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Wear-resistant ceramic material, ceramic local reinforced aluminum matrix composite material and preparation method

An aluminum-based composite material and local reinforcement technology, which is used in the preparation of aluminum-based composite materials and in the field of aluminum-based composite materials, can solve the problems of slow heat dissipation, high density of cast iron, and increased vehicle fuel consumption, so as to improve local wear resistance, The effect of prolonging the service life and reducing the cost of raw materials

Active Publication Date: 2017-06-13
NINGBO HIGHRISE NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, cast iron brake hubs and brake discs have the following disadvantages; 1. The density of cast iron is high, with a density of 7.3g / cm 2 Therefore, the weight of the brake hub and brake disc is relatively heavy, and the weight of the brake hub and brake disc belongs to the unsprung weight, which is equivalent to 3~5 times the sprung weight, which will undoubtedly significantly increase the fuel consumption of the vehicle and reduce the Vehicle maneuverability. In addition, it is difficult to disassemble and maintain related components; 2. The thermal conductivity of cast iron is poor, and the heat generated by friction during braking is slow to dissipate, which may easily cause the brake system to fail due to excessive temperature rise.
3. Cast iron brake hubs and brake discs are generally cast with sand castings. The dimensional accuracy and surface finish of the castings are poor, and the internal shrinkage pores are not easy to control. The labor intensity of casting production is high and the environmental pollution is relatively large.

Method used

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  • Wear-resistant ceramic material, ceramic local reinforced aluminum matrix composite material and preparation method
  • Wear-resistant ceramic material, ceramic local reinforced aluminum matrix composite material and preparation method
  • Wear-resistant ceramic material, ceramic local reinforced aluminum matrix composite material and preparation method

Examples

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Effect test

Embodiment 1

[0028] Example 1: Prepare an aluminum alloy brake hub with a wear-resistant layer. The brake hub is made of cast aluminum alloy of the British brand LM24, and its size is Φ480mm (outer diameter) × 227mm (height). Its wear-resistant ceramic material The size of the manufactured wear-resistant layer is Φ420mm (inner diameter)×180mm (height)×7mm (thickness). The preparation method comprises the following steps: by volume fraction, 12% of aluminum silicate short fibers, 8% of silicon carbide particles and 20% of carboxymethyl cellulose aqueous solution with a concentration of 5% and 60% of a concentration of 10% After the silica sol solution is evenly mixed, it is quantitatively poured into the prefabricated part mold and vacuumized to 1×10 -2 Pa, pressurize 20 ~ 30MPa, dewater and press into a ring-shaped prefabricated part, the size of the prefabricated part is Φ420mm (inner diameter) × 180mm (height) × 7mm (thickness); Drying at ℃ for 15 hours, and then sintering at 700-1000℃ ...

Embodiment 2

[0029] Example 2: Prepare an aluminum alloy brake disc with a wear-resistant layer. The brake disc is made of cast aluminum alloy of the American brand A356, and its size is Φ288mm (outer diameter) × 44.3mm (thickness), and its wear-resistant ceramic The size of the wear-resistant layer made of material is Φ288mm (outer diameter)×184mm (inner diameter)×3mm (thickness). The preparation method comprises the following steps: by volume fraction, 8% alumina short fibers, 7% aluminum silicate short fibers, 5% fly ash particles, 5% silicon carbide particles and 25% concentration of 3 % carboxymethyl cellulose aqueous solution and 50% silica sol solution with a concentration of 12% are uniformly mixed, quantitatively poured into the preform mold, and vacuumed to 1×10 -2 Pa, pressurize 20 ~ 30MPa, dewater and press into a ring-shaped prefabricated part, the size of the prefabricated part is Φ288mm (outer diameter) × 184mm (inner diameter) × 3mm (thickness); Drying at 200°C for 10 hour...

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Abstract

The composition of the wear-resistant ceramic material disclosed in the present invention includes a ceramic skeleton material and a ceramic particle material with a volume ratio of (5-30): (1-25). The wear-resistant ceramic material has good wear resistance and is suitable for improving wear resistance. For occasions with high requirements, it can be partially compounded on the surface of the aluminum alloy matrix to improve the wear resistance of the aluminum alloy matrix; the ceramic locally reinforced aluminum matrix composite material disclosed in the present invention and its preparation method with strong operability can be applied on the surface of the aluminum alloy matrix The wear-resistant layer made of local composite wear-resistant ceramic materials can improve the local wear resistance of aluminum alloy, and at the same time make full use of the characteristics of low density and good thermal conductivity of aluminum alloy, so that the composite material can be applied to various wear-resistant It is especially suitable for the occasions with high heat dissipation requirements and lightweight requirements, especially for brake systems such as brake hubs and brake discs, which can effectively prolong the service life of the brake system, reduce fuel consumption, improve the passing performance of the vehicle and Shorten the braking distance and improve the safety of the car.

Description

technical field [0001] The invention relates to the technical field of ceramics and ceramic composite materials, in particular to a wear-resistant ceramic material, an aluminum-based composite material locally reinforced by the wear-resistant ceramic material, and a preparation method of the aluminum-based composite material. Background technique [0002] The wear-resistant ceramic material has excellent wear resistance, and the metal matrix composite material formed after it is combined with a metal material can make full use of its wear resistance and have a better local wear resistance effect. Brake hubs and brake discs are the key safety parts of automobiles, which act as friction brakes and require good wear resistance and comprehensive mechanical properties. In the process of driving, it is very important whether the brake hub or brake disc can brake safely and reliably. If the brake fails in an emergency, it will cause a safety accident, or even cause a car crash. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/622C22C49/14C22C47/12C22C101/04
Inventor 齐霖齐丕骧
Owner NINGBO HIGHRISE NEW MATERIAL CO LTD
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