Metallic carbide/carbon composite coating on surface of carbon material and preparation method thereof

A surface metal and alkali metal chloride technology, applied in carbon fiber, textiles, papermaking, fiber treatment, etc., can solve the problems of difficult control of coating thickness and shape, difficult actual operation, high cost of raw materials, etc., to achieve coating thickness and shape The effects of controllability, elimination of mismatching factors, and low cost of raw materials

Inactive Publication Date: 2009-11-04
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, chemical vapor deposition is mainly used to prepare most transition metal carbide coatings. Generally, the deposition temperature is high (such as NbC: 1500-1900 ° C), and the thickness and shape of the coating are not easy to control; the transition metal gas source used in the deposition method, such as TaCl 5 , NbCl 5 , ZrCl 4 , HfF 4 etc. are not only highly corrosive but also have high cost of raw materials, which bring difficulties to practical operation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] A metal carbide / carbon composite coating on the surface of a carbon material and a preparation method thereof: the carbon fiber is placed in a chemical vapor deposition furnace, and the flow rates of 100 to 300 sccm and 100 to 300 sccm of propylene and nitrogen are respectively introduced into the furnace, and at the same time Heat up to 700-800°C at a heating rate of 1-3°C / min, keep warm for 40-50h, stop feeding propylene gas, and feed nitrogen until the furnace temperature drops to room temperature, open the furnace and take out the pyrolytic carbon coating deposited on the surface carbon fiber. Then place the carbon fiber in a crucible, cover the carbon fiber with a mixture of 1 to 1.2 times the auxiliary agent of the carbon fiber and 0.01 to 0.1 times the zirconium powder, under the protection of a nitrogen atmosphere, at a temperature of 1 to 4 °C / min Heating at a heating rate of 600-700°C, keeping the temperature for 1-3 hours, then cooling to room temperature, ta...

Embodiment 2

[0016] A metal carbide / carbon composite coating on the surface of a carbon material and a preparation method thereof: the carbon fiber is placed in a chemical vapor deposition furnace, and propylene and nitrogen gas with a flow rate of 600-700 sccm and 1000-1500 sccm are respectively introduced into the furnace, and at the same time Heat to 800-900°C at a heating rate of 3-5°C / min, keep it warm for 50-60h, stop feeding propylene gas, feed nitrogen gas until the furnace temperature drops to room temperature, open the furnace and take out the pyrolytic carbon coating deposited on the surface carbon fiber. Then place the carbon fiber in the crucible, cover the carbon fiber with 1.1 to 1.2 times the auxiliary agent and 0.1 to 0.2 times the mixture of hafnium powder and tantalum powder, under the protection of nitrogen atmosphere, with 3 to 5 The heating rate of ℃ / min is heated to 700-1000 ℃, kept for 3-5 hours, then cooled to room temperature, the product after reaction is taken o...

Embodiment 3

[0020] A metal carbide / carbon composite coating on the surface of a carbon material and a preparation method thereof: the carbon fiber is placed in a chemical vapor deposition furnace, and the flow rates of 300-400 sccm and 3000-800 sccm of propylene and nitrogen are respectively introduced into the furnace, and at the same time Heat up to 800-1000°C at a heating rate of 5-8°C / min, keep warm for 60-80h, stop feeding propylene gas, and feed nitrogen until the furnace temperature drops to room temperature, open the furnace and take out the pyrolytic carbon coating deposited on the surface carbon fiber. Then place the carbon fiber in the crucible, cover the carbon fiber with a mixture of 1.2 to 1.3 times the auxiliary agent and 0.2 to 0.4 times the hafnium powder, and under the protection of nitrogen atmosphere, the Heating at a heating rate of 800-900°C, keeping the temperature for 5-8 hours, then cooling to room temperature, taking out the reacted product, washing with water an...

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Abstract

The invention relates to a metallic carbide/carbon composite coating prepared on the surface of a carbon material and a method thereof. The method comprises the following steps: placing the carbon material into a chemical vapor deposition furnace, introducing propylene and nitrogen of which flow rates are 100 to 800sccm and 100 to 2,000sccm respectively into the furnace, simultaneously heating the carbon material to between 700 and 1,300 DEG C at a rate of 1 to 20 DEG C per minute, and preserving the heat for 40 to 120 hours to obtain the carbon material of which surface is deposited with a pyrolytic carbon coating; placing the carbon material into a crucible, covering a mixture of 1 to 1.9 times of assistant and 0.01 to 1.2 times of transition metal powder in terms of the carbon material on the carbon material, heating the carbon material to between 600 and 1,200 DEG C at a rate of 1 to 30 DEG C per minute under the atmosphere of the nitrogen, preserving the heat for 1 to 20 hours, cooling the mixture and then taking out a product, washing the product by water and drying the product to obtain the composite coating. The method can prepare various transition metallic carbide/carbon composite coatings on the surface of the carbon material, the thickness and form of the coating are controllable, the combination of the coating and the carbon material basal body is good, and the properties of high-temperature oxidation resistance and ablation resistance of a base material are improved.

Description

technical field [0001] The invention belongs to the technical field of metal carbide / carbon composite coating on the surface of carbon materials. Specifically relates to a molten salt reaction / chemical vapor deposition process for preparing a metal carbide / carbon composite coating on the surface of a carbon material and a method thereof. Background technique [0002] Transition metal carbides are a class of mesenchymal compounds produced by embedding carbon atoms into transition metal lattices, which have the properties of covalent solids, ionic crystals, and transition metals. In general, transition metal carbide materials of Group IV-VI (except Cr) have high melting points (VC: 2830°C; ZrC: 3530°C; NbC: 3500°C; MoC: 2692°C; HfC: 3887°C; TaC: 3800°C ; WC: above 1600°C), high hardness (Mohs: 8~9), high wear resistance, corrosion resistance, strong thermal shock resistance, good chemical stability, strong thermal stability at high temperatures, and chemical compatibility wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/50C04B41/52C04B41/85C04B41/89D06M11/73D06M11/74D06M101/40
Inventor 姜召阳李轩科董志军袁观明胡子君
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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