阅读说明：本技术 一种增加耐高温及耐腐蚀的粉末冶金座圈材料 (Powder metallurgy seat ring material with increased high temperature resistance and corrosion resistance ) 是由 严云飞 冯友蓬 于 2020-12-30 设计创作，主要内容包括：本发明公开了一种增加耐高温及耐腐蚀的粉末冶金座圈材料,所述该材料包括碳、铜、铬、钼、钴和铁,且该材料由如下质量百分比原料制成：0.67～1.58wt%的碳；8.0～21.0wt%的铜；4.5～11.0wt%的铬；3.9～11.0wt%的钼；4.85～10.88wt%钴；余量为铁；所述铁采用原铁粉,碳采用碳粉,所述该材料生产出的座圈材料硬度：28-55 HRC,材料密度：7.1-8.4g/cm3,压馈强度：≥680Mpa,配粉前所述碳粉必须烘干处理,其中烘干温度为200摄氏度,烘干4小时,原铁粉要求：松装密度在2.5-3.2之间；综上所述,借助本发明上述的技术方案配比,在使用上述材料进行配比制作的适用于柴油机、天然气发动机的气门座圈,增加耐高温、耐腐蚀、耐磨强化组织,增加其使用的寿命,减少了使用的成本。(The invention discloses a powder metallurgy seat ring material with increased high temperature resistance and corrosion resistance, which comprises carbon, copper, chromium, molybdenum, cobalt and iron, and is prepared from the following raw materials in percentage by mass: 0.67 to 1.58wt% carbon; 8.0 to 21.0wt% of copper; 4.5 to 11.0wt% of chromium; 3.9-11.0 wt% molybdenum; 4.85-10.88 wt% cobalt; the balance being iron; the iron is raw iron powder, the carbon is carbon powder, and the hardness of the seat ring material produced by the material is as follows: 28-55 HRC, material density: 7.1-8.4g/cm3, pressure feed strength: not less than 680Mpa, the carbon powder must be dried before powder preparation, wherein the drying temperature is 200 ℃, the drying time is 4 hours, and the raw iron powder requires: the loose packed density is between 2.5 and 3.2; in summary, by means of the technical scheme of the invention, the valve seat ring which is manufactured by using the materials in proportion and is suitable for diesel engines and natural gas engines is added with high-temperature-resistant, corrosion-resistant and wear-resistant reinforced structures, the service life of the valve seat ring is prolonged, and the use cost is reduced.)

1. The utility model provides an increase high temperature resistant and corrosion-resistant powder metallurgy seat circle material which characterized in that: the material comprises carbon, copper, chromium, molybdenum, cobalt and iron, and is prepared from the following raw materials in percentage by mass:

0.67 to 1.58wt% carbon;

8.0 to 21.0wt% of copper;

4.5 to 11.0wt% of chromium;

3.9-11.0 wt% molybdenum;

4.85-10.88 wt% cobalt;

the balance being iron.

2. The powder metallurgy seat ring material with the increased high temperature resistance and the increased corrosion resistance of claim 1, wherein: the hardness of the race material produced by the material is as follows: 28-55 HRC, material density: 7.1-8.4g/cm3, pressure feed strength: not less than 680 MPa.

3. The powder metallurgy seat ring material with the increased high temperature resistance and the increased corrosion resistance of claim 1, wherein: the iron is raw iron powder, and the carbon is carbon powder.

4. The powder metallurgy seat ring material with the increased high temperature resistance and the increased corrosion resistance of claim 3, wherein: before powder preparation, the carbon powder must be dried, wherein the drying temperature is 200 ℃, the drying time is 4 hours, and the raw iron powder requires: the loose packed density is between 2.5 and 3.2.

Technical Field

The invention belongs to the technical field, and particularly relates to a powder metallurgy seat ring material with increased high temperature resistance and corrosion resistance.

Background

The valve seat insert mainly functions to seal the valve and withstand high-speed impact, and the physical properties and mechanical properties of the material must be considered in material selection. The powder metallurgy material has the advantages of high forming size precision, flexible alloy selection and sintering post-treatment process, obvious raw material, labor hour and energy saving and the like, so compared with other materials, the powder metallurgy material has obvious competitiveness and is increasingly widely applied to internal combustion engines, and the seat ring produced by the novel powder metallurgy material is a trend.

Disclosure of Invention

The invention aims to provide a powder metallurgy seat ring material with increased high temperature resistance and corrosion resistance, so as to solve the problems in the background technology. The invention provides a powder metallurgy seat ring material with increased high temperature resistance and corrosion resistance.

In order to achieve the purpose, the invention provides the following technical scheme: the powder metallurgy seat ring material with the increased high temperature resistance and corrosion resistance comprises carbon, copper, chromium, molybdenum, cobalt and iron, and is prepared from the following raw materials in percentage by mass:

0.67 to 1.58wt% carbon;

8.0 to 21.0wt% of copper;

4.5 to 11.0wt% of chromium;

3.9-11.0 wt% molybdenum;

4.85-10.88 wt% cobalt;

the balance being iron.

Further in the present invention, the material produces a race material hardness: 28-55 HRC, material density: 7.1-8.4g/cm3, pressure feed strength: not less than 680 MPa.

In the invention, the iron is raw iron powder, and the carbon is carbon powder.

Further, the carbon powder must be dried before powder preparation, wherein the drying temperature is 200 ℃, the drying time is 4 hours, and the raw iron powder requires: the loose packed density is between 2.5 and 3.2.

In summary, by means of the technical scheme of the invention, the valve seat ring which is manufactured by using the materials in proportion and is suitable for diesel engines and natural gas engines is added with high-temperature-resistant, corrosion-resistant and wear-resistant reinforced structures, the service life of the valve seat ring is prolonged, and the use cost is reduced.

Drawings

Fig. 1 is a schematic metallographic structure diagram in an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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

Referring to fig. 1, the present invention provides the following technical solutions: the powder metallurgy seat ring material with the increased high temperature resistance and corrosion resistance comprises carbon, copper, chromium, molybdenum, cobalt and iron, and is prepared from the following raw materials in percentage by mass:

0.67wt% carbon;

8.0wt% copper;

4.5wt% chromium;

3.9wt% molybdenum;

4.85wt% cobalt;

the balance being iron.

Further, the material produces a race material hardness: 28-55 HRC, material density: 7.1-8.4g/cm3, pressure feed strength: not less than 680 MPa.

Further, the iron is raw iron powder, and the carbon is carbon powder.

Further, the carbon powder must be dried before powder preparation, wherein the drying temperature is 200 ℃, the drying time is 4 hours, and the raw iron powder requires: the loose packed density is between 2.5 and 3.2.

Example 2

Referring to fig. 1, the present invention provides the following technical solutions: the powder metallurgy seat ring material with the increased high temperature resistance and corrosion resistance comprises carbon, copper, chromium, molybdenum, cobalt and iron, and is prepared from the following raw materials in percentage by mass:

9.1wt% carbon;

13wt% copper;

6.5wt% chromium;

7.1wt% molybdenum;

6.03wt% cobalt;

the balance being iron.

Further, the material produces a race material hardness: 28-55 HRC, material density: 7.1-8.4g/cm3, pressure feed strength: not less than 680 MPa.

Further, the iron is raw iron powder, and the carbon is carbon powder.

Further, the carbon powder must be dried before powder preparation, wherein the drying temperature is 200 ℃, the drying time is 4 hours, and the raw iron powder requires: the loose packed density is between 2.5 and 3.2.

Example 3

Referring to fig. 1, the present invention provides the following technical solutions: the powder metallurgy seat ring material with the increased high temperature resistance and corrosion resistance comprises carbon, copper, chromium, molybdenum, cobalt and iron, and is prepared from the following raw materials in percentage by mass:

1.58wt% carbon;

21.0wt% copper;

11.0wt% chromium;

11.0wt% molybdenum;

10.88wt% cobalt;

the balance being iron.

Further, the material produces a race material hardness: 28-55 HRC, material density: 7.1-8.4g/cm3, pressure feed strength: not less than 680 MPa.

Further, the iron is raw iron powder, and the carbon is carbon powder.

Further, the carbon powder must be dried before powder preparation, wherein the drying temperature is 200 ℃, the drying time is 4 hours, and the raw iron powder requires: the loose packed density is between 2.5 and 3.2.

The metallographic structure is shown in fig. 1, and the metallographic structure in the drawing is as follows: the matrix consists of tempered martensite, hard phase, copper and solid lubricant.

The manufacturing method comprises the following steps of:

1. powder preparation

Before powder preparation, the carbon powder must be dried (200 ℃, 4 hours for drying);

the iron powder requires: the loose packed density is between 2.5 and 3.2;

high-speed steel base powder requirement: between-200 mesh and-320 mesh, at a flow rate of 50G, 30S, after heat treatment, tempering (finished by the raw material manufacturer);

other powder material requirements are as follows: between-200 mesh and-320 mesh;

2. mixing powder: uniformly mixing the prepared powder, wherein the equipment adopts a VI-300/VI-200 type mixer, and the copper contained in the material is independently mixed powder;

3. pressing: and (3) pressing the mixed finished product powder into a product blank device: 60T-100T of powder pressing forming machine; the material contained copper and was pressed separately as a copper sheet. Equipment: and 20T-100T of a powder compacting forming machine.

4. And (3) sintering: and continuously sintering at 680-1200 ℃ for 5-9 hours, stacking the product blank and the copper sheet for 2-10 layers, and when the temperature is higher than 1083 ℃, melting the copper sheet and infiltrating the pores of the product blank into the product so as to fill the pores which cannot be completely eliminated when the product is pressed, so that the product achieves the high-temperature resistance, corrosion resistance and wear resistance strengthening performance.

5. And (3) cold treatment: eliminating the internal stress of the product at-200 to-120 ℃ for 1 to 2 hours, and the equipment comprises the following steps: cryogenic treatment equipment

6. Tempering, namely improving the toughness of the product, optimizing the physical properties of the product, wherein the tempering temperature is 500 ℃ and 750 ℃, and the equipment comprises the following steps: and (5) annealing at a high temperature.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.