A friction pair of al/sic and cu/sic composite materials for rail vehicles and its preparation method

A technology for rail vehicles and composite materials, applied in the field of Al/Sic and Cu/Sic composite friction pairs and their preparation, can solve the problems of poor thermal fatigue resistance, complex production process, high quality of friction pairs, etc. Frictional properties, reduced traction power consumption, short production cycle effects

Active Publication Date: 2018-04-17
浙江天乐新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a simple production process, short production cycle, friction pair, etc. Strong heat dissipation friction pair for rail vehicles with small secondary mass, good thermal conductivity and long service life and preparation method thereof

Method used

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  • A friction pair of al/sic and cu/sic composite materials for rail vehicles and its preparation method
  • A friction pair of al/sic and cu/sic composite materials for rail vehicles and its preparation method
  • A friction pair of al/sic and cu/sic composite materials for rail vehicles and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The friction pair of ZL111 aluminum-based split shaft-mounted brake disc / aluminum bronze brake pad is reinforced by network silicon carbide ceramic skeleton

[0050] Step 1: Preparation of the network silicon carbide ceramic skeleton: the silicon carbide slurry prepared according to a certain ratio is prepared into a silicon carbide ceramic green body by the precursor impregnation method and dried. Using the pressureless sintering method, put the silicon carbide ceramic green body into the sintering furnace at a temperature of 1950-2200°C and keep it warm for 0.5-3 hours to obtain a network silicon carbide ceramic with a length of 400mm, a width of 400mm and a thickness of 7-15mm block, the photo of the network SiC ceramic block is attached figure 2 . Cut it into the required shape of the network silicon carbide ceramic skeleton as the reinforcement of the brake disc and brake pad see the attached image 3 . The porosity of the network silicon carbide ceramics is 40...

Embodiment 2

[0062] 7075 aluminum-based wheel-mounted brake disc / brass brake disc friction pair reinforced by network silicon carbide ceramic skeleton

[0063] Step 1: Preparation of the network silicon carbide ceramic skeleton: the slurry prepared according to a certain ratio is prepared into a ceramic green body by gel-injection molding method and dried. Using the pressureless sintering method, the sintering temperature is 2200°C, and the temperature is kept for 3 hours to obtain a network silicon carbide ceramic block with a length of 300mm, a width of 300mm, and a thickness of 15mm, which is cut into the required reinforcement shape by laser. The porosity of the network silicon carbide ceramics is 90%, the mesh diameter is 8mm, the mass percentage of silicon carbide in the network silicon carbide ceramics is 90%, and the density of the ceramic skeleton is 2.6g / cm 3 , Vickers hardness (HVS) 18GPa, flexural strength 10MPa, compressive strength 15MPa, thermal conductivity 130W / mK.

[006...

Embodiment 3

[0073] Network silicon carbide ceramic skeleton reinforced 2618 aluminum-based overall shaft-mounted brake disc / friction pair of tin bronze brake pads

[0074] Step 1: Preparation of the network silicon carbide ceramic skeleton: the slurry prepared according to a certain ratio is prepared into a ceramic green body by three-dimensional printing forming method, and the shape is trimmed. Using the pressureless sintering method, the sintering temperature is 2200°C, and the heat preservation is 3 hours. The sintering network silicon carbide ceramic block with a length of 150mm, a width of 150mm, and a thickness of 20mm is laser cut into the required reinforcement shape. The porosity of the network silicon carbide ceramics is about 70-90%, the mesh diameter is 2-5mm, the mass percentage of silicon carbide in the network silicon carbide ceramics is 97%, and the density of the ceramic skeleton is ~2.9g / cm 3 , Vickers hardness (HVS) ~ 20GPa, flexural strength ~ 15MPa, compressive stren...

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Abstract

The invention discloses an Al / Sic and Cu / Sic composite material friction pair for rail vehicles and a preparation method thereof, belonging to the technical field of friction pair manufacturing. The prior art has the defects of complex production process, poor heat conduction and short service life. The friction surface of the present invention is embedded with a network silicon carbide ceramic skeleton, and the other side is provided with a number of cooling ribs in the circumferential direction. The silicon carbide ceramic skeleton has a grid-shaped heat sink on the other side; the manufacturing steps of the present invention are: preparation of the network silicon carbide ceramic skeleton → skeleton pretreatment → design and manufacture of brake discs and brake pad casting molds → brake discs, brake pads Low-pressure casting of brake pads → heat treatment of brake discs and brake pads → precision machining of brake discs and brake pads → storage of finished products. The invention has the advantages of simple manufacturing process, light weight, high and stable friction coefficient, good thermal conductivity and long service life, and is suitable for existing rail vehicles.

Description

technical field [0001] The invention belongs to the technical field of friction pair manufacturing, and in particular relates to an Al / Sic and Cu / Sic composite material friction pair for rail vehicles and a preparation method thereof. Background technique [0002] Lightweight is one of the key technologies of high-speed trains. With the rapid development of my country's high-speed railway, the train speed may exceed 380km / h, so more stringent requirements are put forward for the performance of brake discs and brake pads. Ceramic-reinforced metal-matrix composite materials, especially network-structured silicon carbide ceramic-reinforced aluminum-based and copper-based composite materials, are used in the friction pairs of high-speed trains, which can significantly reduce the unsprung weight and achieve lightweight. Silicon carbide ceramics have excellent properties such as high modulus, high wear resistance, high strength and low density. Metal materials have good toughness...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D69/02F16D69/04
Inventor 房明喻亮房殊
Owner 浙江天乐新材料科技有限公司
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