High-temperature-resistant nano ceramic particle reinforced cocrystallized Al-Si alloy and casting method thereof

A nano-ceramic particle, eutectic aluminum-silicon technology, applied in the field of metal materials, can solve problems such as unfavorable material property control, uneven thermal expansion and wear resistance, unfavorable overall piston design, etc., to improve thermal stability and performance. The effect of high temperature endurance strength, improving mechanical properties and reducing coefficient of linear expansion

Inactive Publication Date: 2016-08-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of particles to locally strengthen the piston material, the piston material presents inhomogeneity in terms of mechanics, thermal expansion and wear resistance, which is not conducive to the consideration of the overall design of the piston, and is not conducive to the control of material properties in the material preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A high-temperature-resistant nano-ceramic particle reinforced eutectic aluminum-silicon alloy, which is composed of the following components in mass percentage: Si 12.5%, Mg 1.2%, Cu 4.5%, Ni 3.0%, Fe 1.0%, Mn 1.0%, Zr 0.4 %, V 0.4%, TiB 2 25% of particles, the balance is Al. Among them, TiB 2 The particles are nanoparticles with a diameter of 10nm and a hexagonal shape. TiB 2 The particles are uniformly distributed in the aluminum alloy, the interface is clean and there is no interface reaction.

[0028] The preparation method of high-temperature-resistant nano-ceramic particles reinforced eutectic aluminum-silicon alloy adopts the following steps:

[0029] (1) Melting the aluminum ingot and raising the temperature to 850°C;

[0030] (2) KBF 4 、K 2 TiF 6 Mix evenly according to the mass ratio of 1:1.2, add to the melt after drying, perform mechanical stirring, and introduce Ar into the melt at the same time;

[0031] (3) Take out the reaction slag, add Si, Mg ...

Embodiment 2

[0035] A high-temperature-resistant nano-ceramic particle reinforced eutectic aluminum-silicon alloy, which is composed of the following components in mass percentage: Si 12%, Mg 1.0%, Cu 4.2%, Ni 2.3%, Fe 0.6%, Mn 0.6%, Zr 0.3 %, V 0.2%, TiB 2 10% particles, the balance is Al. Among them, TiB 2 The particles are nanoparticles with a particle diameter of 350nm and a rectangular shape. TiB 2 The particles are uniformly distributed in the aluminum alloy, the interface is clean and there is no interface reaction.

[0036] The preparation method of high-temperature-resistant nano-ceramic particles reinforced eutectic aluminum-silicon alloy adopts the following steps:

[0037] (1) Melt the aluminum ingot and raise the temperature to 1050°C;

[0038] (2) KBF 4 、K 2 TiF 6 Mix evenly according to the mass ratio of 1:2.0, add to the melt after drying, perform mechanical stirring, and introduce Ar into the melt at the same time;

[0039] (3) Take out the reaction slag, add Si, ...

Embodiment 3

[0043] A high-temperature-resistant nano-ceramic particle reinforced eutectic aluminum-silicon alloy, which is composed of the following components in mass percentage: Si 11.5%, Mg 0.9%, Cu 4.0%, Ni 2.6%, Fe 0.9%, Mn 0.7%, Zr 0.2 %, V 0.3%, TiB 2 15% particles, the balance is Al. Among them, TiB 2 The particles are nanoparticles with a particle diameter of 10-30nm and a hexagonal shape. TiB 2 The particles are uniformly distributed in the aluminum alloy, the interface is clean and there is no interface reaction.

[0044] The preparation method of high-temperature-resistant nano-ceramic particles reinforced eutectic aluminum-silicon alloy adopts the following steps:

[0045] (1) Melting the aluminum ingot and raising the temperature to 900°C;

[0046] (2) KBF 4 、K 2 TiF 6 Mix evenly according to the mass ratio of 1:1.3, add to the melt after drying, perform mechanical stirring, and introduce Ar into the melt at the same time;

[0047] (3) Take out the reaction slag, ad...

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Abstract

The invention relates to a high-temperature-resistant nano ceramic particle reinforced cocrystallized Al-Si alloy and a casting method thereof. The high-temperature-resistant nano ceramic particle reinforced cocrystallized Al-Si alloy is composed of the following components including, by weight, 9%-13% of Si, 0.2%-3% of Mg, 1%-6% of Cu, 1%-4% of Ni, 0.6%-1.0% of Fe, 0.6%-1.0% of Mn, 0.05%-1.2% of Zr, 0.05%-1.2% of V, 1%-25% of TiB2 particles, and the balance Al. After the high-temperature-resistant nano ceramic particle reinforced cocrystallized Al-Si alloy is subjected to pressure casting, the tensile strength is larger than or equal to 235 MPa at the temperature of 300 DEG C, the tensile strength is larger than or equal to 150 MPa at the temperature of 350 DEG C, and the coefficient of linear expansion within the temperature interval of 300 DEG C to 400 DEG C is (14-21)*10<-6> / DEG C; the casting property of the alloy is improved, the high-temperature (300 DEG C and 350 DEG C) tensile strength of the alloy is improved substantially, the coefficient of linear expansion of the alloy is reduced, and the application range of traditional cocrystallized Al-Si alloys is widened; and the high-temperature-resistant nano ceramic particle reinforced cocrystallized Al-Si alloy is particularly applicable to parts such as pistons of gasoline engines and diesel engines with quite high requirements for high temperature mechanical properties and for dimensional stability in the high-temperature working range.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a high-temperature-resistant nano-ceramic particle-reinforced eutectic aluminum-silicon alloy and a casting method thereof. Background technique [0002] The piston is called the heart of the engine. It bears continuous alternating mechanical loads and thermal loads during the working process of the engine. It is a key part of the engine with the worst working conditions. Since the piston works under the condition of high temperature, high pressure and high speed, the material used for the piston must have high high temperature strength and low thermal expansion coefficient to maintain the stable working efficiency of the engine. The main piston materials currently used are high temperature resistant eutectic aluminum silicon alloy, cast iron and cast steel materials. Among them, the high temperature resistant eutectic aluminum silicon alloy is the most widel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C21/00C22C32/00C22C1/06C22C1/10C22C1/03
CPCC22C21/02C22C1/026C22C1/03C22C1/06C22C1/10C22C21/00C22C32/0073
Inventor 汪明亮陈东吴一王鹏举王浩伟
Owner SHANGHAI JIAO TONG UNIV
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