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Preparation method of carbon/carbon hot-pressing mold for high-pressure hot-pressing sintering furnace

A technology of hot-press sintering furnace and hot-press mould, which is applied in the direction of biofuels and waste fuels, can solve the problems of inconvenient firing and variability, and achieve the effects of saving hot-press energy consumption, prolonging service life, and excellent mechanical properties

Pending Publication Date: 2022-08-05
XIAN CHAOMA SCI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method avoids the damage of the radial carbon fibers by arranging continuous carbon fibers in the radial direction in advance, and then laying the circumferential and longitudinal carbon fibers, so that the circumferential and longitudinal carbon fibers remain complete and continuous, ensuring the strength and utilization of carbon fibers. , improve the overall structural strength of the three-dimensional structure prefabricated body, make the carbon / carbon hot pressing mold have excellent mechanical properties, uniform thermal field, and prolong the service life, and solve the problem of variability and inconvenient release of the carbon / carbon hot pressing mold during use problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment includes the following steps:

[0029] Step 1. According to the designed target product carbon / carbon hot pressing mold layup method, firstly pre-arrange continuous 3K pitch carbon fibers along the thickness direction of the layup, that is, in the radial direction, and then lay down 3K polypropylene along the hoop and longitudinal directions. Nitrile carbon fiber to obtain a bulk density of 1.0g / cm 3 3D structure prefab;

[0030] The included angle between the 3K polyacrylonitrile carbon fibers laid along the circumferential direction and the axial direction of the target product carbon / carbon hot pressing mold is 90°, and the 3K polyacrylonitrile carbon fibers laid along the longitudinal direction and the target product carbon / carbon The included angle of the carbon hot-pressing die in the axial direction is 60°, and it is laid layer by layer according to the angle change rule of -60°, +60°, and 90° and circulated to the required size of the outer diam...

Embodiment 2

[0038] This embodiment includes the following steps:

[0039] Step 1. According to the designed target product carbon / carbon hot pressing mold layup method, firstly arrange the continuous 12K polyacrylonitrile carbon fibers in advance along the thickness direction of the layup, that is, in the radial direction, and then lay down the 12K polyacrylonitrile carbon fibers along the hoop and longitudinal directions. pitch carbon fiber, to obtain a bulk density of 0.85g / cm 3 3D structure prefab;

[0040] The included angle between the 12K polyacrylonitrile carbon fibers laid along the circumferential direction and the axial direction of the target product carbon / carbon hot pressing mold is 60°, and the 12K pitch-based carbon fibers laid along the longitudinal direction and the target product carbon / carbon The included angles of the hot-pressing die in the axial direction are +21°, -21°, and they are laid layer by layer according to the angle change rule of +21°, -21°, and 60° and c...

Embodiment 3

[0048] This embodiment includes the following steps:

[0049] Step 1. According to the designed target product carbon / carbon hot pressing mold layup method, firstly arrange the continuous 96K pitch carbon fibers in advance along the thickness direction of the layup, that is, in the radial direction, and then lay down the 96K polypropylene along the hoop and longitudinal directions. Nitrile carbon fiber to obtain a bulk density of 0.50g / cm 3 3D structure prefab;

[0050] The included angle between the 96K pitch carbon fibers laid along the circumferential direction and the axial direction of the target product carbon / carbon hot pressing mold is 90°, and the 96K polyacrylonitrile carbon fibers laid along the longitudinal direction and the target product carbon / carbon hot pressing The included angles in the axial direction of the die are +38°, -38°, and are laid out layer by layer and cycled for 5 times according to the change law of the included angles of +38°, 90°, -38°, 90°, ...

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Abstract

The invention discloses a preparation method of a carbon / carbon hot-pressing mold for a high-pressure hot-pressing sintering furnace, which comprises the following steps of: 1, presetting continuous carbon fibers along the radial direction of a hot-pressing mold paving layer, and paving the carbon fibers along the circumferential direction and the longitudinal direction to obtain a three-dimensional structure prefabricated body; 2, high-temperature pretreatment; 3, performing chemical vapor deposition to obtain a hot-pressing die blank; 4, dipping-carbonizing to obtain a compact hot-pressing die blank; 5, processing to a final size; and 6, dipping-carbonizing to obtain the carbon / carbon hot-pressing mold. The continuous carbon fibers are introduced in the radial direction in advance, then the circumferential carbon fibers and the longitudinal carbon fibers are laid, the damage effect of the radial carbon fibers is avoided, the circumferential carbon fibers and the longitudinal carbon fibers are kept complete and continuous, the reinforcing effect is achieved, the overall structural strength is improved, the radial heat conductivity coefficient of the carbon / carbon hot-pressing die is increased, and the service life of the carbon / carbon hot-pressing die is prolonged. Therefore, the carbon / carbon hot-pressing die is stable in structure, excellent in mechanical property, uniform in thermal field, long in service life and suitable for a high-pressure hot-pressing furnace.

Description

technical field [0001] The invention belongs to the technical field of carbon / carbon material preparation, and in particular relates to a preparation method of a carbon / carbon hot pressing mould for high pressure and strong hot pressing sintering furnace. Background technique [0002] Hot-pressing sintering is a process of applying pressure in a high-strength mold cavity to a powder material that is difficult to sinter under vacuum or normal pressure (inert gas protection), while heating up and sintering. Due to the simultaneous heating and pressure, it is helpful for the contact and diffusion mass transfer of the powder particles, and the powder is sintered in a short time with a sintered body close to the theoretical density and a porosity close to zero to obtain a fine-grained structure product. The obtained material has good mechanical and electrical properties. [0003] In recent years, the size of the hot-pressing furnace in the powder metallurgy cemented carbide and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/532C04B35/622
CPCC04B35/83C04B35/532C04B35/622C04B2235/5248C04B2235/602C04B2235/422C04B2235/77C04B2235/95C04B2235/96C04B2235/656C04B2235/608Y02E50/30
Inventor 赵大明胡振英程皓侯卫权王春宇薛宁娟程凯峰张飞飞张稳姚成君艾涛刘文华
Owner XIAN CHAOMA SCI TECH
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