A preparation method of porous network ceramic reinforced steel-based composite brake block

A technology of brake block and mesh, which is applied in the field of preparation of porous mesh ceramic reinforced steel-based composite brake block, can solve the problems of low mechanical strength, large amount of wear, and low service life, and achieve good wettability, high resistance Oxidative effect

Active Publication Date: 2020-03-17
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing brake blocks are mainly made of integral cast iron materials or composite materials, which have disadvantages such as poor heat resistance, large amount of wear during service, low mechanical strength, and short service life.

Method used

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  • A preparation method of porous network ceramic reinforced steel-based composite brake block

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preparation example Construction

[0029] A method for preparing a porous network ceramic reinforced steel-based composite brake block of the present invention comprises the following steps:

[0030] S1, the TiB 2 Add powder and additives to deionized water and stir well to obtain ceramic slurry suspension;

[0031] Additives include stainless steel powder, ammonium citrate, carboxymethyl cellulose, and silica sol.

[0032] TiB 2 Powder accounts for 60-80% of the total mass of ceramic slurry, additives account for 10-30% of the total mass of ceramic slurry, deionized water accounts for 10-25%; stainless steel powder accounts for 60-80% of additive mass, ammonium citrate accounts for 5-8% of the mass of the additive, carboxymethyl cellulose accounts for 4-6% of the mass of the additive, and silica sol accounts for 10-30% of the mass of the additive.

[0033] S2. Select an organic foam with a suitable pore size, dip it in the ceramic slurry, take it out after 1-5 minutes and squeeze out the excess slurry;

[...

Embodiment 1

[0041] 1) First, 99.4g TiB 2 Powder, 42.6g of stainless steel powder, 1.42g of ammonium citrate and 0.71g of carboxymethyl cellulose were added to 32mL of deionized water and 8mL of silica sol were added, and stirred well to obtain a ceramic slurry suspension;

[0042] 2) Secondly, select 5PPI soft polyurethane foam, dip it in the ceramic slurry, take it out after 1min and squeeze out the excess slurry;

[0043] 3) After drying the impregnated organic foam, raise the temperature from room temperature to 600°C at a rate of 1°C / min in a vacuum furnace and keep it warm for 55 minutes, then raise the temperature to 1200°C at a rate of 10°C / min, and then Sinter at 1550°C for 1 hour at a heating rate of 5°C / min, and cool down with the furnace to obtain a porous mesh preform;

[0044] 4) Fix the prefabricated body on the end surface or the working surface of the casting mold, pour the metal liquid of the steel matrix material by casting infiltration process, and obtain the composite...

Embodiment 2

[0046] 1) First, put 84g TiB 2 Powder, 36g of stainless steel powder, 1.42g of ammonium citrate and 0.71g of carboxymethyl cellulose were added to 32mL of deionized water and 8mL of silica sol were added, and stirred well to obtain a ceramic slurry suspension;

[0047] 2) Secondly, select 15PPI soft polyurethane foam, dip it in the ceramic slurry, take it out after 5 minutes and squeeze out the excess slurry;

[0048] 3) After drying the impregnated organic foam, raise the temperature from room temperature to 800°C at a rate of 2°C / min in a vacuum furnace and keep it warm for 60 minutes, then raise the temperature to 1000°C at a rate of 9°C / min, and then Sinter at a rate of 2°C / min to 1550°C for 1.5 hours, and cool down with the furnace to obtain a porous mesh preform;

[0049] 4) Fix the prefabricated body on the end surface or the working surface of the casting mold, pour the metal liquid of the steel matrix material by casting infiltration process, and obtain the composite...

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Abstract

The invention discloses a preparation method of a porous reticulated ceramic enhanced steel-based compound brake block. The method includes the steps: mixing TiB2 powder and additives, and adding mixture into deionized water to sufficiently stir the mixture to prepare ceramic slurry suspension liquid; soaking organic foam bodies into ceramic slurry, drying soaked organic foam bodies, and sinteringthe dried organic foam bodies at high temperature to obtain porous reticulated TiB2 prefabricated bodies; casing the prepared porous reticulated TiB2 prefabricated bodies with metal solution by the aid of a cast-penetration process, and performing cooling and de-molding to obtain the porous reticulated ceramic enhanced steel-based compound brake block. The prepared compound brake block is high infriction coefficient and low in heat expansion coefficient, inter stress of the brake block is uniform, strength and toughness are enhanced, and the service life of the brake block is prolonged.

Description

technical field [0001] The invention belongs to the technical field of preparation of wear-resistant materials, and in particular relates to a method for preparing a porous mesh ceramic reinforced steel-based composite brake block. Background technique [0002] With the rapid development of my country's high-speed railway, more stringent requirements are put forward for the braking performance of the train. The performance of the brake block in the braking system has a great influence on the braking effect of the train. At present, the emergency braking of the train is mainly realized by the friction between the brake disc and the friction pair of the brake block in the vehicle braking system. The material of the brake block should have the characteristics of strong heat resistance, small wear, high friction coefficient, and high mechanical strength. . porous network TiB 2 The ceramic-reinforced steel-based composite brake block is metallurgically smelted by casting to cas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D23/04C22C37/10C22C37/06
CPCB22D23/04C22C37/06C22C37/10
Inventor 李烨飞陈璐郑巧玲王娟郑开宏陈志高义民
Owner XI AN JIAOTONG UNIV
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