A kind of preparation method of nanowire reinforced SIC wear-resistant coating

A wear-resistant coating and nanowire technology, which is applied in the field of preparation of nanowire-reinforced SiC wear-resistant coatings, can solve problems such as brittle fracture, coating peeling failure, etc., to reduce high-temperature wear rate, enhance wear resistance, Effect of improving wear resistance

Active Publication Date: 2014-10-29
无锡博智复合材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to avoid the deficiencies of the prior art, the present invention proposes a method for preparing a nanowire-reinforced SiC wear-resistant coating to overcome the brittle fracture of the SiC coating on the surface of the existing C / C composite material at high temperature and cause the coating Layer peeling failure defect

Method used

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  • A kind of preparation method of nanowire reinforced SIC wear-resistant coating
  • A kind of preparation method of nanowire reinforced SIC wear-resistant coating
  • A kind of preparation method of nanowire reinforced SIC wear-resistant coating

Examples

Experimental program
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Effect test

Embodiment 1

[0026] 1) Process the C / C composite material into 36mm × 8mm round block sample, cleaned after grinding and polishing, put into the oven to dry for later use.

[0027] 2) Weigh 15g of Si powder, 25g of C powder and 60g of SiO 2 pink. Place in a turpentine ball mill jar, put agate balls of different numbers and diameters into the ball mill jar, and perform ball milling and mixing treatment on a ball mill for 2 hours, and use it as a powder for later use.

[0028] 3) Put the powder into the graphite crucible so that the thickness of the powder is one-fifth of the depth of the crucible, then bind the baked C / C composite material sample with a bundle of carbon ropes and hang it above the powder, Then put the graphite crucible into a vacuum heating furnace with graphite as a heating element. The vacuum in the furnace chamber was evacuated to 1kPa, and then argon was passed to normal pressure. This process is repeated three times. Afterwards, the furnace temperature was raised...

Embodiment 2

[0032] 1) The density made by the isothermal chemical vapor infiltration method is 1.67-1.76g / cm 3 The carbon / carbon composite materials are processed into thin sheets and then used in turn with 400 # , 800 # , 1500 # Grinding and polishing with sandpaper to the sample size 32mm×6mm. Ultrasonic cleaning with tap water, acetone, absolute ethanol and distilled water respectively, and air-dried. When cleaning, the ultrasonic frequency used is 20KHZ, the power of ultrasonic is 100W, and the cleaning time is 25min.

[0033] 2) Weigh 10g of Si powder, 25g of C powder and 70g of SiO respectively 2 pink. Place in a turpentine ball mill jar, put agate balls of different numbers and different diameters into the turpentine ball mill jar, and carry out ball milling and mixing treatment on a planetary ball mill for 4 hours, and use it as a powder for later use.

[0034] 3) Put the powder into the graphite crucible so that the thickness of the powder is one-fifth of the depth of the...

Embodiment 3

[0038] 1) Change the size to The 36mm×8mm C / C composite material was polished with No. 400, No. 800 and No. 1000 sandpaper in turn, washed with absolute ethanol, and dried in an oven for later use.

[0039] 2) Weigh 15g of Si powder, 30g of C powder and 75g of SiO respectively 2 pink. Place in a turpentine ball mill jar, put agate balls of different numbers and diameters into the rosin ball mill jar, and perform ball milling and mixing treatment on a planetary ball mill for 3 hours, and use it as a powder for later use.

[0040] 3) Put the powder into the graphite crucible so that the thickness of the powder is one-fifth of the depth of the graphite crucible, then bind the baked C / C composite material with a bundle of 3K carbon fibers and hang it on the surface of the powder above, and then put the graphite crucible into the vacuum reactor. After evacuating for 30 minutes, make the vacuum degree reach 1kPa, keep the vacuum for 30 minutes, and observe whether the indication...

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Abstract

The invention relates to a preparation method of a nano-wire reinforced SiC wear-resistant coating. A porous SiC nano-wire layer is prepared on the surface of a C / C (Carbon / Carbon) composite material, and the fracture toughness of the SiC coating is effectively improved by utilizing the super-high strength and elasticity modulus of the SiC nanometer and the good bonding force of the SiC nanometer with a SiC coating matrix, so that the high-temperature wear rate of the SiC coating is reduced, and the wear-resistance of the coating is enhanced. After the SiC nano-wire is added, the wear rate of the SiC coating at 800 DEG C is reduced to 1.83*10<-4>mm<3>.N<-1>.m<-1> from 1.51*10<-3>mm<3>.N<-1>.m<-1>, that is, the wear rate is reduced by one order of magnitudes.

Description

technical field [0001] The invention relates to a method for preparing a nanowire-reinforced SiC wear-resistant coating, in particular to a method for preparing a SiC nanowire-reinforced SiC wear-resistant coating on the surface of a carbon / carbon (C / C) composite material or a graphite material. Background technique [0002] C / C composite materials have a series of excellent properties such as low density, high specific strength, high specific modulus, low thermal expansion coefficient, thermal shock resistance, etc., especially the unique property that the strength of this material does not decrease but increases with the increase of temperature. Making it used as a thermal structural part has advantages that other materials cannot match. However, C / C composites are easily oxidized in a high-temperature oxidizing atmosphere. The C / C composite material with SiC coating overcomes the shortcomings of C / C composite material that are easily oxidized in high-temperature aerobic ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/85
Inventor 李贺军陈梓山付前刚褚衍辉
Owner 无锡博智复合材料有限公司
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