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Equipment and method for preparing nanocrystal powder through vibration type copious cooling ball milling

A vibration-type, nano-crystalline technology, applied in the field of low-temperature ball milling, can solve the problems of low working temperature, reduce the dynamic recovery ability of powder deformation, etc., and achieve the effect of high thermal stability

Active Publication Date: 2017-05-10
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Cryogenic ball milling technology greatly reduces the dynamic recovery ability during powder deformation due to its lower working temperature

Method used

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  • Equipment and method for preparing nanocrystal powder through vibration type copious cooling ball milling
  • Equipment and method for preparing nanocrystal powder through vibration type copious cooling ball milling
  • Equipment and method for preparing nanocrystal powder through vibration type copious cooling ball milling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, commercial gas-atomized aluminum powder with a primary grain size of about 1-5 μm was ball-milled. Ball milling temperature -180°C, ball milling amplitude 5mm, vibration frequency 50Hz, ball milling time 2 hours, using stainless steel balls, mass ratio of ball to material 10:1, adding stearic acid amount to 2% of the mass of the abrasive, and preparing a thickness of 100-200nm The two-dimensional sheet-like nanocrystalline powder, the grain size is about 35nm.

Embodiment 2

[0038] In this example, commercial gas-atomized aluminum powder with a primary grain size of about 1-5 μm was ball-milled. Milling temperature -180°C, ball milling amplitude 6 mm, vibration frequency 50 Hz, ball milling time 4 hours, using stainless steel balls, ball-to-material mass ratio 10:1, after adjusting the size of the balls, it can produce concentrated particle size distribution, D50 in the range of 15-500 μm Precisely controlled equiaxed nanocrystalline powder, the grain size is about 50nm.

Embodiment 3

[0040] In this example, commercial gas-atomized aluminum powder with a primary grain size of about 1-5 μm was ball-milled. Milling temperature -180°C, ball milling amplitude 4mm, vibration frequency 50Hz, ball milling time 2 hours, using stainless steel balls, ball to material mass ratio 10:1, after adjusting the size of the balls can be prepared with concentrated particle size distribution, D50 in the range of 15 ~ 500μm Precisely controlled equiaxed ultrafine crystal powder body, the grain size is about 200nm.

[0041] Such as figure 2 Shown, adopt the SEM photo of the two-dimensional sheet-shaped powder prepared by ball milling of the present invention, as can be seen from figure (a) that the powder is on the micron scale in two dimensions; as can be seen from figure (b) that the two-dimensional sheet-formed powder The thickness is about 100-200nm.

[0042] Such as image 3 , Figure 4 As shown, the SEM photographs of nanocrystalline powders with D50=400 μm and D50=100...

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Abstract

The invention relates to the field of low-temperature ball milling, in particular to equipment and method for preparing nanocrystal powder through vibration type copious cooling ball milling. The equipment comprises a protective gas introduction pipeline, a liquid nitrogen introduction pipeline, a temperature feedback circuit, a pressure feedback circuit, a ball mill tank, a spring, an eccentric wheel, a spindle, a tank interior pressure and temperature control system, a driving motor, a liquid nitrogen and protective gas source and the like. The nanocrystal powder is prepared through the method combining the vibration type ball milling with liquid nitrogen refrigerating, according to the commercial aerosol powder, the raw material particle size is 5-50 microns, and the grain size is 0.5-5 microns. Different from existing planetary type or stirring type low-temperature ball milling equipment, vibrating squeezing and crushing as well as compacting are taken as the principal things of the ball milling principle of the equipment, the ball milling atmosphere can be controlled flexibly, and the nanocrystal powder which is controllable in particle size and appearance, intensive in particle size distribution and high in thermal stability is prepared in a short time by adjusting the ball milling parameters.

Description

[0001] Technical field: [0002] The invention relates to the field of low-temperature ball milling, in particular to a device for preparing nano-crystal powder by vibrating cryogenic ball milling with liquid nitrogen refrigeration, and a method for preparing nano-crystal powder by using the device. [0003] Background technique: [0004] Ball milling technology (mechanical alloying) refers to the metal or alloy powder concentrated in the ball mill through the long-term intense impact and collision between the powder particles and the grinding ball, so that the powder particles repeatedly produce cold welding and fracture, resulting in the atomic diffusion of the powder particles , so as to obtain a powder preparation technology of alloyed powder. [0005] Ball milling technology is also an important processing method for preparing non-equilibrium materials. Metal powders can be prepared by ball milling to produce supersaturated solid solutions, alloys and intermetallic compoun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
CPCB22F9/04B22F2009/043B22F2009/049
Inventor 熊天英冯博吴杰王吉强陈金生
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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