High-thermal-conductivity low-porosity graphite for curved glass hot bending mold and preparation method thereof

A curved glass and high thermal conductivity technology, which is applied in the field of graphite materials, can solve the problems of weak practicability and few subdivided application fields, and achieve the effects of improving the degree of compactness, improving the uniformity of material distribution, and reducing the coefficient of thermal expansion

Active Publication Date: 2021-02-05
HUNAN CHANGYU NEW CARBON MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Artificial graphite in the prior art is developing towards large specifications and high strength. The graphite produced is expected to be applied in various fields, but rarely subdivided into application fields. When encountering certain industries with high performance indicators, such large The practicability of "broad-spectrum" graphite is relatively weak

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A high thermal conductivity and low porosity graphite for curved glass hot bending molds of the present invention is mainly modified by petroleum coke powder with a mass ratio of 9:0.5:0.5, modified mesophase carbon microspheres, flake graphite and an appropriate amount of binder. It is prepared from high quality pitch (softening point 115° C.); wherein, the added amount of modified pitch is 30% of the total weight (modified pitch+petroleum coke powder+mesophase carbon microspheres+flaky graphite powder).

[0036] The preparation method of the high-thermal-conductivity low-porosity graphite that is used for the curved surface glass hot-bending mold of this implementation comprises the following steps:

[0037] (1) Respectively shape petroleum coke and flake graphite into fine powder with a particle size of D50=3μm for later use; mix mesophase carbon microspheres with ethanol solution (the mass ratio of mesophase carbon microspheres to ethanol solution is 1:1) Uniform, m...

Embodiment 2

[0049] The preparation process of the high thermal conductivity and low porosity graphite used for the curved glass hot bending mold of this embodiment is the same as that of Example 1, except that the quality of petroleum coke powder in step (1), changing pitch mesophase carbon microspheres and flake graphite The ratio is 8:1:1, and the volatile matter content of the mixture in step (4) accounts for 12.2wt% of the total mass of the mixture.

[0050] The pass rate of the final product is 78%. The performance of the prepared graphite is tested, and its average particle size is 4.5 microns; the bulk density is 1.78g / cm 3 , compression resistance 85.8MPa, flexural resistance 44.7Mpa, resistivity 14.2μΩ·m, porosity 18%, thermal expansion coefficient 5.2*10 -6 / ℃, thermal conductivity is 108W / (m·K).

Embodiment 3

[0052] The preparation process of the high thermal conductivity low-porosity graphite that is used for the curved surface glass hot-bending mold of the present embodiment is the same as that of Example 1, except that the mass ratio of petroleum coke powder, pitch mesophase carbon microspheres and flake graphite in step (1) is 7:1.5:1.5, the volatile content of the mixture in step (4) accounts for 12wt% of the total mass of the mixture.

[0053] The final sample pass rate is more than 70%. After graphitization detection, the average particle size is 4.9 microns; the bulk density is 1.77g / cm 3 , compression resistance 78Mpa, flexural resistance 38.9MPa, resistivity 13.8μΩ·m, porosity 20%, thermal expansion coefficient 5.8*10 -6 / °C, the thermal conductivity is 94W / (m·K).

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Abstract

The invention discloses high-thermal-conductivity low-porosity graphite for a curved glass hot bending mold. The thermal conductivity is not lower than 94W/(m.K), the porosity is not higher than 20%,the thermal expansion coefficient is not higher than 5.8 * 10<-6>/DEG C, and the average particle size is not higher than 5mu m. The preparation method of the graphite comprises the following steps: preparing petroleum coke powder, crystalline flake graphite powder and modified asphalt powder into modified asphalt coke flake powder, uniformly mixing the modified asphalt coke flake powder with modified mesocarbon microbeads, crushing, standing, carrying out isostatic pressing molding, roasting carbonization, dipping treatment and graphitization treatment to obtain the high-thermal-conductivitylow-porosity graphite. According to the graphite material, the petroleum coke powder is used as a main material, the modified asphalt mesocarbon microbeads and crystalline flake graphite are used as auxiliary materials, aggregate types and proportions are reasonably matched, mirror surface heat conduction, pores and expansion coefficients of the processed graphite material can be improved, the average particle size of the graphite material is not larger than 5 micrometers, and the graphite material can be applied to curved glass hot bending molds.

Description

technical field [0001] The invention relates to the field of graphite materials, in particular to a graphite with high thermal conductivity and low porosity for curved glass hot-bending molds and a preparation method thereof. Background technique [0002] The production of curved (2D, 2.5D, 3D) glass by hot bending is currently the most advanced and efficient method for producing curved glass. Hot bending forming is a precision forming technology, and the key technical equipment includes hot bending machine and hot bending mold. Hot bending dies can be divided into cemented carbide, die steel, WC, SiC, graphite, etc. according to the material. Metal materials (tungsten carbide, mold steel) change drastically with temperature, and the mold cannot be restored due to thermal deformation after a period of use; ceramic materials (WC, SiC, etc.) have a large thermal expansion coefficient, which may easily lead to large errors in the preparation of curved glass. It is suitable fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/532C04B35/622
CPCC04B35/522C04B35/532C04B35/622Y02P40/57
Inventor 杨程张蓉王新华刘金平吴志刚何成林黄斌陈帮智于新春陈红宋斌
Owner HUNAN CHANGYU NEW CARBON MATERIALS
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