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Carbon/carbon composite material modified by silicon carbide and hydroxyapatite gradient coating and preparation method thereof

A technology of carbon composite materials and hydroxyapatite, which is applied in the preparation of SiC-HA gradient coating modified carbon/carbon composite materials, in the fields of biological bone replacement and bone grafting, can solve the problems of thermal expansion coefficient mismatch of coatings, etc. Achieve the effects of reducing defects, improving bonding strength and corrosion resistance, and relieving thermal stress

Inactive Publication Date: 2018-09-18
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Benefits of technology

In this patented new technique for modifying carbon or graphene composites (CN) without losing their properties due to heat treatment during manufacturing processes like sintering them into specific shapes called CN). By adding an oxysilane layer onto top of the CNT layers after they have been treated at temperatures above 450°C, it becomes possible to create a more uniform structure compared to previous methods where different parts were mixed together. These techniques help prevent cracks from forming inside when subjected to temperature changes over time. Additionally, these modifications enhance adhesion between the coatings and the underlying metal component while reducing damage such as pitting. Overall, these improvements make better quality nanocarriers made up of multiple components combined within one composition.

Problems solved by technology

Technical Problem addressed in this patented study relates to finding ways to create layers made from ceramics called silicon carbide (SiC)-hydrogel), which could potentially provide better long term effects such as improved blood compatibility and reduced inflammability compared to current methods like titanium oxynitride(TiON). Silane coupling agents used during chemical vapor deposition process may cause cracks that affect the quality of the resulting films. To address these issues, an objective was proposed to develop a solution involving immerse sonic plasmas sprayed onto surfaces containing embedded calcium phosphate (CaHPO 3/H ) nanoparticles mixed together with other components including organosilanes.

Method used

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  • Carbon/carbon composite material modified by silicon carbide and hydroxyapatite gradient coating and preparation method thereof
  • Carbon/carbon composite material modified by silicon carbide and hydroxyapatite gradient coating and preparation method thereof
  • Carbon/carbon composite material modified by silicon carbide and hydroxyapatite gradient coating and preparation method thereof

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preparation example Construction

[0027] Step 2, preparation of SiC inner coating: Si powder with a mass fraction of 75% to 80%, C powder with 10% to 15%, and Al with 5% to 10% 2 o 3 The powder is mixed evenly with a ball mill, and then put into an oven for drying. Put the mixed powder and the carbon / carbon composite material obtained in step 1 evenly in a graphite crucible, cover the graphite cover and put it in a high-temperature furnace, treat it at 1900-2200°C for 1-3 hours, and cool with the furnace. The SiC inner coating can be prepared on the surface of the carbon / carbon composite material.

[0028] Step 3. Prepare the SiC-HA outer coating: Put the SiC powder with a mass fraction of 20% to 80% and the HA powder with a mass fraction of 20% to 80% into a ball mill and mix them together evenly and dry them. The granulator performs granulation on the mixed powder after ball milling. Place the sample obtained in step 2 under the supersonic plasma spraying equipment, set the spraying power to 25kW~55kW, th...

Embodiment approach 1

[0030] 1) Cut the carbon / carbon composite matrix (with a density of 1.40-1.78g / cm 3 ) Wash with acetone, alcohol and deionized water for 20-30 minutes in sequence until the carbon particles are cleaned, and then put the cleaned carbon / carbon composite material sample in an oven at 50-70°C to dry for 10-15 hours for later use .

[0031] 2) The preparation method of SiC inner coating: weigh the Si powder material that mass fraction is 77%, the C powder material of 15%, the Al of 8% 2 o 3Put the powder into the ball mill jar, mix the three kinds of powder evenly, dry, then put the mixed powder and the cleaned carbon / carbon composite material into the graphite dry pot, seal it with the crucible cover and put it in the high temperature After heat treatment at 1900°C (protective atmosphere: argon) in the furnace for 2 hours, the SiC inner coating can be obtained on the carbon / carbon composite material.

Embodiment approach 2

[0033] 1) Cut the carbon / carbon composite matrix (with a density of 1.40-1.78g / cm 3 ) Wash with acetone, alcohol and deionized water for 20-30 minutes in sequence until the carbon particles are cleaned, and then put the cleaned carbon / carbon composite material sample in an oven at 50-70°C to dry for 10-15 hours for later use .

[0034] 2) The preparation method of SiC inner coating: weigh the Si powder material that mass fraction is 77%, the C powder material of 15%, the Al of 8% 2 o 3 Put the powder into the ball mill jar, mix the three kinds of powder evenly, dry, then put the mixed powder and the cleaned carbon / carbon composite material into the graphite dry pot, seal it with the crucible cover and put it in the high temperature After heat treatment at 2000°C (protective atmosphere: argon) in the furnace for 2 hours, the SiC inner coating can be obtained on the carbon / carbon composite material.

[0035] 3) The preparation method of the SiC-HA outer coating: weigh SiC pow...

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Abstract

The invention relates to a carbon/carbon composite material modified by a silicon carbide and hydroxyapatite gradient coating and a preparation method thereof. A SiC coating and a SiC-HA coating are prepared on the surface of a carbon/carbon composite material by embedding and supersonic plasma spraying methods. The SiC coating prepared by the embedding method belongs to in-situ growth combinationof C and Si, and the SiC-HA coating and the SiC coating are gradient coatings, so that the SiC-HA coating and the SiC coating can be better fused, surface defects due to mismatch of thermal expansioncoefficients can be reduced, and bonding strength and corrosion resistance between the coating and a substrate can be improved. The thermal stress between the coating and the carbon/carbon compositesubstrate can be effectively reduced, generation of cracks can be reduced, and the compactness of the coating can be improved. The supersonic plasma spraying method is precise in control of parameters, can produce a uniform thickness coating, is low in requirements on components, and has a very broad application prospect in the biological field.

Description

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Claims

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Application Information

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Owner NORTHWESTERN POLYTECHNICAL UNIV
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