Preparation method of powder metallurgy friction material and friction block

A technology of powder metallurgy and friction materials, which is applied in the field of powder metallurgy friction materials, can solve the problems of decreased braking stability and wear deterioration, and achieve the effects of reduced quantity, small wear, and improved material toughness

Active Publication Date: 2020-07-10
UNIV OF SCI & TECH BEIJING
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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 solve the problems of the existing copper-based powder metallurgy brake pads that the braking stability decreases and the wear deteriorates under high-speed and high-temperature conditions, and further provide a brake pad material with stable friction performance and low wear under high-speed conditions. Its preparation technology

Method used

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  • Preparation method of powder metallurgy friction material and friction block
  • Preparation method of powder metallurgy friction material and friction block
  • Preparation method of powder metallurgy friction material and friction block

Examples

Experimental program
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Effect test

Embodiment 1

[0050] In this embodiment, the powder metallurgy friction material with low wear and high stability includes the following components by weight: 54% copper powder, 22% iron powder, 10% ferrochrome powder, 1% sodium titanate whisker, chromium powder 0.5%, graphite 9%, molybdenum disulfide 2.5%, polyvinyl alcohol 1%. Wherein, the sodium titanate whisker has a length of 50-80 μm and an aspect ratio of 6-8:1.

[0051] The metal powder (copper, iron, chromium) and whiskers in the above powder are ball milled and mixed according to the weight percentage to obtain the mixed powder 1. Ball-to-material ratio: 1:3; ball material: steel ball; ball milling medium: ethanol; atmosphere: Ar; ball milling time: 2 hours, speed: 200rpm. Then mix the mixed powder 1 and other powders according to the weight percentage, put them in a ball mill mixer and mix them evenly to obtain the mixed powder 2. Sodium titanate / potassium Sodium titanate / potassium The obtained mixed powder 2 is pressed with a ...

Embodiment 2

[0054] This embodiment is based on the embodiment 1, and the percentage content of potassium titanate whiskers is adjusted to 1.5%. It specifically includes the following components by weight: 53% copper powder, 22% iron powder, 10% ferrochrome powder, 1.5% sodium titanate whisker, 1% chromium powder, 9% graphite, 2.5% molybdenum disulfide, polyethylene Alcohol 1%. Other operations are all the same as in Example 1.

Embodiment 3

[0056] In this embodiment, the powder metallurgy friction material with low wear and high stability includes the following components by weight: copper powder 59%, iron powder 18%, ferrochrome powder 6%, potassium titanate whiskers 2%, chromium powder 1%, graphite 11%, molybdenum disulfide 1%, polyvinyl alcohol 2%. Wherein, the potassium titanate whisker has a length of 80-100 μm and an aspect ratio of 8-10:1.

[0057] The metal powder (copper, iron, chromium) and whiskers in the above powder are ball milled and mixed according to the weight percentage to obtain the mixed powder 1. The ball-to-material ratio is 1:7; the ball material is steel ball; the milling medium is ethanol; the atmosphere is Ar; the milling time is 3 hours, and the rotational speed is 120rpm. Then mix the mixed powder 1 and other powders according to the weight percentage, put them in a ball mill mixer and mix them evenly to obtain the mixed powder 2. Sodium titanate / potassium Sodium titanate / potassium ...

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Abstract

The invention provides a low-wear and high-stability powder metallurgy friction material for high-speed train brakes and a preparation method of a friction block, and belongs to the technical field ofpowder metallurgy friction materials. A formula of the powder metallurgy friction material comprises the following components in percent by weight: 40-65% of copper powder, 16-35% of iron powder, 5-15% of ferrochrome powder, 0.6-6% of ceramic fiber, 0.5-3% of chromium powder, 7-15% of graphite, 1-6% of molybdenum disulfide and 0.5-4% of polyvinyl alcohol. The preparation method comprises the following steps: 1, proportioning materials in percent by weight, and uniformly mixing to obtain mixed powder; 2, pressing the mixed powder obtained in the step 1 together with a friction block back plateto obtain a blank; 3, preparing the needed friction material from the blank obtained in the step 2 by a high-temperature sintering technology. A brake pad made of the friction material has the advantages of high and stable friction coefficient, small wear, long service life and the like in the case of high-speed braking.

Description

technical field [0001] The invention relates to the field of powder metallurgy friction materials, in particular to a low-wear and high-stability powder metallurgy friction material for high-speed train brake pads and a method for preparing a friction block. Background technique [0002] Friction material is a structural-functional composite material that converts the kinetic energy of a moving object into heat energy by using the friction generated by its contact with the dual material. It is an indispensable material in brakes, clutches and friction transmissions of various mechanical equipment. one. Its friction stability, wear resistance, heat resistance, and anti-fatigue characteristics determine whether the equipment can run smoothly and safely. [0003] With the increasingly frequent flow of population, economy, and production factors, higher and higher requirements are placed on the speed of railway transportation. Due to low strength, poor heat resistance, and sev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C47/14C22C49/02C22C49/14B22F9/04B22F3/02B22F3/10C22C101/00
CPCB22F3/02B22F3/1007B22F9/04B22F2009/042B22F2009/043B22F2998/10B22F2999/00C22C47/14C22C49/02C22C49/14B22F2201/11B22F2201/02B22F2201/013
Inventor 燕青芝彭韬张肖璐
Owner UNIV OF SCI & TECH BEIJING
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