Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for preparing high-quality graphite monocrystal

A high-quality, graphite technology, applied in the direction of single crystal growth, single crystal growth, chemical instruments and methods, etc., can solve the problem of high preparation temperature, and achieve the effect of simple operation, simple process flow and low price

Inactive Publication Date: 2015-07-15
南京奥依菲光电科技有限公司
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcoming that the artificial graphite preparation temperature is too high, the present invention provides a method for preparing high-quality graphite single crystal, utilizing a "eutectic-crystallization" method, using transition metals (or transition metals) at lower temperatures Compounds) convert carbon raw materials into high-quality graphite single crystals

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing high-quality graphite monocrystal
  • Method for preparing high-quality graphite monocrystal
  • Method for preparing high-quality graphite monocrystal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Prepare the premix

[0032] Take 0.3 grams of high-purity carbon powder (purity>99%) and 11 grams of nickel powder (purity>99%) and mix evenly.

[0033] (2) heat treatment

[0034] The mixture was put into an alumina crucible, and the crucible was placed in a muffle furnace. The muffle furnace was evacuated and filled with argon gas for three times, and finally the sample was protected by argon gas. Substitute the ratio in step (1) into the formula to get (-28.88x 2 +422.89x+582.55)=1501.7°C, so the temperature in the furnace is raised to 1510°C, and kept at this temperature for 30 minutes.

[0035] (3) cooling

[0036] The muffle furnace was cooled to 500°C at a rate of 1°C / min, and then cooled to room temperature naturally.

[0037] (4) Separation of graphite

[0038] The sample is taken out from the alumina crucible, and the obtained material has two layers, the upper layer and the upper layer are graphite products after mechanical peeling.

[0039] (5) Sam...

Embodiment 2

[0042] (1) Prepare the premix

[0043] Take 1 gram of coke (carbon content>99%) and 30 grams of cobalt oxide (purity>99.5%, wherein the content of cobalt element is 23.6 grams) and mix evenly.

[0044] (2) heat treatment

[0045] The mixture was put into an alumina crucible, and the crucible was placed in a muffle furnace. The muffle furnace was evacuated and filled with argon gas for three times, and finally the sample was protected by argon gas. Substitute the ratio in step (1) into the formula to get (-42.16x 2 +604.72x+5.15)=1777.1°C, so the temperature in the furnace is raised to 1900°C, and kept at this temperature for 60 minutes.

[0046] (3) cooling

[0047] The muffle furnace was cooled to 500°C at a rate of 1°C / min, and then cooled to room temperature naturally.

[0048] (4) Separation of graphite

[0049] The sample is taken out from the alumina crucible, and the obtained material has two layers, the upper layer and the upper layer are graphite products after m...

Embodiment 3

[0053] (1) Prepare the premix

[0054] Take 5 grams of asphalt (carbon content>99%) and 250 grams of ferrous nitrate (purity>99.5%, wherein the iron element content is 77.8 grams) and mix evenly.

[0055] (2) heat treatment

[0056] The mixture was put into an alumina crucible, and the crucible was placed in a muffle furnace. The muffle furnace was evacuated and filled with argon gas for three times, and finally the sample was protected by argon gas. Substitute the ratio in step (1) into the formula to get (-10.84x 2 +151.77x+692.93)=1214.1°C, so the temperature in the furnace is raised to 1220°C, and kept at this temperature for 90 minutes.

[0057] (3) cooling

[0058] The muffle furnace was cooled to 500°C at a rate of 1°C / min, and then cooled to room temperature naturally.

[0059] (4) Separation of graphite

[0060] The sample is taken out from the alumina crucible, and the obtained material has two layers, the upper layer and the upper layer are graphite products af...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
diffraction angleaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a high-quality graphite monocrystal. The method adopts a comelting-crystallization process and comprises the following steps: uniformly mixing a transition metal or transition metal compound with a carbon raw material, heating to form a comelt, cooling to obtain a metal / graphite two-phase separation body, and carrying out mechanical separation to obtain the high-performance heat-conducting graphite. The high-quality graphite monocrystal prepared by the method has high crystallinity; and the grain size can reach Lc(002)=100nm, and the interplanar distance is d(002)=0.335nm, which are respectively higher than the index of the highly-oriented pyrolytic graphite.

Description

technical field [0001] The invention relates to the field of preparing artificial graphite, and specifically refers to a method for converting carbon raw materials into high-quality graphite single crystals at a relatively low temperature by using a "eutectic-crystallization" method. Background technique [0002] Graphite single crystal refers to a graphite material with a structure close to an ideal crystal. Its main applications include research and application fields such as X-ray monochromators, neutron filters and monochromators, and high-performance thermal conductivity applications. [0003] Taking the field of high-performance thermal conductivity applications as an example, traditional high thermal conductivity materials are mostly metal materials, such as gold, silver, copper, aluminum, etc. In addition to being expensive and dense, these metallic materials have incompatible coefficients of thermal expansion with semiconductors, which can disrupt the thermal interf...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C30B3/00C30B29/02
Inventor 余柯涵韦玮吕鹏
Owner 南京奥依菲光电科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com