一种用于放电等离子体烧结金刚石铜复合材料的石墨模具

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By designing detachable graphite mold components and using spark plasma sintering technology, the problem of high processing difficulty of diamond-copper composite materials was solved, enabling efficient fabrication of heat dissipation fins, reducing costs and improving heat dissipation performance.

CN224508459UActive Publication Date: 2026-07-17ZHONGYUAN CRITICAL METAL LAB

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: ZHONGYUAN CRITICAL METAL LAB
Filing Date: 2025-08-15
Publication Date: 2026-07-17

AI Technical Summary

Technical Problem

Diamond-copper composite materials present challenges in processing finished products due to their high hardness and complex structure, leading to processing difficulties and high costs, especially when preparing heat dissipation fins.

Method used

A graphite mold was designed, including components such as a lower pressure head, a lower pressure column, an outer sleeve, an upper pressure column, an upper pressure head, and an inner sleeve. The inner sleeve has a detachable structure, and heat dissipation fins with a specific structure are prepared by discharge plasma sintering, which reduces the demolding difficulty and extends the mold life.

Benefits of technology

It simplifies operation, reduces processing costs, improves the heat dissipation performance of the heat sink fins, and extends the service life of the graphite mold.

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Abstract

本实用新型涉及石墨模具技术领域，公开了一种用于放电等离子体烧结金刚石铜复合材料的石墨模具，石墨模具由下至上依次为下压头、下压柱、外套筒、上压柱、上压头；所述外套筒内设置有内套筒，内套筒的上方设置有上盖体；下压柱、上压柱、内套筒、上盖体的外径均与外套筒的内径相匹配；内套筒与上盖体之间形成成型空腔；所述成型空腔包括基板部，基板部的下方由左至右排列有若干翅片部。本实用新型的石墨模具可用于制备具有散热翅片结构的金刚石铜复合材料；本实用新型的内套筒采取可组装拆分的结构，降低了脱模的难度，还降低了模具更换的成本。

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Claims

1. A graphite mold for sintering a diamond-copper composite material by an electric discharge plasma, the graphite mold comprising, from bottom to top, a lower pressing head, a lower pressing column, an outer sleeve, an upper pressing column, and an upper pressing head; characterized in that: An inner sleeve is provided inside the outer sleeve, and an upper cover is provided above the inner sleeve; The outer diameters of the lower pressure column, upper pressure column, inner sleeve, and upper cover are all matched with the inner diameter of the outer sleeve; The upper end of the lower pressure column extends into the lower part of the outer sleeve, and the lower end of the upper pressure column extends into the upper part of the outer sleeve. The inner sleeve and the upper cover are stacked between the lower pressure column and the upper pressure column from bottom to top. A molded cavity is formed between the inner sleeve and the upper cover; the molded cavity includes a base plate portion, and several fin portions are arranged from left to right below the base plate portion.

2. The graphite die for spark plasma sintering of diamond-copper composite material according to claim 1, characterized in that: The upper and lower pressure heads are frustum-shaped. The diameter of the lower end face of the upper pressure head is larger than the diameter of its upper end face, and the diameter of the upper end face of the lower pressure head is smaller than the diameter of its lower end face. The lower end face of the upper pressure head is provided with a groove A that matches the upper pressure column, and the upper end face of the lower pressure head is provided with a groove B that matches the lower pressure column. The upper end of the upper pressure column and the lower end of the lower pressure column extend into groove A and groove B, respectively.

3. The graphite die for spark plasma sintering of diamond-copper composite material according to claim 1, characterized in that: The inner sleeve includes a base, an insert plate, and bow-shaped columns; there are four bow-shaped columns, which are placed around the outer sleeve. The outer sidewalls of the four bow-shaped columns match the inner sidewalls of the outer sleeve, and the inner sidewalls of the four bow-shaped columns form a rectangular placement cavity; a base is matched to the bottom of the placement cavity; several slots are provided on the base from left to right. The insert plate is a one-piece structure, including an upper plate body and an insert block at the bottom of the plate body; the insert block matches the slot, and the front-to-back length of the plate body matches the front-to-back length of the placement cavity; several insert plates are inserted into the slots of the base from left to right.

4. The graphite mold for spark plasma sintering of diamond-copper composite material according to claim 1, characterized in that: The outer diameter of the outer sleeve is 80-110mm.

5. The graphite mold for spark plasma sintering of diamond-copper composite material according to claim 1, characterized in that: The outer diameter of the inner sleeve and the upper cover is 30-60mm.

6. The graphite mold for spark plasma sintering of diamond-copper composite material according to claim 1, characterized in that: The outer diameter of the upper pressure column is 30-60mm and the height is 30-50mm; the outer diameter of the lower pressure column is 30-60mm and the height is 30-50mm.