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Self-spreading pre-heating powder aqueous medium bidirectional blasting and concreting device

A self-propagating, water-medium technology, applied in the field of preparing high-density hard-to-consolidate metal composite materials and their functional gradient materials, can solve the problems of long heating time, mold softening, short pulse duration, etc., to reduce strong reflection, good Flatness, the effect of improving the consolidation quality

Inactive Publication Date: 2008-03-12
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the corresponding heat insulation unit is required, and the installation of the explosive device is slightly complicated
The disadvantage of electric heating is that the heating time is long (in hours), it is easy to cause the mold to soften, and it will cause tungsten to integrate into the substrate to form too much solid solution
The peak pressure of plane wave collision layout is high, but the pulse duration is short, and the tensile wave generated after shock wave collision is not conducive to the improvement of the quality of sample explosion consolidation

Method used

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  • Self-spreading pre-heating powder aqueous medium bidirectional blasting and concreting device
  • Self-spreading pre-heating powder aqueous medium bidirectional blasting and concreting device
  • Self-spreading pre-heating powder aqueous medium bidirectional blasting and concreting device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] Example 1: Explosive consolidation of Mo / Cu FGM with a sample diameter of Φ30mm

[0033] Using the explosive consolidation device in Figure 1, the purity of Mo powder used in the test is greater than 99.9%, and the average particle size is 3 μm. The purity of Cu powder is greater than 99%, and the average particle size is 74 μm. The sample is divided into seven layers, the first layer is a pure Mo layer with a thickness of 3mm, the seventh layer is a pure Cu layer with a thickness of 2mm, and the transition layer is divided into five layers, each layer is 1mm, and the total thickness is 5mm. In this test, the component distribution index p=2 was used. Each layer is proportioned according to the design percentage, wet mixed for 8 hours, dried and ball milled for 2 hours, and then filled layer by layer into a Φ30mm steel pressure mold for compression molding. The diameter of the powder base is Φ30mm, and the calculated relative density is 58.82%.

[0034] Using (TiO 2...

example 2

[0036] Example 2: Explosive consolidation of W(Mo) / Cu FGM with a sample diameter of Φ30mm

[0037] Using the explosive consolidation device in Figure 1, the average particle size of W powder is 1 μm, 3 μm, 12 μm, and 20 μm, and the mixed powder is mixed according to the design grade. The particle size of molybdenum powder is 33 μm, the purity of Cu powder is greater than 99%, and the average particle size is 74 μm. The sample is divided into seven layers, the first layer is a W-Mo layer with a thickness of 3mm, the seventh layer is a pure Cu layer with a thickness of 2mm, and the gradient layer is divided into five layers, each layer is 1mm, and the total thickness is 5mm. In this test, the ingredient distribution index p=1.5 was used. Each layer is batched according to the design percentage, wet mixed for 8 hours, dried and ball milled for 2 hours, and then filled layer by layer into a Φ30mm steel pressing mold for compression molding. The diameter of the powder blank is Φ30m...

example 3

[0039] Example 3: Explosive consolidation of W(Mo) / Cu FGM with a sample diameter of Φ50mm

[0040] The explosive consolidation device shown in Figure 2 is used with the same self-propagating mixing system. Tungsten powders with different particle sizes were used in the test, namely 1 μm, 3 μm, 10 μm, 12 μm, and 20 μm. For coarser tungsten powder, the method of grading is used for batching. The alloy layer is mixed with 40% molybdenum by volume, 30% tantalum by volume, 1% lanthanum oxide by mass, or simultaneously doped with molybdenum, tantalum and lanthanum oxide. The particle size of the molybdenum powder is 3 μm, the particle size of the tantalum powder is 30 μm, the lanthanum oxide is analytically pure lanthanum oxide, and the copper powder is electrolytic copper powder with a particle size of ≤75 μm.

[0041] The gradient layer adopts different distribution exponent p values, which are 1.0, 1.2, 1.5, and 2, respectively. The explosively consolidated sample consists of ...

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Abstract

A two-way explosion concrete device of self-spread preheat powder aqueous medium is used for manufacturing a high-density hard concrete metal or ceramic compound materials and functionally gradient materials of the ceramic compound materials, which consists of a plane wave generator, a high grade energy main charge, a pressure work steel tube, a waterseal unit, a wave impedance match unit, an outer protection tub or a protective unit, a self-spread dust electrical heating unit and a protective unit of sample. The present invention is designed to provide the two-way explosion concrete device of self-spread preheat powder aqueous medium that can produce a high-energy explosive detonated by plane detonation wave produced by two plane wave generators with symmetry layout and two-way explosion by making use of aqueous medium to transfer a plane explosive shock wave and self-spread high temperature synthetic reaction preheat powder.

Description

technical field [0001] The invention relates to a two-way explosive solidification of difficult-to-consolidate (such as W, Mo, Ti and ceramics, etc.) The junction method is suitable for the process technology of preparing high-density hard-to-consolidate metal (or ceramic) composite materials and their functionally graded materials (FGM). Background technique [0002] Because W, Mo, Ti and other refractory metals and ceramic materials are restricted by the nature of the material itself, the room temperature explosive consolidation process often cannot achieve the surface temperature rise required for powder particle bonding, so it is difficult to meet the requirements for the preparation of high-quality refractory metals. Or the need for ceramic composites. Therefore, preheating powder explosive consolidation technology has become the leading direction of research in recent years, and heating technologies such as electric heating and self-propagating high-temperature synthe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/08
Inventor 陈鹏万蒋志明杨军
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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