A kind of preparation method of zrc coating on the surface of c/c composite material

A composite material and coating technology, which is applied in the field of preparation of C/C composite surface coatings, can solve the problems that the coating is prone to cracking and peeling, the residual stress of interface bonding is large, and the cost of coating preparation is high. Effects of thermal residual stress, high coating bond strength and short cycle time

Inactive Publication Date: 2020-10-27
ACADEMY OF ARMORED FORCES ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of chemical vapor deposition coating preparation is high, and HCl is generated during the coating preparation process, which is highly corrosive to equipment.
In addition, the ZrC coating prepared by the chemical vapor deposition method is in direct contact with the C / C composite substrate, and the residual stress at the interface is large, and the coating is prone to cracking and peeling off when it is subjected to a large thermal shock.

Method used

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  • A kind of preparation method of zrc coating on the surface of c/c composite material
  • A kind of preparation method of zrc coating on the surface of c/c composite material
  • A kind of preparation method of zrc coating on the surface of c/c composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Set the density to 1.83g / cm 3 The C / C composite material was cut into small pieces of 20 mm × 20 mm × 5 mm, and polished with 400, 1200 and 2400 sandpaper respectively; ultrasonic cleaning in water and acetone for 10 minutes; drying in a drying oven at 200 ° C for 30 minutes, and then Heating in a muffle furnace at 400°C for 60 minutes, cooling for later use. Take by weighing 112 grams of silicon powder (purity 99.5%) and 91 grams of zirconium powder (purity 99.5%) respectively, put into the electric arc melting furnace after grinding evenly in the mortar and melt into Si-Zr alloy block, the alloy block that smelts is good Crush and set aside. Put the treated C / C composite material and pulverized Si-Zr alloy into graphite crucible, then put the graphite crucible into high vacuum sintering furnace, and evacuate to 9×10 -2 Pa; start the heating program, heat up to 1600°C at a heating rate of 10°C / min, and hold for 3 hours; after the heat preservation is completed, cool ...

Embodiment 2

[0030] Set the density to 1.68g / cm 3 The C / C composite material was cut into small pieces of 40 × 20 × 5mm, and polished with 400, 800 and 1200 sandpaper respectively; ultrasonic cleaning in water and acetone for 10 minutes; drying in a drying oven at 100°C for 50 minutes, and then Heated in a muffle furnace at 500°C for 40 minutes, cooled for later use. Take by weighing 126 grams of silicon powder (purity 99.5%) and 45.6 grams of zirconium powder (purity 99.5%) respectively, put into the electric arc melting furnace after grinding evenly in the mortar and melt into Si-Zr alloy block, the alloy block that smelts is good Crush and set aside. Put the C / C composite material and the pulverized Si-Zr alloy into the graphite crucible, then put the graphite crucible into the high vacuum sintering furnace, evacuate to 5Pa; start the heating program, and heat up to 1800°C at a heating rate of 15°C / min ℃, heat preservation for 1h; after the heat preservation is completed, cool to 400 ...

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Abstract

The invention relates to a method for preparing a C / C composite material surface ZrC coating. The method comprises the step (1) of preprocessing a C / C composite material;the step (2) of preparing an alloy raw material, and smelting the alloy raw material to obtain a Si-Zr alloy for liquid-phase reaction sintering; the step (3) of placing the liquid-phase reaction sintering alloy and the C / C composite material in a graphite crucible, and placing the graphite crucible in a high vacuum carbon tube sintering furnace; performing vacuumizing, and performing heating to a liquid-phase reaction sintering temperature for heat insulation; after the heat insulation is over, performing cooling and discharging out of the furnace, and obtaining the C / C composite material surface ZrC coating. The method is simple to operate, short in period and low in cost, the prepared ZrC coating and a base body are high in bonding strength, and the thermal cycle resistance and impact resistance properties are good.

Description

technical field [0001] The invention relates to a method for preparing a surface coating of a C / C composite material, in particular to a high-efficiency and low-cost preparation method for a high-bonding-strength ablation-resistant ZrC coating on the surface of a C / C composite material. Background technique [0002] The high-temperature-resistant components of reusable spacecraft, solid rocket motor nozzles and hypersonic vehicles have service temperatures as high as 1800°C and withstand the erosion of high-pressure airflow and high-speed particles in an ablation environment. High temperature resistant structural materials have become the key to promote the development of this field. [0003] C / C composite material is a composite material composed of carbon fiber reinforced phase and carbon matrix phase, with low density, high strength, high thermal shock resistance, low thermal expansion coefficient, zero humidity expansion, high temperature strength and modulus with temper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/83C04B41/5059C04B41/4545C04B41/455C04B41/5057
Inventor 仝永刚白书欣梁秀兵陈永雄蔡志海刘军柳建张志彬
Owner ACADEMY OF ARMORED FORCES ENG PLA
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