CN103774005A - Preparation method for high-performance aluminum-based composite material - Google Patents

Abstract

The invention provides a preparation method for a high-performance aluminum-based composite material. The method has the advantages of easiness, low production cost and applicability to industrial production. The composite material is prepared from the following components: 75% of Al, 5% of Mg, 2% of Sn, 3% of Si, 1% of Cr and 0.03% of Nd, with the balance being Zn. The preparation method comprises the following steps: preparing the above-mentioned components; putting a half of an Al ingot in the components onto the bottom of a crucible, then successively adding a pure Si block, pure Cr powder, a pure Mg ingot, a pure Sn strip, a pure Nd block and a pure Zn ingot, adding the rest of the Al ingot and carrying out heating for fusing; allowing heating temperature to rise to 700 DEG C, then adding a composite treatment agent accounting for 0.5 to 2% of the total mass of the components and maintaining the temperature of 720 DEG C for 10 min; and preheating an ingot mold to 150 DEG C, then pouring an alloy solution obtained in the previous step into the ingot mold and carrying out cooling to room temperature so as to obtain the aluminum-based composite material.

Description

A kind of preparation method of high-performance aluminum-base composite material

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technical field:

The present invention relates to a kind of preparation method of high performance aluminum matrix composite, belong to materials processing technology field.

 

background technology:

At present, the hardness of aluminium alloy and wear resisting property can meet the requirement to sliding surface bearing such as all kinds of oil engines, compressor, mechanical drive substantially, but because bearing is in work, the frictional force producing when axle pressure and radial rotating is larger, the period of a permutation of aluminium alloy is too short, therefore, need to work out one and have compared with highly anti-fatigue intensity, and well behaved bearing materials is the research direction that bearing is carried out at end.

 

summary of the invention:

The invention provides a kind of preparation method of aluminum-based bearing compound material, the method technique is simple, and production cost is low, functional, is suitable for suitability for industrialized production.

the object of the invention is to realize by following measures:

A preparation method for aluminum-based bearing compound material, this matrix material is prepared from by following composition:

1) by quality percentage composition be: Al 75%, Mg 5%, Sn 2%, Si 3%, Cr 1%, Nd 0.03%, all the other prepare burden for Zn; Each composition adopts pure Al ingot, pure Mg ingot, pure Si piece, pure Sn bar, pure Cr powder, pure Nd piece, pure Zn ingot;

2) first put into the half of above-mentioned batching Al ingot in crucible bottom, then put into again successively pure Si piece, pure Cr powder, pure Mg ingot, pure Sn bar, pure Nd piece, pure Zn ingot, then remaining Al ingot is put into heat fused;

3) when Heating temperature rises to 700 ℃, add the composite treating agent that accounts for step 1) raw material total mass 0.5-2%, in the time of 720 ℃, be incubated 10 minutes; Wherein the composition of composite treating agent and mass ratio thereof are: Potassium monofluoride: sodium-chlor: bariumchloride: Cerium II Chloride: zinc chloride=1:2:0.3:0.4:0.6);

4) first ingot mold is preheated to 150 ℃, then the alloy solution of step 3) is poured in ingot mold, is cooled to room temperature, obtain aluminum-based bearing compound material.

compared with prior art, the present invention has following beneficial effect:

1, Mg, the Zn dosing in aluminum-based bearing compound material of the present invention, Si has solution strengthening effect to Al, can improve the fatigue resistance of material;

2, the Sn outside solid solubility and Si, Cr and Mg pass through chemical combination and original position formation AlMgSiSnCr bulk Compound Phase.Nd can make AlMgSiSnCr bulk compound phase-variable tiny;

3, Mg, Zn, Sn, the Cr metal in while matrix material, dosed can improve the lipophilicity of material to lubricating oil.

4, the composite treating agent that the present invention adopts has poly-slag, isolated air contact, prevents the effect of burning.

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embodiment:

umber in following embodiment is weight part.

embodiment mono-:

the preparation of aluminum-based bearing compound material of the present invention:

The preparation method of aluminum-based bearing compound material of the present invention, this matrix material is prepared from by following composition:

1) by quality percentage composition be: Al 75%, Mg 5%, Sn 2%, Si 3%, Cr 1%, Nd 0.03%, all the other prepare burden for Zn; Each composition adopts pure Al ingot, pure Mg ingot, pure Si piece, pure Sn bar, pure Cr powder, pure Nd piece, pure Zn ingot;

2) first put into the half of above-mentioned batching Al ingot in crucible bottom, then put into again successively pure Si piece, pure Cr powder, pure Mg ingot, pure Sn bar, pure Nd piece, pure Zn ingot, then remaining Al ingot is put into heat fused;

3) when Heating temperature rises to 700 ℃, add the composite treating agent that accounts for step 1) raw material total mass 0.5-2%, in the time of 720 ℃, be incubated 10 minutes; Wherein the composition of composite treating agent and mass ratio thereof are: Potassium monofluoride: sodium-chlor: bariumchloride: Cerium II Chloride: zinc chloride=1:2:0.3:0.4:0.6.

4) first ingot mold is preheated to 150 ℃, then the alloy solution of step 3) is poured in ingot mold, is cooled to room temperature, obtain aluminum-based bearing compound material.

experimental data:

Following table is the index parameter of aluminum-based bearing compound material of the present invention:

Composition	Hardness (HB)	Tensile strength (N/mm 2）	Elongation/%
				The product obtaining as embodiment tetra-	124	279	12

Claims (1)

1. a preparation method for aluminum-based bearing compound material, this matrix material is prepared from by following composition:

1) by quality percentage composition be: Al 75%, Mg 5%, Sn 2%, Si 3%, Cr 1%, Nd 0.03%, all the other prepare burden for Zn; Each composition adopts pure Al ingot, pure Mg ingot, pure Si piece, pure Sn bar, pure Cr powder, pure Nd piece, pure Zn ingot;

2) first put into the half of above-mentioned batching Al ingot in crucible bottom, then put into again successively pure Si piece, pure Cr powder, pure Mg ingot, pure Sn bar, pure Nd piece, pure Zn ingot, then remaining Al ingot is put into heat fused;

3) when Heating temperature rises to 700 ℃, add the composite treating agent that accounts for step 1) raw material total mass 0.5-2%, in the time of 720 ℃, be incubated 10 minutes; Wherein the composition of composite treating agent and mass ratio thereof are: Potassium monofluoride: sodium-chlor: bariumchloride: Cerium II Chloride: zinc chloride=1:2:0.3:0.4:0.6;

4) first ingot mold is preheated to 150 ℃, then the alloy solution of step 3) is poured in ingot mold, is cooled to room temperature, obtain aluminum-based bearing compound material.