CN106191537A - A kind of high heat-and corrosion-resistant car exhaust valve aluminum matrix composite - Google Patents

Abstract

The invention discloses a kind of high heat-and corrosion-resistant car exhaust valve aluminum matrix composite, be made up of the raw material of following weight portion: aluminum 95 98, stannum 0.1 0.2, selenium 0.04 0.06, germanium 0.06 0.08, nickel 0.1 0.2, copper 1 1.3, zinc 1.8 2.4, titanium 0.11 0.13, cetyl trimethylammonium bromide 0.06 0.1, bismuth 0.2 0.25, graphene oxide 35, zircoium hydride 58, hexachlorethane 0.9 1.2, xanthan gum 0.25 0.3, hausmannite stone 1.2 1.6, brium carbonate 23, sodium sulfide 0.6 0.8, impurity≤0.01, deionized water are appropriate；The aluminum alloy materials of the present invention has advantage heat-resisting, corrosion-resistant, that anti-wear performance is good, has durable in use, the advantage of life-span in life-span length for car exhaust valve, cost-effective, is worthy to be popularized.

Description

A kind of high heat-and corrosion-resistant car exhaust valve aluminum matrix composite

Technical field

The present invention relates to technical field of automobile parts, particularly relate to a kind of high heat-and corrosion-resistant car exhaust valve aluminum base Composite.

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 High-temperature behavior, has therefore suffered from paying close attention to widely.Conventional particle enhanced aluminum-based composite material technology of preparing has powder metallurgic method With 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, permissible Producing the composite of large volume, 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 because of it Reinforcement.But Graphene is very easy to reunite in metallic matrix, has become as restriction Graphene and strengthen Metal Substrate again The key factor of condensation material development.Gao Xin is in " preparation of Graphene reinforced aluminum matrix composites and mechanical property research " literary composition Use the Hummers preparation graphene oxide containing a large amount of negative charges, then use cationic surfactant to process aluminium powder and make Its surface is with positive charge, and utilizes the mode of electrostatic self-assembled by the absorption of graphene uniform on aluminium powder surface, finally with The mode of hot pressed sintering prepares aluminum matrix composite, but the addition of the consumption of surfactant, Graphene all can affect burning Knot performance, relatively big on impacts such as the hardness of material, tensile strength, mechanical properties, 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 a kind of high heat-and corrosion-resistant car exhaust valve is used Aluminum matrix composite.

The present invention is achieved by the following technical solutions:

A kind of high heat-and corrosion-resistant car exhaust valve aluminum matrix composite, is made up of the raw material of following weight portion: aluminum 95- 98, stannum 0.1-0.2, selenium 0.04-0.06, germanium 0.06-0.08, nickel 0.1-0.2, copper 1-1.3, zinc 1.8-2.4, titanium 0.11-0.13, Cetyl trimethylammonium bromide 0.06-0.1, bismuth 0.2-0.25, graphene oxide 3-5, zircoium hydride 5-8, hexachlorethane 0.9- 1.2, xanthan gum 0.25-0.3, hausmannite stone 1.2-1.6, brium carbonate 2-3, sodium sulfide 0.6-0.8, impurity≤0.01, deionization Water is appropriate.

Described one high heat-and corrosion-resistant car exhaust valve aluminum matrix composite, is made up of following concrete steps:

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

(2) xanthan gum is added in the deionized water of 3 times amount, be heated to while stirring being completely dissolved rear and hexachlorethane, black manganese The mixing of Ore, sodium sulfide is added in high speed mixer, sends in comminutor and extrude after stirring 10min with the speed of 1000 revs/min Pelletize, sends into granule in sintering furnace with 10 DEG C/min of ramp to 450 DEG C, sinters 2 hours, takes out and is cooled to room temperature pressure Make block standby；

(3) residue aluminium powder, stannum, selenium, germanium, nickel, copper, zinc, titanium, bismuth mixing are added to ball milling in planetary ball mill, use argon conduct Protective atmosphere, crosses 400 mesh sieves, is then added in smelting furnace be heated to be semisolid, stir semi solid aluminum Base Metal after ball milling 4-5h Limit adds brium carbonate, 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, refining agent bell jar prepared by step (2) In press-in aluminium alloy, and it is in rotary moving to make even level, and refining time is 10-12min, stands 10-15min, then add after skimming Enter 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, by step (4) The foaming aluminium alloy obtained is poured in mould, and 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 and Electronegative graphene oxide supersound process so that it is adsorb on aluminium powder surface uniformly, agglomeration does not occur, it is achieved graphite Alkene is dispersed in aluminum alloy melt, and enhances the intensity of aluminum matrix composite, hardness, tensile strength and mechanical property etc., The double deoxidizer added reacts with aluminum alloy melt, has good deoxidation, desulfurization, the effect of carburetting, and adds after refine Adding foaming agent, melt foaming processes and makes material and parent metal reaction fully, and the compatibility is good, and preparation cost is low, technique letter Single；The aluminum alloy materials of the present invention has advantage heat-resisting, corrosion-resistant, that anti-wear performance is good, has prolonged for car exhaust valve Durable, the advantage of life-span in life-span length, cost-effective, it is worthy to be popularized.

Detailed description of the invention

A kind of high heat-and corrosion-resistant car exhaust valve aluminum matrix composite, is prepared by the raw material of following weight portion (kilogram) Make: aluminum 95, stannum 0.1, selenium 0.04, germanium 0.06, nickel 0.1, copper 1, zinc 1.8, titanium 0.11, cetyl trimethylammonium bromide 0.06, bismuth 0.2, graphene oxide 3, zircoium hydride 5, hexachlorethane 0.9, xanthan gum 0.25, hausmannite stone 1.2, brium carbonate 2, sulfur Change sodium 0.6, impurity≤0.01, deionized water appropriate.

Described one high heat-and corrosion-resistant car exhaust valve aluminum matrix composite, is made up of following concrete steps:

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

(2) xanthan gum is added in the deionized water of 3 times amount, be heated to while stirring being completely dissolved rear and hexachlorethane, black manganese The mixing of Ore, sodium sulfide is added in high speed mixer, sends in comminutor and extrude after stirring 10min with the speed of 1000 revs/min Pelletize, sends into granule in sintering furnace with 10 DEG C/min of ramp to 450 DEG C, sinters 2 hours, takes out and is cooled to room temperature pressure Make block standby；

(3) residue aluminium powder, stannum, selenium, germanium, nickel, copper, zinc, titanium, bismuth mixing are added to ball milling in planetary ball mill, use argon conduct Protective atmosphere, crosses 400 mesh sieves, is then added in smelting furnace be heated to be semisolid, stir semi solid aluminum Base Metal limit after ball milling 4h Adding brium carbonate, 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, refining agent bell jar prepared by step (2) is pressed into In aluminium alloy, and it is in rotary moving to make even level, and refining time is 10min, stands 10min, add foaming agent hydrogen after skimming Change zirconium 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, step (4) is obtained Foaming aluminium alloy be 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: 228MPa；Tensile strength: 238MPa；Have no progeny percentage of total elongation: 20.8%；Impact strength: 42J.

Claims (2)

1. one kind high heat-and corrosion-resistant car exhaust valve aluminum matrix composite, it is characterised in that by the raw material of following weight portion Preparation is made: aluminum 95-98, stannum 0.1-0.2, selenium 0.04-0.06, germanium 0.06-0.08, nickel 0.1-0.2, copper 1-1.3, zinc 1.8- 2.4, titanium 0.11-0.13, cetyl trimethylammonium bromide 0.06-0.1, bismuth 0.2-0.25, graphene oxide 3-5, zircoium hydride 5-8, hexachlorethane 0.9-1.2, xanthan gum 0.25-0.3, hausmannite stone 1.2-1.6, brium carbonate 2-3, sodium sulfide 0.6-0.8, miscellaneous Matter≤0.01, deionized water are appropriate.

A kind of high heat-and corrosion-resistant car exhaust valve aluminum matrix composite, it is characterised in that by Following concrete steps are made:

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

(2) xanthan gum is added in the deionized water of 3 times amount, be heated to while stirring being completely dissolved rear and hexachlorethane, black manganese The mixing of Ore, sodium sulfide is added in high speed mixer, sends in comminutor and extrude after stirring 10min with the speed of 1000 revs/min Pelletize, sends into granule in sintering furnace with 10 DEG C/min of ramp to 450 DEG C, sinters 2 hours, takes out and is cooled to room temperature pressure Make block standby；

(3) residue aluminium powder, stannum, selenium, germanium, nickel, copper, zinc, titanium, bismuth mixing are added to ball milling in planetary ball mill, use argon conduct Protective atmosphere, crosses 400 mesh sieves, is then added in smelting furnace be heated to be semisolid, stir semi solid aluminum Base Metal after ball milling 4-5h Limit adds brium carbonate, 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, refining agent bell jar prepared by step (2) In press-in aluminium alloy, and it is in rotary moving to make even level, and refining time is 10-12min, stands 10-15min, then add after skimming Enter 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, by step (4) The foaming aluminium alloy obtained is poured in mould, and pouring temperature is 650-680 DEG C, then naturally cools to room temperature the most available.