CN105950919A - Automobile composite with high fatigue strength - Google Patents

Abstract

The invention discloses an automobile composite with high fatigue strength. The automobile composite is prepared by raw materials including, by weight, 95-98 parts of aluminum, 0.03-0.04 part of tungsten, 0.1-0.13 part of chromium, 0.5-0.6 part of manganese, 0.4-0.5 part of silicon, 0.2-0.3 part of molybdenum, 0.05-0.07 part of zirconium, 0.06-0.1 part of hexadecyl trimethyl ammonium bromide, 3-5 parts of graphene oxide, 5-8 parts of zirconium hydride, 0.77-1 part of hexachloroethane, 0.3-0.4 part of high-manganese slag, 0.1-0.2 part of polytetrafluoroethylene, 0.4-0.6 part of calcium oxide, 0.22-0.25 part of carboxymethyl cellulose, 1.2-1.5 parts of boron nitride, less than or equal to 0.01 part of impurities, and an appropriate amount of deionized water. The obtained aluminum alloy material has the high tensile strength and high yield limit, also has excellent fatigue strength and high-temperature thermal stability and has the advantages of high safety, long service life and cost saving when used for manufacturing automobile parts.

Description

The composite material for cars that a kind of fatigue strength is high

Technical field

The present invention relates to technical field of automobile parts, particularly relate to the composite material for cars that a kind of fatigue strength is high.

Background technology

Aluminum matrix composite has high specific strength, specific stiffness, ratio elastic modelling quantity, the most also has the most wear-resisting, resistance to elevated temperatures, has therefore suffered from paying close attention to widely.Conventional particle enhanced aluminum-based composite material technology of preparing has powder metallurgic method and two kinds of techniques of casting.But the complex process equipment of powder metallurgic method, high expensive, be difficult to prepare large volume and complex-shaped part.And there is the danger such as dust-firing and blast in process of production.Casting technique is simple, easy to operate, can produce the composite of large volume, and equipment investment is few, and production cost is low, suitable for mass production.

Graphene has the most excellent physical property and mechanical performance it is considered to be optimal metal_based material reinforcement because of it.But Graphene is very easy to reunite in metallic matrix, has become as the key factor of restriction graphene reinforced metal-matrix composite development.Gao Xin uses the Hummers preparation graphene oxide containing a large amount of negative charges in " preparation of Graphene reinforced aluminum matrix composites and mechanical property research " literary composition, then using cationic surfactant to process aluminium powder makes its surface with positive charge, and utilize the mode of electrostatic self-assembled by the absorption of graphene uniform on aluminium powder surface, finally in the way of hot pressed sintering, prepare aluminum matrix composite, but the consumption of surfactant, the addition of Graphene all can affect sintering character, hardness to material, tensile strength, the impact such as mechanical property is bigger, quality of materials poor stability.

Summary of the invention

The object of the invention is contemplated to make up the defect of prior art, it is provided that the composite material for cars that a kind of fatigue strength is high.

The present invention is achieved by the following technical solutions:

The composite material for cars that a kind of fatigue strength is high, is made up of the raw material of following weight portion: aluminum 95-98, tungsten 0.03-0.04, chromium 0.1-0.13, manganese 0.5-0.6, silicon 0.4-0.5, molybdenum 0.2-0.3, zirconium 0.05-0.07, cetyl trimethylammonium bromide 0.06-0.1, graphene oxide 3-5, zircoium hydride 5-8, hexachlorethane 0.77-1, high manganese slag 0.3-0.4, politef 0.1-0.2, calcium oxide 0.4-0.6, carboxymethyl cellulose 0.22-0.25, boron nitride 1.2-1.5, impurity≤0.01, deionized water are appropriate.

The composite material for cars that described a kind of fatigue strength is high, is made up of following concrete steps:

(1) by the cetyl trimethylammonium bromide deionized water dissolving of 6-8 times amount, it is subsequently adding the aluminium powder ultrasonic disperse 20-30min of total amount 10%, the most at room temperature magnetic agitation 1h, filters, wash, the most standby；Graphene oxide being added to ultrasonic disperse 1h again in 50ml deionized water, aluminium powder is added in the deionized water of 100ml stirring and forms aluminum paste, be added to graphene oxide water solution in aluminum paste be stirred continuously, until color becomes colorless transparent, filtration drying is standby；

(2) carboxymethyl cellulose is added in the deionized water of 3 times amount; mix with hexachlorethane, high manganese slag, politef, calcium oxide after being heated to while stirring being completely dissolved and be added in high speed mixer; extruding pelletization in comminutor is sent into after stirring 10min with the speed of 1000 revs/min; granule is sent in sintering furnace with 10 DEG C/min of ramp to 450 DEG C; sintering 2 hours, it is standby that taking-up is cooled to room temperature briquet；

(3) residue aluminium powder, tungsten, chromium, manganese, silicon, molybdenum, zirconium mixing are added to ball milling in planetary ball mill; with argon as protective atmosphere; 400 mesh sieves are crossed after ball milling 4-5h; it is then added in smelting furnace be heated to be semisolid; stirring semi solid aluminum Base Metal limit adds boron nitride, and heating up, it is standby that solid-state mixed slurry is heated to liquid mixed slurry；

(4) the liquid slurry of step (3) is heated to 740-760 DEG C and carries out refine; in refining agent bell jar press-in aluminium alloy prepared by step (2); and it is in rotary moving to make even level; refining time is 10-12min; 10-15min is stood after skimming; add foaming agent zircoium hydride to stir, pour foaming groove after mix homogeneously into and foam under 620-700 DEG C of argon shield 0.5-2h；

(5) mould is preheated to 220-300 DEG C standby, then mixture prepared by step (1) is placed in mould, the foaming aluminium alloy that step (4) obtains is poured in mould, pouring temperature is 650-680 DEG C, then naturally cools to room temperature the most available.

The invention have the advantage that the present invention uses surfactant to process part aluminium powder and makes its lotus that becomes positively charged, then with electronegative graphene oxide supersound process, it is made to adsorb on aluminium powder surface uniformly, there is not agglomeration, realize Graphene dispersed in aluminum alloy melt, and enhance the intensity of aluminum matrix composite, hardness, tensile strength and mechanical property etc., the double deoxidizer added reacts with aluminum alloy melt, there is good deoxidation, desulfurization, the effect of carburetting, and after refine, add foaming agent, melt foaming processes and makes material and parent metal reaction fully, the compatibility is good, and preparation cost is low, technique is simple；Gained aluminum alloy materials of the present invention not only has high tensile strength, a yield limit, but also has excellent fatigue resistance, high high-temp stability, for auto parts and components safety height, length in service life, cost-effective advantage.

Detailed description of the invention

The composite material for cars that a kind of fatigue strength is high, is made up of the raw material of following weight portion (kilogram): aluminum 95, tungsten 0.03, chromium 0.1, manganese 0.5, silicon 0.4, molybdenum 0.2, zirconium 0.05, cetyl trimethylammonium bromide 0.06, graphene oxide 3, zircoium hydride 5, hexachlorethane 0.77, high manganese slag 0.3, politef 0.1, calcium oxide 0.4, carboxymethyl cellulose 0.22, boron nitride 1.2, impurity≤0.01, deionized water are appropriate.

The composite material for cars that described a kind of fatigue strength is high, is made up of following concrete steps:

(1) by the cetyl trimethylammonium bromide deionized water dissolving of 6 times amount, it is subsequently adding the aluminium powder ultrasonic disperse 20min of total amount 10%, the most at room temperature magnetic agitation 1h, filters, wash, the most standby；Graphene oxide being added to ultrasonic disperse 1h again in 50ml deionized water, aluminium powder is added in the deionized water of 100ml stirring and forms aluminum paste, be added to graphene oxide water solution in aluminum paste be stirred continuously, until color becomes colorless transparent, filtration drying is standby；

(2) carboxymethyl cellulose is added in the deionized water of 3 times amount; mix with hexachlorethane, high manganese slag, politef, calcium oxide after being heated to while stirring being completely dissolved and be added in high speed mixer; extruding pelletization in comminutor is sent into after stirring 10min with the speed of 1000 revs/min; granule is sent in sintering furnace with 10 DEG C/min of ramp to 450 DEG C; sintering 2 hours, it is standby that taking-up is cooled to room temperature briquet；

(3) residue aluminium powder, tungsten, chromium, manganese, silicon, molybdenum, zirconium mixing are added to ball milling in planetary ball mill; with argon as protective atmosphere; 400 mesh sieves are crossed after ball milling 4h; it is then added in smelting furnace be heated to be semisolid; stirring semi solid aluminum Base Metal limit adds boron nitride, and heating up, it is standby that solid-state mixed slurry is heated to liquid mixed slurry；

(4) the liquid slurry of step (3) is heated to 740 DEG C and carries out refine; in refining agent bell jar press-in aluminium alloy prepared by step (2); and it is in rotary moving to make even level; refining time is 10min; 10min is stood after skimming; add foaming agent zircoium hydride to stir, pour foaming groove after mix homogeneously into and foam under 620 DEG C of argon shields 0.5h；

(5) mould is preheated to 220 DEG C standby, then mixture prepared by step (1) is placed in mould, the foaming aluminium alloy that step (4) obtains is poured in mould, pouring temperature is 650 DEG C, then naturally cools to room temperature the most available.

The aluminum matrix composite preparing embodiment carries out performance test, and result is as follows:

Yield strength: 242.3MPa；Tensile strength: 261.5MPa；Have no progeny percentage of total elongation: 22.4%；Impact strength: 43J.

Claims (2)

1. the composite material for cars that a fatigue strength is high, it is characterized in that, be made up of the raw material of following weight portion: aluminum 95-98, tungsten 0.03-0.04, chromium 0.1-0.13, manganese 0.5-0.6, silicon 0.4-0.5, molybdenum 0.2-0.3, zirconium 0.05-0.07, cetyl trimethylammonium bromide 0.06-0.1, graphene oxide 3-5, zircoium hydride 5-8, hexachlorethane 0.77-1, high manganese slag 0.3-0.4, politef 0.1-0.2, calcium oxide 0.4-0.6, carboxymethyl cellulose 0.22-0.25, boron nitride 1.2-1.5, impurity≤0.01, deionized water are appropriate.

The composite material for cars that a kind of fatigue strength is high, it is characterised in that be made up of following concrete steps:

(1) by the cetyl trimethylammonium bromide deionized water dissolving of 6-8 times amount, it is subsequently adding the aluminium powder ultrasonic disperse 20-30min of total amount 10%, the most at room temperature magnetic agitation 1h, filters, wash, the most standby；Graphene oxide being added to ultrasonic disperse 1h again in 50ml deionized water, aluminium powder is added in the deionized water of 100ml stirring and forms aluminum paste, be added to graphene oxide water solution in aluminum paste be stirred continuously, until color becomes colorless transparent, filtration drying is standby；

(2) carboxymethyl cellulose is added in the deionized water of 3 times amount; mix with hexachlorethane, high manganese slag, politef, calcium oxide after being heated to while stirring being completely dissolved and be added in high speed mixer; extruding pelletization in comminutor is sent into after stirring 10min with the speed of 1000 revs/min; granule is sent in sintering furnace with 10 DEG C/min of ramp to 450 DEG C; sintering 2 hours, it is standby that taking-up is cooled to room temperature briquet；

(3) residue aluminium powder, tungsten, chromium, manganese, silicon, molybdenum, zirconium mixing are added to ball milling in planetary ball mill; with argon as protective atmosphere; 400 mesh sieves are crossed after ball milling 4-5h; it is then added in smelting furnace be heated to be semisolid; stirring semi solid aluminum Base Metal limit adds boron nitride, and heating up, it is standby that solid-state mixed slurry is heated to liquid mixed slurry；

(4) the liquid slurry of step (3) is heated to 740-760 DEG C and carries out refine; in refining agent bell jar press-in aluminium alloy prepared by step (2); and it is in rotary moving to make even level; refining time is 10-12min; 10-15min is stood after skimming; add foaming agent zircoium hydride to stir, pour foaming groove after mix homogeneously into and foam under 620-700 DEG C of argon shield 0.5-2h；

(5) mould is preheated to 220-300 DEG C standby, then mixture prepared by step (1) is placed in mould, the foaming aluminium alloy that step (4) obtains is poured in mould, pouring temperature is 650-680 DEG C, then naturally cools to room temperature the most available.