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A preparation method of a special mold for a microwave hot-pressing furnace

A technology of hot pressing furnace and mold, which is applied in the field of mold manufacturing to achieve the effects of uniform sintered structure, strong wave absorption and good compressive strength

Active Publication Date: 2020-08-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report on the preparation of graphite-silicon carbide hot pressing molds for microwave hot pressing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation method of the special mold for the microwave hot pressing furnace comprises the steps of:

[0017] Step 1. Mix the following mass percentage components: 65% flaky graphite, 25% silicon carbide, 3% aluminum oxide, 5% aluminum nitride and 2% paraffin wetting adhesive at a stirring speed of 400r / min for 6h to obtain Evenly mixed powder; the particle size of flake graphite is 200 mesh, the particle size of silicon carbide is 500 mesh, the particle size of alumina is 600 mesh, and the particle size of aluminum nitride is 325 mesh;

[0018] Step 2, molding the powder obtained in step 1 under cold pressing at 30 MPa for 2 hours to obtain a cold pressing green body;

[0019] Step 3. Sinter the cold-pressed green body obtained in step 2 at a temperature of 1950° C. for 5 hours, and take it out after natural cooling to obtain a graphite-silicon carbide mold semi-finished product;

[0020] Step 4. Polishing the graphite-silicon carbide mold semi-finished product o...

Embodiment 2

[0023] The preparation method of the special mold for the microwave hot pressing furnace comprises the steps of:

[0024] Step 1. Mix the following mass percentage components: 35% flaky graphite, 35% silicon carbide, 8% aluminum oxide, 12% aluminum nitride and 10% paraffin wetting adhesive with a stirring speed of 550r / min for 10h to obtain Evenly mixed powder; the particle size of flake graphite is 325 mesh, the particle size of silicon carbide is 325 mesh, the particle size of alumina is 400 mesh, and the particle size of aluminum nitride is 600 mesh;

[0025] Step 2, molding the powder obtained in step 1 under cold pressing at 20 MPa for 3 hours to obtain a cold pressing green body;

[0026] Step 3. Sinter the cold-pressed green body obtained in step 2 at a temperature of 1800° C. for 3 hours, and take it out after natural cooling to obtain a graphite-silicon carbide mold semi-finished product;

[0027] Step 4. Polishing the graphite-silicon carbide mold semi-finished prod...

Embodiment 3

[0030] The preparation method of the special mold for the microwave hot pressing furnace comprises the steps of:

[0031] Step 1. Mix the following mass percentage components: 50% flaky graphite, 30% silicon carbide, 6% aluminum oxide, 8% aluminum nitride and 6% paraffin wetting adhesive at a stirring speed of 500r / min for 8h to obtain Uniformly mixed powder; the particle size of flake graphite is 300 mesh, the particle size of silicon carbide is 360 mesh, the particle size of alumina is 500 mesh, and the particle size of aluminum nitride is 500 mesh;

[0032] Step 2, molding the powder obtained in step 1 under cold pressing at 40 MPa for 1 hour to obtain a cold pressing green body;

[0033] Step 3. Sinter the cold-pressed green body obtained in step 2 at a temperature of 2200° C. for 4 hours, and take it out after natural cooling to obtain a graphite-silicon carbide mold semi-finished product;

[0034] Step 4. Polishing the graphite-silicon carbide mold semi-finished product...

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Abstract

The invention relates to a preparation method of a special mold for a microwave hot pressing furnace, and belongs to the technical field of mold manufacturing. The preparation method of the special mold for the microwave hot pressing furnace comprises the following steps that components of, by mass, 35%-65% of flaky graphite, 25%-35% of silicon carbide, 3%-8% of aluminum oxide, 5%-12% of aluminumnitride and 2%-10% of a paraffin wetting adhesive are mixed at the stirring speed of 400-550 r / min for 6-10 hours, and uniformly mixed powder is obtained; the obtained powder is molded under the coldpressure of 20-40 MPa for 1-3 hours, and a cold-pressed green body is obtained; the obtained cold-pressed green body is sintered at the temperature of 1800-2200 DEG C for 3-5 hours, the green body istaken out after being naturally cooled, and a graphite-silicon carbide semi-finished mold is obtained; and the obtained graphite-silicon carbide semi-finished mold is polished, so that the special mold for the microwave hot pressing furnace is obtained. The hot pressing mold prepared through the method is high in absorbing property and good in compressive strength, and the process requirements ofmicrowave hot pressing sintering for wave absorbing ability and compressive strength are met.

Description

technical field [0001] The invention relates to a method for preparing a special mold for a microwave hot-press furnace, belonging to the technical field of mold manufacturing. Background technique [0002] Hot pressing sintering is widely used in the field of powder metallurgy to prepare functional structural parts such as high-performance ceramics and alloys. Since the hot pressing sintering process requires the material to be sintered at high temperature while applying a large pressure, high-purity graphite with high compressive strength and good electrical conductivity is usually used as the hot-pressing mold. Graphite is a national strategic resource, and its use cost is high. As a clean and efficient heating method, microwave has a series of advantages such as selective overall heating and energy in-situ conversion, and has quickly attracted the attention of the industry in the field of powder metallurgy. The new microwave sintering technology formed can significantly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/14
Inventor 杨黎胡龙涛侯明郭胜惠彭金辉胡途叶小磊
Owner KUNMING UNIV OF SCI & TECH