CN1141959A

CN1141959A - Technology of split pressing one-time compounding for composite iron-base alloy of powdered metallurgy of tin and bronze

Info

Publication number: CN1141959A
Application number: CN 95110584
Authority: CN
Inventors: 陈刚; 苗毅
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-08-01
Filing date: 1995-08-01
Publication date: 1997-02-05
Anticipated expiration: 2015-08-01
Also published as: CN1054649C

Abstract

Iron-base powder which contains 2-15% of copper, 1-6% of lead, 0.5-3% of tin, 0.1-3% of carbon, 0.2-12% of sulfur and rest of iron powder, firstly is pressed into shape, then sintered for 1-3 hours under the temp. of 1050-1250 degree C to make a iron sleeve, secondary, tin bronze powder is pressed into shape, and sintered for 1-3 hours under the temp. of 750-850 degree C to make a copper sleeve, then said copper sleeve and iron sleeve are compounded under the temp. of 750-850 degree C. The process has the advantage of low cost of material, high mechanical properties, which can be widely used in mfg. of bush for textile, light industry and building machines and other components.

Description

Composite iron-base alloy of powdered metallurgy of tin and bronze split pressing one-time recombining process

The present invention relates to the powder metallurgy double-metal composite technique, the compound iron-based powder technology of specifically a kind of powdered metallurgy of tin and bronze.

At present, when making bimetallic material, mainly adopt following several method:

(1) spreading Cu-base powder on steel plate carries out sintering, rolling then, again the two metal plates that make is rolled into round-formed semicircle;

(2) cast recombining process etc.

Aforesaid method has all obtained practical application to a certain extent, but also exists certain limitation and weak point, and for example first method is strict to plate quality, a complete set of complex process, and cost is higher; Second method is difficult to the precision and the stable quality that reach higher, also is not easy to the postorder processing of goods.In addition, also has a kind of diffusion welding connection, this technology is that prefabricated copper sheathing is pressed into the steel body, heating at a certain temperature then, make copper base alloy and steel body produce diffusion and weld together, but this technology is low to material use efficiency, and processing parameter is difficult to control, the product performance instability that is processed into is so its range of application is subjected to certain limitation.

The object of the invention is exactly the shortcoming that overcomes above-mentioned technology, provide a kind of be manufactured on non-working surface with iron-based powder for copper, and mechanical property is higher, and possesses the novel process of tinbronze performance part fully at working face.

For achieving the above object; the compound iron-based powder technology of a kind of powdered metallurgy of tin and bronze; it is respectively charged into mould with tinbronze powder and iron-based powder earlier; then by compacting; sintering; shaping; make iron cover and copper sheathing; protective atmosphere during sintering is nitrogen or hydrogen or cracked ammonium; again that iron cover and copper sheathing is compound; make required part by auxiliary machinery processing at last; it is characterized in that iron-based powder composition (weight) is a 2-15% copper; 1-6% lead; 0.5-3% tin; 0.1-3% carbon; 0.2-1.2% sulphur; surplus is iron powder; in iron is enclosed within; copper sheathing is outside the time; the tinbronze powder adopts alloy powder, and copper sheathing is interior; when iron overlapped outside, the tinbronze powder adopted and closes batch powder; after iron cover and condom were fitted together, complex sintered temperature was 750-850 ℃.

The present invention is owing to add suitable alloying element in iron powder, thereby can be compound under lower temperature, the bimetal junction surface produces atomic diffusion, and binding ratio is more firm, and part iron-based position intensity height, the performance of making are good, have higher mechanical properties.

The present invention will be further described below in conjunction with embodiment.

Implement 1: with (weight) 2% bronze medal, 1% lead, 0.5% tin, 0.1% carbon, 0.2% sulphur; 96.2% iron powder is put into the powder machine that mixes; add proper amount of machine oil and Zinc Stearate simultaneously; mixed 0.5-2 hour; the mould of then the blended iron-based powder being packed into, press forming under 500-800MPa, with the ironware that suppresses in 1050-1250 ℃ of following sintering 1-3 hour; protective atmosphere is a hydrogen, makes required iron cover through shaping again.With label is the tinbronze powder of Qsn-6-6-3 another mould of packing into, and press forming under 400-600MPa is then in 750-850 ℃ of sintering 1-3 hour; protective atmosphere is a hydrogen, and required copper sheathing is made in shaping again, in order to guarantee the generation of compound tense interfacial pressure; copper sheathing is under interior situation, and the tinbronze powder adopts and closes batch powder, under the copper sheathing situation outside; adopt alloy powder, when complex sintered, during the outer iron of interior copper; the copper layer expands; during the outer copper of interior iron, the copper layer shrinks, thereby bonding surface intensity is increased.Iron cover and copper sheathing were assembled together in 750 ℃ of following sintering 2-3 hours, and protective atmosphere is a hydrogen, makes required part by auxiliary machinery processing then, and the part iron part intensity that processes can reach 254MPa, and junction surface intensity can reach 80MPa.

Embodiment 2: with (weight) 15% bronze medal, 6% lead, 3% tin, 3% carbon, 1.2% sulphur; 71.8% iron powder is put into the powder machine that mixes; add proper amount of machine oil and Zinc Stearate simultaneously; mixed 0.5-2 hour; the mould of then the blended iron-based powder being packed into, press forming under 500-800MPa, with the ironware that suppresses in 1050-1250 ℃ of following sintering 1-3 hour; protective atmosphere is a hydrogen, makes required iron cover through shaping again.With label is the tinbronze powder of Qsn-6-6-3 another mould of packing into, and press forming under 400-600MP is then in 750-850 ℃ of sintering 1-3 hour; protective atmosphere is a hydrogen, and required copper sheathing is made in shaping again, in order to guarantee the generation of compound tense interfacial pressure; copper sheathing is under interior situation, and the tinbronze powder adopts and closes batch powder, under the copper sheathing situation outside; adopt alloy powder, when complex sintered, during the outer iron of interior copper; the copper layer expands; during the outer copper of interior iron, the copper layer shrinks, thereby bonding surface intensity is increased.Iron cover and copper sheathing were assembled together in 850 ℃ of following sintering 2-3 hours, and protective atmosphere is a hydrogen, makes required part by auxiliary machinery processing then, and the part iron part intensity that processes can reach 400MPa, and junction surface intensity can reach 150MPa.

Embodiment 3: with (weight) 7% bronze medal, 3% lead, 1% tin, 1% carbon, 0.6% sulphur; 87.4% iron powder is put into the powder machine that mixes; add proper amount of machine oil and Zinc Stearate simultaneously; mixed 0.5-2 hour; the mould of then the blended iron-based powder being packed into, press forming under 500-800MPa, with the ironware that suppresses in 1050-1250 ℃ of following sintering 1-3 hour; protective atmosphere is a hydrogen, makes required iron cover through shaping again.With label is the tinbronze powder of Qsn-6-6-3 another mould of packing into, and press forming under 400-600MPa is then in 750-800 ℃ of sintering 1-3 hour; protective atmosphere is a hydrogen, and required copper sheathing is made in shaping again, in order to guarantee the generation of compound tense interfacial pressure; copper sheathing is under interior situation, and the tinbronze powder adopts and closes batch powder, under the copper sheathing situation outside; adopt alloy powder, when complex sintered, during the outer iron of interior copper; the copper layer expands; during the outer copper of interior iron, the copper layer shrinks, thereby bonding surface intensity is increased.Iron cover and steel bushing were assembled together in 800 ℃ of following sintering 2-3 hours, and protective atmosphere is a hydrogen, makes required part by auxiliary machinery processing then, and the part iron part intensity that processes can reach 400MPa, and junction surface intensity can reach 150MPa.

Claims

1; the compound iron-based powder technology of a kind of powdered metallurgy of tin and bronze; it is respectively charged into mould with tinbronze powder and iron-based powder earlier; then by compacting; sintering; shaping; make iron cover and copper sheathing; protective atmosphere during sintering is nitrogen or hydrogen or cracked ammonium; again that iron cover and copper sheathing is compound; make required part by auxiliary machinery processing at last; it is characterized in that iron-based powder composition (weight) is a 2-15% copper; 1-6% lead; 0.5-3% tin; 0.1-3% carbon; 0.2-1.2% sulphur; surplus is iron powder; in iron is enclosed within; copper sheathing is outside the time; the tinbronze powder adopts alloy powder; copper sheathing is interior; when iron overlaps outside; the tinbronze powder adopts and closes batch powder, and after iron cover and copper sheathing were sleeved on together, complex sintered temperature was 750-850 ℃.