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Method for preparing iron-based friction material by utilizing vacuum carbothermal in-situ reactive sintering from vanadium-titanium magnetite

A technology of vanadium-titanium magnetite and vanadium-titanium magnetite concentrate, which is applied in the field of preparation of iron-based friction materials, can solve the problems of harsh preparation conditions, affecting the use effect, interface pollution, etc., and achieve the effect of saving equipment investment costs

Active Publication Date: 2013-12-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This process is mainly to improve the performance of the material through sintering and densification. Generally, there is no chemical reaction to form new substances. The poor wettability between them leads to poor bonding, so that the components are peeled off from the matrix during the friction process, which seriously affects the use effect
But the fly in the ointment is that the technical solution disclosed in ZL201210256454.6 must rely on the hot-pressing sintering function of the vacuum hot-pressing furnace to obtain a relatively dense iron-based friction material, making the existence of a vacuum hot-pressing sintering furnace a necessary prerequisite for the implementation of the technical solution conditions, leading to harsh preparation conditions and large investment in equipment
There is no literature on how to prepare iron-based friction materials by using the vacuum carbon thermal in-situ reaction sintering method without hot-pressing sintering, and obtain iron-based friction materials with comparable densification to report

Method used

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  • Method for preparing iron-based friction material by utilizing vacuum carbothermal in-situ reactive sintering from vanadium-titanium magnetite
  • Method for preparing iron-based friction material by utilizing vacuum carbothermal in-situ reactive sintering from vanadium-titanium magnetite
  • Method for preparing iron-based friction material by utilizing vacuum carbothermal in-situ reactive sintering from vanadium-titanium magnetite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Put 100g of vanadium-titanium magnetite concentrate powder with a particle size of 200 mesh (mole number 1) and reducing agent graphite powder 20.28g (mole number 1.69) into the ball mill, add ceramic balls according to the ball-to-material ratio of 2:1, and then rotate at a speed of 200rpm Ball milling and mixing for 3 hours, then put the ball mill mixture into a vacuum sintering furnace to raise the temperature to 1290°C at a heating rate of 8°C / min, and keep warm for 2h to carry out vacuum carbon thermal pre-reduction; first vacuum pre-reduction powder and iron powder 73.36g (mol 1.31), copper powder 8.96g (mole number 0.14), tin powder 2.38g (mole number 0.02), lead powder 2.07g (mole number 0.01) and an appropriate amount of alcohol are put into the ball mill, and the ball-to-material ratio is 2:1. Ball mill and mix for 3 hours at a speed of 300rpm, then add lubricant graphite powder 10.44g (mole number 0.87) and zinc stearate powder 1.90g (mole number 0.003) to con...

Embodiment 2

[0032] Put 100g of vanadium-titanium magnetite concentrate powder with a particle size of 300 mesh (mole number 1) and reducing agent graphite powder 20.28g (mole number 1.69) into the ball mill, add ceramic balls at a ball-to-material ratio of 2:1, and then rotate at a speed of 200rpm Ball milling and mixing for 3 hours, then put the ball mill mixture into a vacuum sintering furnace to raise the temperature to 1290°C at a heating rate of 10°C / min, and keep warm for 2h for vacuum carbon thermal pre-reduction; first, vacuum pre-reduction powder and iron powder 73.36g 1.31), copper powder 8.96g (mole number 0.14), tin powder 2.38g (mole number 0.02), lead powder 2.07g (mole number 0.01) and an appropriate amount of alcohol are put into the ball mill, and the ball-to-material ratio is 2:1. Ball mill and mix for 3 hours at a speed of 300rpm, then add lubricant graphite powder 10.44g (mole number 0.87) and zinc stearate powder 1.90g (mole number 0.003) to continue ball milling evenl...

Embodiment 3

[0035] Put 100g of vanadium-titanium magnetite concentrate powder with a particle size of 250 mesh (mole number 1) and reducing agent graphite powder 20.28g (mole number 1.69) into the ball mill, add ceramic balls according to the ball-to-material ratio of 2:1, and then at a speed of 400rpm Ball milling and mixing for 2 hours, then put the ball milled mixture into a vacuum sintering furnace to raise the temperature to 1260°C at a heating rate of 9°C / min, and keep it warm for 1h to carry out vacuum carbon thermal pre-reduction; first vacuum pre-reduction powder and iron powder 39.2g 0.7), tin powder 4.76g (mole number 0.04), lead powder 2.07g (mole number 0.01) and an appropriate amount of alcohol are put into the ball mill, continue to ball mill and mix at a speed of 350rpm according to the ratio of ball to material 2:1 for 2 hours, and then add lubrication 18.49g of graphite powder (mole number 1.54) and 1.26g (mole number of 0.002) of zinc stearate powder were ball-milled eve...

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Abstract

The invention discloses a method for preparing an iron-based friction material by utilizing vacuum carbothermal in-situ reactive sintering from a vanadium-titanium magnetite. The method comprises the following steps of firstly carrying out ball-milling on and uniformly mixing vanadium-titanium magnetite concentrate powder and graphite powder which is utilized as a reducing agent, secondly carrying out vacuum carbothermal pre-reduction on the mixed powder, thirdly carrying out secondary ball-milling on and uniformly mixing the pre-reduced mixed powder, iron powder, graphite powder as a lubricating agent, copper powder, tin powder, lead powder and zinc stearate powder, fourthly carrying out cold-pressing on the mixture to form pressed blanks, and finally placing the pressed blanks in a vacuum sintering furnace to sinter to obtain the iron-based friction material. Because the invention utilizes the technical scheme of the combination of vacuum pre-reduction, cold-pressing and vacuum pressureless sintering, without hot-pressing sintering conditions, the iron-based friction material is prepared from natural vanadium-titanium magnetite concentrate powder; therefore, the blank that the iron-based friction material is prepared by utilizing a vacuum carbothermal in-situ reactive sintering method without the hot-pressing sintering conditions is filled up, the prepared material has the advantages of in-situ synthesis and powder metallurgy technology, and the material preparation can be realized based on the vacuum sintering furnace so that the investment cost of devices is largely reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of iron-based friction materials, and in particular relates to a method for preparing iron-based friction materials by utilizing vanadium-titanium-magnetite vacuum carbon thermal in-situ reaction sintering. Background technique [0002] With the continuous development of modern industry, iron-based friction materials have been widely used in clutches or brakes of aircraft, tanks, automobiles, ships, tractors, engineering machinery and machine tools due to their advantages of high temperature resistance, high strength and low price. . Iron-based friction materials are mainly composed of three parts: iron and iron alloy matrix, solid lubricant, and friction agent. The main component of the matrix is ​​iron. The alloying of iron can reduce the plasticity of iron and improve the strength, hardness, heat resistance and oxidation resistance; the lubricating component can improve the anti-seizure pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B22F1/00C22C33/02
Inventor 冯可芹张光明李莹邓伟林
Owner SICHUAN UNIV