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Explosive compacting method capable of 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: 2009-10-14
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 of eliminating additional temperature affection
  • Explosive compacting method capable of eliminating additional temperature affection
  • Explosive compacting method capable of eliminating additional temperature affection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 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;

[0023] b. If figure 1 Shown: the mold 1 that powder compaction body 2 is housed is placed under the flyer 4 of the explosive device and is placed on the metal layer 3 pressed with copper powder or iron powder or cobalt powder etc. in advance, and the density of the metal layer 3 is this 40-65% of the metal crystal density, the height of the metal layer 3 can be set according to needs, preferably 1 / 10-1 / 4 of the powder layer thickness;

[0024] c. detonate the explosive column in the explosive device;

[0025] 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

[0027] 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;

[0028] b. If figure 2 As shown: the mold 1 with the powder compacted body 2 inside is placed under the flyer 4 in the explosive device and placed on the metal layer 3 such as copper powder, iron powder or cobalt powder, the density of the metal layer 3 is less than that of the metal crystal 40% of the density, that is, in a loose state, so a support plate 5 needs to be placed under the metal layer 3, and the support plate 5 can be any material, such as metal, plastic, wood or cardboard, etc. Plastic, wood or cardboard have light weight , cheap advantages;

[0029] c. detonate the explosive column in the explosive device;

[0030] 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

[0032] 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 image 3 As shown: a space of 1 / 10 to 1 / 4 of the height of powder compacted body 2 is reserved on the top of powder compacted body 2 in mold 1, and metal powder (copper powder, iron powder or cobalt powder) is placed on powder compacted body 2 In the space above, use less than 1.5KN / cm 3 The pressure is pressed to form a 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;

[0033] 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;

[0034] c. detonate the explosive column in the explosive device;

[0035] d. Recover the powder ash, and carry out post-processing on the powder ash, such as screen...

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Abstract

The invention discloses an explosive compaction method capable of eliminating the influence of additional temperature, which comprises the following steps: placing powder in a mold (1) to make a powder compact (2); placing the mold ( 1) Placed under the flyer (4) in the explosive device, there is a metal layer (3) connected to the bottom of the powder compact (2), and the density of the metal layer (3) is less than or equal to 65% of the crystallization density of the metal. %; detonate the explosive column in the explosive device; recover the powder ash, and post-process the powder ash. The set metal layer can make the strength of the reflected shock wave equal to or slightly greater than the incident shot wave, just like the existing momentum deriving plate, and at the same time, it can also dissipate the gas thin layer produced by the powder gap in the metal layer, without generating Severe gas adiabatic compression, so that no additional temperature is generated, which can eliminate the influence of additional temperature on the powder phase transformation conversion rate, and improve the product conversion rate.

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 Patents(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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