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Explosive compacting method capable eliminating additional temperature affection

A technology of compaction and density, which is applied in the field of explosive compaction, can solve the problems of reducing the powder phase transformation conversion rate, increasing the powder additional temperature, and less phase change, so as to improve the product conversion rate and eliminate the effect of influence

Inactive Publication Date: 2008-03-26
大连凯峰超硬材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually in the explosive synthesis process, the distance reached by the shock wave is slightly greater than the thickness of the powder layer, so that the gas thin layer will be adiabatically compressed under the action of the shock wave, thereby seriously increasing the additional temperature of the powder, and the excessive additional temperature of the powder The actual temperature deviates from the temperature calculated by Debye theory, resulting in less phase change in the powder layer in contact with the metal plate, which reduces the conversion rate of powder phase transition

Method used

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  • Explosive compacting method capable eliminating additional temperature affection
  • Explosive compacting method capable eliminating additional temperature affection

Examples

Experimental program
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Effect test

Embodiment 1

[0021] a. Same as the prior art, powders such as graphite powder, graphite and metal mixed powder, graphite and metal, resin mixed powder are placed in mold 1 to make powder compacted body 2;

[0022] b. As shown in Figure 1: place the mold 1 with the powder compacted body 2 inside under the flyer 4 of the explosive device and place it on the metal layer 3 pressed in advance with copper powder or iron powder or cobalt powder, etc., the metal layer The density of 3 is 40-65% of the metal crystal density, and the height of the metal layer can be set according to the needs, preferably 1 / 10-1 / 4 of the thickness of the powder layer;

[0023] c. detonate the explosive column in the explosive device;

[0024] d. Recover the powder ash, and carry out post-processing on the powder ash, such as screening, washing, and eliminating residual non-phase-change powder, to obtain the desired product.

Embodiment 2

[0026] a. Same as the prior art, powders such as graphite powder, graphite and metal mixed powder, graphite and metal, resin mixed powder are placed in mold 1 to make powder compacted body 2;

[0027] b. as shown in Figure 2: the mold 1 that powder compactor 2 is housed is placed below the flyer 4 in the explosive device and placed on metal layers 3 such as copper powder or iron powder or cobalt powder, the metal layer 3 The density is less than 40% of the metal crystal density, that is, it is in a loose state. Therefore, a support plate 5 needs to be placed under the metal layer 3. The support plate 5 can be any material, such as metal, plastic, wood or cardboard, etc., plastic, wood Or cardboard has the advantages of light weight and low price;

[0028] c. detonate the explosive column in the explosive device;

[0029] d. Recover the powder ash, and carry out post-processing on the powder ash, such as screening, washing, and eliminating residual non-phase-change powder, to ...

Embodiment 3

[0031] a. Same as the prior art, powders such as graphite powder, graphite and metal mixed powder, graphite and metal, resin mixed powder are placed in the mold 1 to make a powder compacted body 2, and then as shown in Figure 3: in the mold 1 The space above the inner powder compacted body 2 is 1 / 10 to 1 / 4 of the height of the powder compacted body 2, and the metal powder (copper powder, iron powder or cobalt powder) is placed in the space above the powder compacted body 2. Less than 1.5KN / cm 3 The pressure of pressing forms the metal layer 3 placed in the mold 1, and the density of the metal layer 3 is 40% to 65% of the metal crystal density;

[0032] b. Overturn the mold 1 with the powder compacted body 2 and the metal layer 3 inside by 180 degrees, and place it under the flying piece 4 in the explosive device;

[0033] c. detonate the explosive column in the explosive device;

[0034] d. Recover the powder ash, and carry out post-processing on the powder ash, such as scre...

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Abstract

The present invention relates to an explosive compacting method capable of eliminating influence of additional temperature. Said method includes the following steps: placing powder into a mould to prepare powder compacting body; placing said mould in which the powder compacting body is held under the flying sheet in explosion device, making the undersurface of said powder compacting body be connected with a metal layer, the density of said metal layer is 0-65% of said metal crystal density, under the metal layer whose described density is less than 40% of said metal crystal density a supporting plate is set; igniting explosive column in said explosion device, recovering powder ash and making the powder ash undergo the process of after-treatment.

Description

Technical field: [0001] The invention relates to an explosive compaction method, in particular to an explosive compaction method capable of eliminating the influence of additional temperature. Background technique: [0002] Explosive sintering or explosive synthesis, also known as explosive compaction, is a general term for the technology of using explosive energy to sinter powder materials into a block or synthesize another material. For example, explosive nano-polycrystalline diamond is the explosive synthesis technology. It is to use the explosion energy to change the graphite phase into nano-polycrystalline diamond. [0003] The existing explosive compaction method is to load powder (such as graphite powder, graphite and metal mixed powder, graphite and metal, resin mixed powder, etc.) 10-25% porous powder body; after that, place the mold containing the powder body on the metal plate (momentum export plate) and place it under the flyer of the explosive device, and keep ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/08
Inventor 张凯
Owner 大连凯峰超硬材料有限公司
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