CN1201075A - Iron-base powder-metallurgy anti-friction structural material and preparation method therefor - Google Patents

Abstract

The iron-base antifriction structure material comprises the elements of Sn, Pb, Cu, Zn, S, C, Ni, Mo, Si, Cr, B and Fe, etc., and its preparation method includes the following steps: using a certain quantity of Sn-Pb alloy, QSn6-6-3, GHL-6-3 alloy, MoS2, S, C and iron powder as raw materials, mixing them, pressing, sintering, pressing again and secondary sintering again to obtain the invented product with good antifriction and mechanical properties.

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 4wt%～6wt% at added ingredients, Cu/Me is 7: 3, when sintering temperature is 900～950 ℃, have good comprehensive performances, alternative ZQan6-6-3 alloy under certain operating mode, but the mechanical property of this material still can not reach the corresponding index of tinbronze fully, therefore 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-based powder metallurgy anti-friction structural material, the chemical ingredients of this material (weight %) is: Sn 0.4～2.2%, Pb 0.4～2%, Cu1.5～5%, 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%, the 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 of Sn-Pb alloy (weight %) is Sn 40～50%, surplus is Pb, the QSn6-6-3 composition is Sn5～7%, Zn5～7%, Pb2～4%, surplus is Cu, and the 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 4～6T/cm ²

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

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

E: in 7～10T/cm ²Down compacting of pressure;

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 QSn6-6-3, self wear resisting property is higher 2～5 times than QSn6-6-3, influence and QSn6-6-3 to fricting couple piece are suitable, supporting capacity is 1.5～3 times of QSn6-6-3, 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 identical with tinbronze QSn6-6-3 (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%, the GHL-6-2 alloy: 2.5%, MoS ₂: 2%, S:0.8%, C:0.5%, the powder mixes of Yu Weitie, wherein the composition of Sn-Pb alloy (weight %) is Sn40%, surplus is Pb, the QSn6-6-3 composition is Sn5%, Zn5%, Pb2%, surplus is Cu, and the GHL-6-2 alloying constituent is Si 6.5%, and Cr 9%, Fe 6.5%, and B 1.8%, and surplus is Ni, above-mentioned each alloy material all makes with atomization, will mix back powder press forming in mould, and pressure is 5T/cm ²Under 200 ℃ temperature, just burn in sintering oven, kept temperature 30 minutes, hydrogen shield makes the 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; Again in mould in 8T/cm ²Down multiple pressure of pressure; In 850 ℃ of following resinterings 60 minutes, hydrogen shield made fully wetting other material of QSn6-6-3 again; In 1080 ℃ of following sintering 80 minutes, make the 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%, the GHL-6-2 alloy: 4%, MoS ₂: 1%, S:1.2%, C:1.2%, the powder mixes of Yu Weitie, wherein the composition of Sn-Pb alloy (weight %) is Sn 45%, surplus is Pb, the QSn6-6-S composition is Sn6%, Zn6%, Pb3%, surplus is Cu, and the GHL-6-2 alloying constituent is Si 6.5%, and Cr 10%, Fe 7%, and B 2%, and surplus is Ni, above-mentioned each alloy material all makes with atomization, will mix back powder press forming in mould, and pressure is 4T/cm ²Under 250 ℃ temperature, just burn in sintering oven, kept temperature 40 minutes, hydrogen shield makes the 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; Again in mould in 9T/cm ²Down multiple pressure of pressure; In 800 ℃ of following resinterings 40 minutes, hydrogen shield made fully wetting other material of QSn 6-6-3 again; In 1150 ℃ of following sintering 80 minutes, make the 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%, the GHL-6-2 alloy: 1%, MoS ₂: 3%, S:0.5%, C:0.2%, the powder mixes of Yu Weitie, wherein the composition of Sn-Pb alloy (weight %) is Sn 50%, surplus is Pb, QSn 6-6-3 composition is Sn 7%, and Zn 7%, and Pb 4%, surplus is Cu, and the GHL-6-2 alloying constituent is Si 7%, and Cr 10%, Fe 7%, and B 2.2%, and surplus is Ni, above-mentioned each alloy material all makes with atomization, will mix back powder press forming in mould, and pressure is 6T/cm ²Under 300 ℃ temperature, just burn in sintering oven, kept temperature 60 minutes, hydrogen shield makes the 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; Again in mould in 10T/cm ²Down multiple pressure of pressure; In 900 ℃ of following resinterings 60 minutes, hydrogen shield made fully wetting other material of QSn 6-6-3 again; In 1200 ℃ of following sintering 120 minutes, make the 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-based 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%, the 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 of Sn-Pb alloy (weight %) is Sn 40～50%, surplus is Pb, the QSn6-6-3 composition is Sn 5～7%, and Zn 5～7%, and Pb 2～4%, surplus is Cu, the GHL-6-2 alloying constituent is Si 6.5～7%, and Cr 9～10%, and Fe 6.5～7%, B 1.8～2.2%, and surplus is Ni;

B: will mix back powder press forming in mould, pressure is 4～6T/cm ²

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

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

E: in 7～10T/cm ²Down compacting of pressure;

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.