derusting on the special tooling rack in the magnetron sputtering equipment; vacuumize the magnetron sputtering equipment to a vacuum degree of 2×10 -3 Pa, then preheat the substrate to 300-500°C;

[0041] Step 2) Inject argon gas into the magnetron sputtering equipment. When the pressure in the magnetron sputtering vacuum chamber reaches 0.1-10Pa, the radio frequency current is 100-200A, and use argon plasma to treat the surface of the tappet obtained in step 1). bombardment activation;

[0042] Step 3) Introduce nitrogen gas into the vacuum chamber of the magnetron sputtering equipment, the partial pressure of nitrogen gas accounts for 50%, the deposition time is 80min, the target center distance is 60mm, the power of the magnetron sputtering target for the TiC target is 600W, and the magnetron sputtering target for the SiC target is 600W. The power of the sputtering target is 400W, and the TiSiCN anti-wear lubric...

Embodiment 2

[0046] Step 1) Put the degreased and derusted tappet substrate on the special tooling rack in the magnetron sputtering equipment; vacuum the magnetron sputtering equipment to a vacuum degree of 2×10 -3 Pa, then preheat the substrate to 300-500°C;

[0047] Step 2) Introduce argon gas into the magnetron sputtering equipment, when the pressure in the magnetron sputtering vacuum chamber reaches 0.1-10Pa, the radio frequency current is 100-200A, use argon plasma to treat the tappet substrate obtained in step 1) Surface activation by bombardment;

[0048] Step 3) Nitrogen gas is introduced into the vacuum chamber of the magnetron sputtering equipment, the partial pressure of nitrogen gas accounts for 55%, the deposition time is 90min, the target center distance is 80mm, the power of the magnetron sputtering target of the TiC target is 800W, and the magnetron sputtering target of the SiC target is 800W. The power of the sputtering target is 400W, and the TiSiCN anti-wear lubricating...

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PUM

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Abstract

The invention provides a preparation method of a tappet, which comprises the following steps: a) putting a tappet matrix in a magnetron sputtering device, preheating the tappet matrix after vacuum pumping; b) activating the tappet obtained by the step a); c) in N2 atmosphere, using a TiC target and a SiC target for sputtering the tappet obtained by the step b); and d) performing annealing treatment on the tappet obtained by the step c). According to the method, surface treatment of the tappet is performed by use of a sputtering method using TiC and SiC dual targets, and a TiSiCN composite layer is attached to the surface of the tappet, so that the hardness, wear resistance and contact fatigue resistance characteristics of the surface of the tappet are improved. The invention also provides the tappet, and the surface of the tappet is provided with the TiSiCN composite layer.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a tappet and a preparation method thereof. Background technique [0002] The valve tappet is a key part of the valve train of the automobile engine, and it is in direct contact with the camshaft during the operation of the engine. With the demand of exhaust brake, in order to make the engine work reliably, the exhaust valve spring force of the engine is nearly doubled compared with the state without exhaust brake. In addition, with the increase of power, the force that the tappet bears is also increasing, causing the tappet to be prone to severe wear, thereby affecting the reliability of the engine. [0003] At present, surface electroless plating technology, surface ion nitriding and welding cemented carbide and other technologies are widely used to modify the surface of materials. However, the traditional ordinary surface strengthening process, such as chrome plating ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/35C23C14/06C23C14/02C23C14/58C23F17/00
Inventor 辛延君王慧芹程祥军王洋杨玉霞
Owner WEICHAI POWER CO LTD