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Novel glassy carbon preparation method

A glassy carbon, a new type of technology, applied in the field of preparation of high-performance new glassy carbon, can solve the problems of not being preserved, and achieve the effect of adjustable sample size, industrialized mass production, and cheap and easy-to-obtain raw materials

Pending Publication Date: 2019-04-05
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Professor Wendy L. Mao of Stanford University in the United States compressed glassy carbon to 44GPa at room temperature, and discovered the pressure-induced sp 2 to sp 3 A continuous change in bonding, however a reversible change occurs after depressurization and cannot be preserved

Method used

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  • Novel glassy carbon preparation method

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Experimental program
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preparation example Construction

[0025] This invention clearly sets forth a kind of preparation method of novel glassy carbon, which comprises the steps:

[0026] (1) processing the glassy carbon block into a cylindrical prefabricated body of predetermined size;

[0027] (2) Put the prefabricated body in the step (1) into a boron nitride crucible, then put it into a graphite tube heating body, and then pack it together into a pyrophyllite synthesis cavity to make an assembly block. to dry;

[0028] (3) Cool the dried assembly block in step (2), and then perform high temperature and high pressure operation: synthesis pressure 1-6GPa, temperature 25-2000°C, heat preservation for 15-120 minutes; then perform pressure relief after cooling operation again operate;

[0029] (4) Take out the assembly block to obtain a complete black opaque new glassy carbon block.

[0030] In a preferred embodiment of the present invention, the drying operation temperature in step (2) is 180°C.

[0031] In a preferred embodiment...

Embodiment 1

[0037] Ordinary rod-shaped glass carbon (Glass carbon) produced by Alfa Aisha Chemical Co., Ltd. is processed into a cylindrical green body with a diameter of 1-10 mm. Utilize X-ray diffractometer (Rigaku D / max-2500 / PC) to analyze it, such as figure 1 As shown, it can be seen that the diffraction peak of ordinary glassy carbon is relatively broad, which is an amorphous carbon. Use diamond abrasive paste to polish both sides of this sample, and use nano indenter (Nano Indenter G200) to test sample, the hardness that obtains sample is 4.2GPa, Young's modulus is 29GPa, elastic recovery rate is 87%, test result is as follows figure 2 shown. The compressive strength of ordinary glassy carbon is 1.5GPa measured by the miniature compression stretching machine, and the test results are as follows image 3 shown.

Embodiment 2

[0039] Put the green body prepared in Example 1 into a hexagonal boron nitride (hBN) crucible, pack the boron nitride tube with the green body into a graphite heating body, then put it into a pyrophyllite synthesis cavity, and assemble Put the block into a high-pressure high-temperature synthesis device, the synthesis pressure is 1GPa, the temperature range is 25-2000°C, and the pressure is maintained for 60 minutes. After the heating is stopped, the sample is naturally cooled to room temperature and then the pressure is released to obtain a new glassy carbon material. Use diamond grinding paste to polish both sides of the sample prepared under this condition, and use a nano indenter (Nano Indenter G200) to test the sample, and the hardness range of the sample is 4.8-6.2GPa, the Young's modulus range is 38-48GPa, The elastic recovery rate is 87-90%.

[0040] Utilize X-ray diffractometer (Rigaku D / max-2500 / PC) to analyze the sample, such as figure 1 shown. Using the weighing ...

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Abstract

The invention discloses a novel glassy carbon preparation method, and belongs to the field of inorganic nonmetallic materials. According to the method, common glassy carbon mainly serves as a raw material, and a high-pressure experimentation is implemented by the aid of a domestic CS-1B type 6-surface diamond presser. A novel glassy carbon material with excellent mechanical performance is acquiredby adjusting and controlling relationships among pressure, temperature and temperature keeping time under experiment conditions of the pressure of 1-6GPa, the temperature of 25-2000 DEG C and pressure and temperature keeping time of 15-120 minutes. The novel glassy carbon prepared by the method had more excellent mechanical performance, compressive strength can reach 2.5GPa, hardness can reach 10GPa and is double of that of common glassy carbon, and the elastic recovery rate of an indentation reaches up to 86-90%. The prepared novel glassy carbon material is simple in preparation process, canbe massively produced and has considerable application prospects in the application fields of all current common glassy carbon, and the used raw materials are low in coat and easy to get.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a method for preparing high-performance novel glassy carbon under high-temperature and high-pressure conditions by using ordinary glassy carbon as a raw material. Background technique [0002] Carbon has many allotropes, and the appearance of each allotrope has greatly promoted the development of science and technology and social progress. These allotropes usually exist in a metastable state, such as diamond, fullerene, carbon nanotubes, graphene, etc. are all metastable materials, among which the discoverers of fullerene and graphene were awarded the Nobel Prize in Chemistry in 1996. Award and the 2010 Nobel Prize in Physics. The various allotropes of carbon originate from its sp, sp 2 and sp 3 Three types of hybridization. Different hybridization methods often exhibit distinct physical and chemical properties. Carbon configurations with two or more hybridizati...

Claims

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Application Information

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IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 赵智胜胡盟张洋刘兵罗坤何巨龙于栋利徐波田永君
Owner YANSHAN UNIV