阅读说明：本技术 一种高性能粉末冶金气门导管材料 (High-performance powder metallurgy valve guide pipe material ) 是由 王杰 孙进兵 刘晓春 陈伟 于 2021-07-02 设计创作，主要内容包括：本发明公开了一种高性能粉末冶金气门导管材料,包含有下述质量配比的元素原料：C：0.9％-1.8％、Ni：0.3％-1.0％、Mo：1.0％-5.0％、Cu：1.0％-4.0％、Mn：0.1％-8％、S：0.3％-1.2％、Fe：余量。本发明的气门导管材料有效的提高了粉末冶金导管的耐磨耗性能,可以应对恶劣的发动机工况,同时很好的改善了加工性能,节省了刀具成本。(The invention discloses a high-performance powder metallurgy valve guide pipe material which comprises the following element raw materials in parts by mass: c: 0.9% -1.8%, Ni: 0.3% -1.0%, Mo: 1.0% -5.0%, Cu: 1.0% -4.0%, Mn: 0.1% -8%, S: 0.3% -1.2%, Fe: and (4) the balance. The valve guide pipe material effectively improves the wear resistance of the powder metallurgy guide pipe, can deal with the severe working conditions of the engine, simultaneously well improves the processing performance and saves the cost of a cutter.)

1. The high-performance powder metallurgy valve guide pipe material is characterized by comprising the following element raw materials in parts by mass: c: 0.9% -1.8%, Ni: 0.3% -1.0%, Mo: 1.0% -5.0%, Cu: 1.0% -4.0%, Mn: 0.1% -8%, S: 0.3% -1.2%, Fe: and (4) the balance.

2. The high performance powder metallurgy valve guide material of claim 1, wherein: also contains P with the mass fraction not more than 4 percent.

3. The high performance powder metallurgy valve guide material of claim 1, wherein: and O with the mass fraction not more than 4 percent.

4. The high performance powder metallurgy valve guide material of claim 1, wherein: also contains P and O with the mass fraction not more than 4 percent.

5. The high performance powder metallurgy valve guide material of claim 1, wherein: mn and S are all added as MnS.

6. The high performance powder metallurgy valve guide material of claim 1, wherein: the Mn and S moieties are added as MnS.

7. The method for preparing the high-performance powder metallurgy valve guide material according to any one of claims 1 to 6, wherein the method comprises the following steps of:

(1) uniformly mixing the raw material powder according to the proportion;

(2) pressing and molding the mixed powder on a press;

(3) sintering the formed blank at high temperature in a sintering furnace;

(4) carrying out vacuum oil immersion treatment on the sintered product;

(5) and machining to obtain the finished product.

Technical Field

The invention relates to a valve guide pipe material, in particular to a high-performance powder metallurgy valve guide pipe material.

Background

The existing powder metallurgy valve guide pipe not only requires high wear resistance to meet the requirements of an engine, but also needs certain processability to be convenient for machining after being installed on a cylinder cover, but most of the existing powder metallurgy valve guide pipe materials are made of pure iron powder or alloy wear-resistant phases are added in the materials, or the existing powder metallurgy valve guide pipe materials are good in processability and insufficient in wear resistance, or the existing powder metallurgy valve guide pipe materials are good in wear resistance and poor in processing.

Disclosure of Invention

The invention aims to provide a high-performance powder metallurgy valve guide material which can improve the wear resistance and the processability.

In order to achieve the purpose, the invention provides the following technical scheme:

a high-performance powder metallurgy valve guide pipe material comprises the following element raw materials in parts by mass: c: 0.9% -1.8%, Ni: 0.3% -1.0%, Mo: 1.0% -5.0%, Cu: 1.0% -4.0%, Mn: 0.1% -8%, S: 0.3% -1.2%, Fe: and (4) the balance.

Preferably, the additive also contains P with the mass fraction not more than 4%.

Preferably, the additive also contains O with the mass fraction not more than 4%.

Preferably, P and O with the mass fraction not more than 4 percent are also contained.

Preferably, Mn and S are all added as MnS.

Preferably, the Mn and S moieties are added as MnS.

Preferably, the preparation method of the high-performance powder metallurgy valve guide material comprises the following steps:

(1) uniformly mixing the raw material powder according to the proportion;

(2) pressing and molding the mixed powder on a press;

(3) sintering the formed blank at high temperature in a sintering furnace;

(4) carrying out vacuum oil immersion treatment on the sintered product;

(5) and machining to obtain the finished product.

Compared with the prior art, the invention has the beneficial effects that:

1) according to the invention, a plurality of element raw materials are used for replacing pure iron powder, so that the wear resistance of the whole matrix is improved, and meanwhile, Ni, Mo, Cu, Mn and Fe alloy particles are added for dispersion strengthening, and the alloy particles are used as a wear-resistant phase to improve the wear resistance;

2) mn and S are added, and can be completely or partially added into the preparation of the new material in the form of MnS, and the MnS can be used as a solid lubricant to improve the processing performance, improve the self-lubricating performance of the material, improve the abrasion environment and improve the abrasion resistance;

3) the valve guide pipe material effectively improves the wear resistance of the powder metallurgy guide pipe, can deal with the severe working conditions of the engine, simultaneously well improves the processing performance and saves the cost of a cutter.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The valve guide material composition in this example is as follows:

element(s)

C

Ni

Mo

Cu

Mn

S

Others

Fe

The content wt%

1.2

0.6

3.3

2.38

0.4

7

3

Balance of

The others in the above table are P or O or P and O, and Mn and S are all added as MnS. The manufacturing process comprises the following steps: powder mixing → press forming → sintering → vacuum oil immersion treatment

The preparation method of the high-performance powder metallurgy valve guide material comprises the following steps:

(1) uniformly mixing the raw material powder according to the proportion;

(2) pressing and molding the mixed powder on a press;

(3) sintering the formed blank at high temperature in a sintering furnace;

(4) carrying out vacuum oil immersion treatment on the sintered product;

(5) and machining to obtain the finished product.

Example 2

The valve guide material composition of the invention in this example is as follows:

element(s)

C

Ni

Mo

Cu

Mn

S

Others

Fe

The content wt%

1.4

0.72

2.9

2.62

0.35

0.65

3

Balance of

The others in the table above are P or O or P and O, and Mn and S are all added as MnS, and the valve guide material is prepared in the same manner as in example 1.

Example 3

The valve guide material composition in this example is as follows:

element(s)

C

Ni

Mo

Cu

Mn

S

Others

Fe

The content wt%

1.3

0.7

3.2

2.85

0.3

0.7

4

Balance of

The others in the table above are P or O or P and O, and Mn and S are all added as MnS, and the valve guide material is prepared in the same manner as in example 1.

The valve guide reference material 5520 was used as a control, and the wear resistance test and the workability test were conducted in the control and examples 1 to 3 under the conditions of a temperature of 300 ℃ and a number of revolutions of 2500rpm for a test time of 10 hours in an abrasion tester. The results of the abrasion resistance test are shown in the following table:

valve guide material	Valve guide wear mm	Valve wear capacity mm	Total wear rate mm
				Reference material 5520	0.053	0.010	0.063
Example 1 materials	0.023	0.005	0.028
				Example 2 materials	0.025	0.004	0.029
Example 3 materials	0.025	0.005	0.030

The test conditions for the processability test are as follows: CBN cutter, revolution 2000rpm, feed 0.1 mm/r. The results of the workability tests are shown in the following table:

according to test data, the valve guide pipe material obtained in the embodiments 1-3 of the invention effectively improves the wear resistance of the powder metallurgy guide pipe, and can cope with severe engine working conditions. As can be seen from the machinability test, the invention improves the wear resistance of the material, and simultaneously, the quantity of the material which can be machined by the same cutter is in the same order of magnitude as the quantity of the traditional material which can be machined by the same cutter, therefore, the invention does not influence the machining performance and saves the cutter cost.

The foregoing is merely exemplary and illustrative of the present invention and various modifications, additions and substitutions may be made by those skilled in the art to the specific embodiments described without departing from the scope of the present invention as defined in the accompanying claims.