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Pyrolytic graphite composite coating and applications thereof

A technology of pyrolytic graphite and composite coating, applied in the direction of coating, metal material coating process, phosphorus compound, etc., can solve the problems of low van der Waals bonding force between layers, affecting the appearance of products, and large distance between layers

Inactive Publication Date: 2010-03-03
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphite is a layered structure substance, the distance between layers is large, the Van der Waals binding force between layers is small, and the layers can slide. Therefore, in the reactor made of graphite, during the friction process with solid materials, the graphite powder on the graphite surface is easy to Slip and mix into solid matter, affecting product appearance

Method used

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  • Pyrolytic graphite composite coating and applications thereof
  • Pyrolytic graphite composite coating and applications thereof
  • Pyrolytic graphite composite coating and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The machined graphite blank body is placed in an intermediate frequency induction deposition furnace, and the graphite plate on which the coated product is placed is evenly drilled, and the vacuum system is started to make the pressure in the furnace reach a vacuum state. After confirming that there is no leakage in the system, it is powered on for heating To 1700°C, the holding time is 3 hours. When the furnace temperature reaches the specified requirements, turn on the ultrasonic cleaning device to clean the dust and other impurities on the graphite surface, and then feed 99.99% nitrogen and 75% propane in sequence according to the process regulations The hydrocarbon gas is continuously pumped out by the mechanical pump and discharged into the atmosphere. The pressure in the furnace is 4-8mmHg, the deposition time is 2-6 hours, and the cooling time is 3-6 hours. After the ventilation time reaches the process requirements, stop heating, and the furnace chamber is cooled ...

Embodiment 2

[0040] All the other operations are the same as in Example 1, the temperature in the furnace is increased by 100°C to 1800°C, and the holding time is shortened to 2.5 hours. Fill the alkane gas containing 80% propane and 99.99% nitrogen, and keep the rest of the conditions unchanged to prepare pyrolytic graphite coated products.

Embodiment 3

[0042] All the other operations are the same as in Example 1, the temperature in the furnace is increased by 100°C to 1900°C on the basis of Example 2, the holding time is shortened from half an hour to 2 hours on the basis of Example 2, and the furnace is filled with 85% The alkane gas of propane and the nitrogen of 99.99%, keep furnace pressure 6~8mmHg, deposition time 7~14 hours, cooling 6~8 hours, all the other conditions are identical with embodiment 1, make pyrolytic graphite coating product.

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Abstract

The invention relates to a pyrolytic graphite composite coating and applications thereof. The preparation method of the pyrolytic graphite composite coating comprises the following steps: the surfaceof the graphite is processed in a pyrolytic graphite coating mode to obtain the pyrolytic graphite composite coating; in the preparation process, pyrolysis, dehydrogenation and polymerization are carried out on the surface of the high-temperature graphite substrate by utilizing a chemical vapor deposition technique and using high-purity hydrocarbon gas or vapor, and the produced huge aromatic hydrocarbon molecules impact the surface of the high-temperature substrate so as to deposit carbon; and the pyrolytic graphite coating treatment is carried out in a medium-frequency induction deposition furnace. The invention has the advantages that erosion does not occur in the existence of phosphoric acid or ammonium phosphate salts at the high temperature of 300-320 DEG C, and no graphite powder slides into the reactor; and the pyrolytic graphite composite coating can be used for preparing crystal form II ammonium polyphosphate by using phosphoric acid or ammonium phosphate salts as the initialmaterial through the high-temperature polyreaction, and can also be used for other synthesizing high-temperature phosphoric acid and(or) high-temperature ammonium phosphate salts by using the reaction medium.

Description

【Technical field】 [0001] The invention relates to the technical field of ammonium polyphosphate equipment, in particular to a pyrolytic graphite composite coating and its application. 【Background technique】 [0002] Ammonium polyphosphate (referred to as APP) molecular formula (NH 4 ) n+2 P n o 3n+1 , the phosphorus content is 30-32%, and the nitrogen content is 14-16%. Hydrogen halides are not produced. APP has good thermal stability, the product is close to neutral, and can be mixed with other flame retardants. It has good dispersibility, smoke elimination, low toxicity, and is safe to use. Therefore, it is widely used in the preparation of intumescent flame retardants, fireproof coatings, Fireproof treatment of cables, flame retardancy of rubber and plastic products. [0003] For the preparation methods of crystalline type II APP, most of them use P 2 o 5 Ammonium phosphate and ammonium salt are used as starting materials, and are carried out under an ammonia atmo...

Claims

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Application Information

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IPC IPC(8): C23C16/26B01J19/02C01B25/40
Inventor 刘够生何志俊盛勇蹇民于建国
Owner EAST CHINA UNIV OF SCI & TECH
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