CN103639405A

CN103639405A - Metal matrix high temperature self-lubricating composite material and manufacturing method thereof

Info

Publication number: CN103639405A
Application number: CN201310637207.5A
Authority: CN
Inventors: 唐华; 张坤; 李长生; 张杜
Original assignee: Jiangsu University
Current assignee: Jiangsu University
Priority date: 2013-12-03
Filing date: 2013-12-03
Publication date: 2014-03-19

Abstract

The invention relates to the field of high temperature self-lubricating materials, in particular to a metal matrix high temperature self-lubricating composite material and manufacturing method thereof. From the view of material design, Ni, Mo and the like are added into an iron-copper alloy matrix to improve abrasion resistance of the matrix, meanwhile graphite, molybdenum disulfide and the like are added for lubrication to improve self-lubricating performance of a material, a scientific composition is formed, and under the powder metallurgy preparation process, a composite material with good mechanical performance and self-lubricating performance is prepared, and the requirement for friction and abrasion performance under different working conditions can be met. The metal matrix high temperature self-lubricating composite material can be widely applied to the field of aerospace, machinery, automobiles, military projects and the like.

Description

A kind of Metal Substrate high temperature self-lubricating composite material and preparation method thereof

Technical field

The present invention relates to high temperature self-lubricating composite field, specifically relate to a kind of Metal Substrate high temperature self-lubricating composite material and preparation method thereof.

Background technology

Along with developing rapidly of modern industrial technology, for meeting the lubrication antifriction demand of engineering machinery under harsh conditions, general method is to use lubricating oil or lubricating grease, but at high temperature, vacuum, at a high speed, heavy duty, be difficult for forming under the severe specific conditions such as lubricating oil film, kollag has obvious advantage at friction field, at manufacturing machine, household electrical appliance, office equipment, precision instrument, the field such as facilities for transport and communication and military equipment, Metal Substrate solid lubricant such as all plays a very important role at the field, Metal Substrate solid lubricant all plays a very important role.

The Fe based self lubricating composites that contains kollag (molybdenum bisuphide, graphite etc.) has excellent friction and wear behavior, be widely used in industrial circle, as in fields such as manufacturing machine, precision instrument, facilities for transport and communication and military equipments, all play an important role, therefore need to design the more excellent lubriation material of mechanical performance and frictional behaviour significant.For deficiency of the prior art, the invention provides a kind of novel metal based self lubricated composite material with high-temperature wearable and self-lubricating property and preparation method thereof, utilize powder metallurgy technology of preparing, various one-tenth by material are grouped into science design, performance ferroalloy matrix, wild phase, solid lubrication equate system matches effect, and research obtains has metal-based self-lubricating composite material and the preparation advanced technology thereof that meets oil-free lubrication friction parts under different application working condition.

Summary of the invention

A Metal Substrate high temperature self-lubricating composite material, its composition comprises by mass percentage:

Water-atomized iron powder 40% ~ 70%;

Ni 5%~10%；

Mo 5%~10%；

Cr 1%~10%；

W 1%~5%；

Cu 10%~15%；

Graphite 2% ~ 5%;

MoS ₂1%~7%；

Sodium metasilicate 3%.

Wherein, the purity of water-atomized iron powder, nickel, molybdenum, chromium, tungsten and copper is all greater than 99.95wt%, grain graininess 200 orders; Graphite, molybdenum bisuphide purity are greater than 99.5wt%, grain graininess 200 orders; Iron powder is water-atomized iron powder.

A kind of Metal Substrate high temperature self-lubricating composite material and preparation method thereof of preparing, carries out according to following steps.

(1) by mass percentage: water-atomized iron powder 40% ~ 70%, nickel 5% ~ 10%, molybdenum 5% ~ 10%, chromium 1% ~ 10%, tungsten 1% ~ 5%, copper 10% ~ 15%, graphite 2% ~ 5%, molybdenum bisuphide 1% ~ 7% fully mix mixing time 8h in mixer.

(2) sodium metasilicate and water are mixed to get the aqueous solution of sodium metasilicate, and sodium metasilicate, is poured afterwards stirrer for mixing into and stirred than being 1:2 with water quality, mixing time 2h, and the addition of the aqueous solution of sodium metasilicate is 3% of batch mixing quality.

(3) mixed-powder after mix and blend is dry in drying box, 40 ℃ of baking temperatures.

(4) warm compaction molding: dried mixed-powder and mould etc. are heated to 130 ℃ ~ 150 ℃, and compressing, pressure is 600MPa ~ 800MPa.

(5) in vacuum drying oven, sintering can obtain high temperature self-lubricating composite material, and sintering temperature is 1150 ℃, and 5 ~ 10 ℃/min of programming rate is incubated 1 ~ 2h from room temperature rises to sintering temperature, and vacuum is 0.01 ~ 0.02Pa.

Product after sintering carries out machine-shaping as requested.

Feature of the present invention and beneficial effect are:

The present invention is from design of material angle, in iron-copper matrix, add Ni, Mo etc. to strengthen the wearability of matrix, simultaneously, the solid lubrication such as interpolation graphite, molybdenum bisuphide improve the self-lubricating property of material mutually, the one-tenth of formation science is grouped into, and under powder metallurgy preparation technology, prepare the composite with excellent mechanical performances and self-lubricating property, can meet under different working conditions friction and wear behavior requirement, can be widely used in Aero-Space, the fields such as machinery, automobile and military project.

Accompanying drawing explanation

Fig. 1 is the coefficient of friction figures of example 1,2,3,4 composites at 400 ℃.

Fig. 2 is that the high-temperature composite material gold of example 3 is as scintigram.

The specific embodiment

Below in conjunction with specific embodiment, technical scheme of the present invention is further illustrated, should not be considered as concrete restriction of the present invention.

Embodiment

The metal-based self-lubricating composite material of the present embodiment is comprised of following mass percent component:

Table 1 is for adding composition and the preparation condition of the high-temperature wear-resisting self-lubricating composite of graphite and MoS2

Compressing pressure in embodiment 1-4 is 700 MPa, and sintering temperature is 1150, insulation 2h, vacuum 0.01 Pa.

This high-temperature self-lubrication is met to material and carry out mechanical property, tribological property test, probe temperature of the present invention is 400 ℃.

The PVvalue testing figure of the composite that accompanying drawing 1 obtains for the present invention under 400 ℃ of high temperature, in conjunction with above-mentioned performance test, high temperature self-lubricating composite material of the present invention at high temperature has excellent mechanical property, coefficient of friction is less, wear rate is lower, when at high temperature thering is good anti-wear performance, realized the effect of self-lubricating.

Applicant's statement, the present invention illustrates detailed composition of the present invention and preparation method by above-mentioned example, but the present invention is not not limited to above-mentioned detailed composition and preparation method, do not mean that the present invention must rely on above-mentioned detailed composition and preparation method could implement; Person of ordinary skill in the field should understand, any improvement in the present invention, to each raw material of product of the present invention equivalence replace and the interpolation of auxiliary element, the selection of concrete mode etc., within all dropping on protection scope of the present invention and open scope.

Claims

1. a Metal Substrate high temperature self-lubricating composite material, is characterized in that: the composition of described composite is by mass percentage:

Water-atomized iron powder 40% ~ 70%;

Ni 5%~10%；

Mo 5%~10%；

Cr 1%~10%；

W 1%~5%；

Cu 10%~15%；

Graphite 2% ~ 5%;

MoS ₂1%~7%；

Sodium metasilicate 3%.

2. a kind of Metal Substrate high temperature self-lubricating composite material as claimed in claim 1, is characterized in that: the purity of described water-atomized iron powder, nickel, molybdenum, chromium, tungsten and copper is all greater than 99.95wt%, grain graininess 200 orders; Graphite, molybdenum bisuphide purity are greater than 99.5%, grain graininess 200 orders.

3. the preparation method of a kind of Metal Substrate high temperature self-lubricating composite material as claimed in claim 1, is characterized in that comprising the steps:

(1) by mass percentage: water-atomized iron powder 40% ~ 70%, nickel 5% ~ 10%, molybdenum 5% ~ 10%, chromium 1% ~ 10%, tungsten 1% ~ 5%, copper 10% ~ 15%, graphite 2% ~ 5%, molybdenum bisuphide 1% ~ 7%, batch mixing in mixer;

(2) sodium metasilicate and water are mixed to get the aqueous solution of sodium metasilicate, and sodium metasilicate, is poured afterwards stirrer for mixing into and stirred than being 1:2 with water quality;

(3) mixed-powder after mix and blend is dry in drying box;

(4) warm compaction molding: dried mixed-powder and mould etc. are heated to 130 ℃ ~ 150 ℃, compressing;

(5) in vacuum drying oven, sintering obtains described Metal Substrate high temperature self-lubricating composite material.

4. the preparation method of a kind of Metal Substrate high temperature self-lubricating composite material as claimed in claim 3, is characterized in that: the mixing time in described step 1 is 8h.

5. the preparation method of a kind of Metal Substrate high temperature self-lubricating composite material as claimed in claim 3, is characterized in that: the mixing time in described step 2 is 2h; The addition of the aqueous solution of sodium metasilicate is 3% of batch mixing quality.

6. the preparation method of a kind of Metal Substrate high temperature self-lubricating composite material as claimed in claim 3, is characterized in that: the baking temperature in described step 3 is 40 ℃.

7. the preparation method of a kind of Metal Substrate high temperature self-lubricating composite material as claimed in claim 3, is characterized in that: in described step 4, compressing pressure is 600MPa ~ 800MPa.

8. the preparation method of a kind of Metal Substrate high temperature self-lubricating composite material as claimed in claim 3, the technological parameter that it is characterized in that described vacuum-sintering is: sintering temperature is 1150 ℃, 5 ~ 10 ℃/min of programming rate, from room temperature rises to sintering temperature, be incubated 1 ~ 2h, vacuum is 0.01 ~ 0.02Pa.