CN1060223C - Iron-base powder-metallurgy anti-friction structural material and preparation method therefor - Google Patents

Abstract

The present invention relates to an iron-base powder metallurgy antifriction structural material and a preparation method thereof. The material comprises elements, such as Sn, Pb, Cu, Zn, S, C, Ni, Mo, Si, Cr, B, Fe, etc. A certain amount of Sn-Pb alloy, QSn6-6-3 and GHL-6-3 alloy, MoS2, S, C, iron powder, etc. are mixed and are pressed, sintered, repressed and resintered into the iron-base powder metallurgy antifriction structural material. The material which is prepared by the provided method of the present invention has the advantages of good antifriction property and mechanical property, and can be widely used for the technical field of powder metallurgy.

Description

A kind of iron-base powder-metallurgy anti-friction structural material and preparation method thereof

The present invention relates to field of powder metallurgy, specifically a kind of iron-base powder-metallurgy anti-friction structural material and preparation method thereof.

At present, the employed antifriction material mechanical property in ferrous based powder metallurgical field is relatively poor, " research of Fe-Cu-Me iron-based antifriction material " (" powder metallurgy technology " the 14 volume second phase, P127～131, author: Wu Qingding, 1996, the publication of editorial office of Beijing Powder Metallurgy Inst.'s " powder metallurgy technology ") literary composition discloses a kind of antifriction material and preparation method, this material is that Cu+Me is 4%-6% (weight ratio) at added ingredients, Cu/Me is 7: 3, when sintering temperature is 900～950 ℃, has good comprehensive performances, alternative ZQsn6-6-3 alloy under certain operating mode, but the mechanical property of this material still can not reach the corresponding index of tinbronze fully, so its range of application is subjected to certain restriction, and the structured material of using at present, as Fe-Cu-Ni-C system etc., antifriction performance is very poor again.

Purpose of the present invention is exactly the shortcoming that overcomes existing antifriction material and structured material, and a kind of antifriction material antifriction performance and structured material iron-base powder-metallurgy anti-friction structural material and preparation method thereof of mechanical property preferably preferably that possesses simultaneously is provided.

For achieving the above object, the invention provides a kind of iron-base powder-metallurgy anti-friction structural material, the chemical ingredients of this material (weight %) is: Sn 0.4～2.2%, Pb 0.4～2%, Cu1.5～6%, and Zn 0.1～0.5%, S 0.2～0.8%, C 0.2～1%, and Ni 0.75～3%, and Mo 0.5～2%, Si 0.25～0.75%, Cr0.25～0.75%, B 0.25～0.75%, and surplus is Fe.

The present invention provides the preparation method of this iron-base powder-metallurgy anti-friction structural material simultaneously, and this method follows these steps to carry out:

A: with (weight ratio %) Sn-Pb alloy: 1～5%, QSn 6-6-3:2～8%, GHL-6-3 alloy: 1～4%, MoS ₂: 1～3%, S:0.4～1.2%, C:0.2～1.2%, the powder mixes of Yu Weitie, wherein the composition (weight %) of Sn-Pb alloy is Sn 40～50%, surplus is Pb, QSn 6-6-3 compositions are Sn5～7%, and Zn 5～7%, and Pb 2～4%, surplus is Cu, and GHL-6-2 alloying constituent is Si 6.5～7%, and Cr 9～10%, Fe 6.5～7%, B 1.8～2.2%, and surplus is Ni, and above-mentioned each alloy material all makes with atomization;

B: will mix back powder press forming in mould, pressure is 400-600MPa;

C: in 200～300 ℃ sintering temperatures 30～60 minutes;

D: in 700～800 ℃ sintering temperatures 60～120 minutes;

E: in the pressure compacting down of 700-1000MPa;

F: in 800～900 ℃ of following sintering 30～60 minutes;

G: in 1000～1200 ℃ of following sintering 60～120 minutes, slow cooling was come out of the stove;

Above-mentioned each sintering step is all made protection atmosphere with hydrogen or cracked ammonium.

This material in normal working conditions, as metal to-metal contact Pv=2kgm/cm ²S, oil lubricating Pv=18kgm/cm ²S, frictional coefficient is less than tinbronze QSn 6-6-3, self wear resisting property is higher 2～5 times than QSn 6-6-3, influence to fricting couple piece is suitable with QSn 6-6-3, supporting capacity is 1.5～3 times of QSn 6-6-3, These parameters adopts the test of national standard MM-200 type frictional testing machines, and tensile strength can reach 260～450MPa (GB7963-87), and impelling strength is 18～22J/Ccm ²(GB5318-85), Bu Shi intensity is HB80～140 (JB2867-86), density 6.6～7.2g/cm ³(GB5163-35), the turning surface roughness reaches as high as (adopting relative method to survey), corrosion resistance nature and tinbronze QSn 6-6-3 identical (gravimetry loss in 5% acid, alkali, three kinds of solution of salt).

Embodiment:

1, with (weight ratio %) Sn-Pb alloy: 2%, QSn 6-6-3:3%, GHL-6-2 alloy: 2.5%, MoS ₂: 2%, S:0.8%, C:0.5%, the powder mixes of Yu Weitie, wherein the composition (weight %) of Sn-Pb alloy is Sn40%, surplus is Pb, QSn 6-6-3 compositions are Sn5%, Zn5%, Pb2%, surplus is Cu, and GHL-6-2 alloying constituent is Si6.5%, Cr9%, Fe6.5%, B1.8%, surplus is Ni, above-mentioned each alloy material all makes with atomization, will mix back powder press forming in mould, and pressure is 500MPa; Under 200 ℃ temperature, just burn in sintering oven, kept temperature 30 minutes, hydrogen shield makes Sn-Pb alloy melting, and wetting other material, produces alloy part; Then in 700 ℃ sintering temperature 70 minutes, the work hardening that produces when eliminating compacting; In mould, under the pressure of 800MPa, press again again; In 850 ℃ of following resinterings 60 minutes, hydrogen shield made QSn 6-6-3 abundant wetting other materials again; In 1080 ℃ of following sintering 80 minutes, make GHL-6-2 alloy melting then, the reinforced alloys effect, slow cooling is come out of the stove.

2, with (weight ratio %) Sn-Pb alloy: 1%, QSn 6-6-3:6%, GHL-6-2 alloy: 4%, MoS ₂: 1%, S:1.2%, C:1.2%, the powder mixes of Yu Weitie, wherein the composition (weight %) of Sn-Pb alloy is Sn 45%, surplus is Pb, QSn 6-6-3 compositions are Sn 6%, and Zn 6%, and Pb 3%, surplus is Cu, and GHL-6-2 alloying constituent is Si6.5%, Cr10%, Fe7%, B2%, surplus is Ni, above-mentioned each alloy material all makes with atomization, will mix back powder press forming in mould, and pressure is 400MPa; Under 250 ℃ temperature, just burn in sintering oven, kept temperature 40 minutes, hydrogen shield makes Sn-Pb alloy melting, and wetting other material, produces alloy part; Then in 750 ℃ sintering temperature 100 minutes, the work hardening that produces when eliminating compacting; In mould, under the pressure of 900MPa, press again again; In 800 ℃ of following resinterings 40 minutes, hydrogen shield made QSn 6-6-3 abundant wetting other materials again; In 1150 ℃ of following sintering 80 minutes, make GHL-6-2 alloy melting then, the reinforced alloys effect, slow cooling is come out of the stove.

3, with (weight ratio %) Sn-Pb alloy: 5%, QSn 6-6-3:3%, GHL-6-2 alloy: 1%, MoS ₂: 3%, S:0.5%, C:0.2%, the powder mixes of Yu Weitie, wherein the composition (weight %) of Sn-Pb alloy is Sn 50%, surplus is Pb, QSn 6-6-3 compositions are Sn7%, Zn7%, Pb4%, surplus is Cu, and GHL-6-2 alloying constituent is Si7%, Cr10%, Fe7%, B2.2%, surplus is Ni, above-mentioned each alloy material all makes with atomization, will mix back powder press forming in mould, and pressure is 600MPa; Under 300 ℃ temperature, just burn in sintering oven, kept temperature 60 minutes, hydrogen shield makes Sn-Pb alloy melting, and wetting other material, produces alloy part; Then in 800 ℃ sintering temperature 120 minutes, the work hardening that produces when eliminating compacting; In mould, under the pressure of 1000MPa, press again again; In 900 ℃ of following resinterings 60 minutes, hydrogen shield made QSn 6-6-3 abundant wetting other materials again; In 1200 ℃ of following sintering 120 minutes, make GHL-6-2 alloy melting then, the reinforced alloys effect, slow cooling is come out of the stove.

Claims (2)

1, a kind of iron-base powder-metallurgy anti-friction structural material, it is characterized in that the chemical ingredients (weight %) of this material is: Sn 0.4～2.2%, and Pb 0.4～2%, Cu 1.5～5%, Zn0.1～0.5%, S 0.2～0.8%, and C 0.2～1%, Ni 0.75～3%, Mo 0.5～2%, and Si 0.25～0.75%, and Cr 0.25～0.75%, B0.25～0.75%, surplus are Fe.

2, a kind of method for preparing the described iron-base powder-metallurgy anti-friction structural material of claim 1 is characterized in that this method follows these steps to carry out:

A: with (weight ratio %) Sn-Pb alloy, 1～5%, QSn 6-6-3:2～8%, GHL-6-3 alloy: 1～4%, MoS ₂: 1～3%, S:0.4～1.2%, C:0.2～1.2%, the powder mixes of Yu Weitie, wherein the composition (weight %) of Sn-Pb alloy is Sn 40～50%, surplus is Pb, QSn 6-6-3 compositions are Sn 5～7%, and Zn 5～7%, and Pb 2～4%, surplus is Cu, GHL-6-2 alloying constituent is Si 6.5～7%, and Cr 9～10%, and Fe 6.5～7%, B 1.8～22%, and surplus is Ni;

B: will mix back powder press forming in mould, pressure is 400-600MPa;

C: in 200～300 ℃ sintering temperatures 30～60 minutes;

D: in 700～800 ℃ sintering temperatures 60～120 minutes;

E: in the pressure compacting down of 700-1000MPa;

F: in 800～900 ℃ of following sintering 30～60 minutes;

G: in 1000～1200 ℃ of following sintering 60～120 minutes, slow cooling was come out of the stove;

Above-mentioned each sintering step is all made protection atmosphere with hydrogen or cracked ammonium.