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Method for fabricating block body of nano pure nickel material

A nanometer and bulk technology, which is applied in the field of preparing bulk nanometer pure nickel materials, can solve the problems of restricting the practical application of new nanomaterials and low productivity, and achieve the effects of being conducive to industrial development, simple equipment and low comprehensive preparation cost.

Inactive Publication Date: 2010-02-10
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some problems and deficiencies in the use of these technologies, which have become a major obstacle to the practical application of new nanomaterials.
These problems include: (1) The serious problem involved in most preparation techniques is the extremely low productivity
Moreover, the study also showed that ball milling at liquid nitrogen temperature also leads to the in situ formation of nanoscale nitrogen oxides

Method used

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  • Method for fabricating block body of nano pure nickel material
  • Method for fabricating block body of nano pure nickel material
  • Method for fabricating block body of nano pure nickel material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Commercially available Ni powder is selected, the powder purity is 98.2% by weight, and the particle size is 53 microns. A vertical rotor ball mill and stainless steel balls and pots were selected, the ball-to-material ratio was 35:1, the ball milling temperature was -130°C, and Ni powder with an average grain size of 28nm was formed after ball milling for 7 hours. The bulk Ni material was obtained by cold isostatic pressing with a pressure of 1450MPa. The hot isostatic pressing temperature is 1050° C., the pressure is 200 MPa, and the holding time is 60 minutes. Finally, bulk nano-Ni rods were obtained by hydrostatic extrusion. The hydrostatic extrusion temperature is room temperature, and the extrusion ratio is 4:1. The hardness of the sample reaches 315DPH, which is nearly three times that of the coarse-grained material.

Embodiment 2

[0025] Commercially available Ni powder is selected, the powder purity is 98% by weight, and the particle size is 75 microns. A vertical rotor ball mill and stainless steel balls and pots were selected, the ball-to-material ratio was 40:1, the ball milling temperature was -140°C, and Ni powder with an average grain size of 11 nm was formed after ball milling for 9 hours. The bulk Ni material was obtained by cold isostatic pressing with a pressure of 1600MPa. The hot isostatic pressing temperature is 1100° C., the pressure is 150 MPa, and the holding time is 50 minutes. Finally, bulk nano-Ni rods were obtained by hydrostatic extrusion. The hydrostatic extrusion temperature is room temperature, and the extrusion ratio is 3:1. The sample hardness reaches 328DPH.

Embodiment 3

[0027] Commercially available Ni powder is selected, the powder purity is 98.5% by weight, and the particle size is 180 microns. A high-energy horizontal rotor ball mill and stainless steel balls and tanks were selected, the ball-to-material ratio was 50:1, the ball milling temperature was -150°C, and Ni powder with an average grain size of 32nm was formed after ball milling for 2 hours. The bulk Ni material was obtained by cold isostatic pressing at a pressure of 1400 MPa. The hot isostatic pressing temperature is 1000° C., the pressure is 250 MPa, and the holding time is 70 minutes. Finally, bulk nano-Ni rods were obtained by hydrostatic extrusion. The hydrostatic extrusion temperature is room temperature, and the extrusion ratio is 5:1. The sample hardness reaches 337DPH.

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Abstract

A process for preparing high-purity nano-nickel block includes providing high-purity micron-class Ni powder, low-temp ball grinding in liquefied nitrogen, and high-pressure treating at medium or low temp.

Description

technical field [0001] The invention belongs to the technical field of nanometer material preparation, and in particular provides a method for preparing bulk nanometer pure nickel material, which is widely used in the fields of micromechanics, electronics, nanotechnology and the like. Background technique [0002] Nanomaterials refer to single-phase or multi-phase polycrystalline materials with a grain size ranging from 1 to 100 nm in at least one direction. They differ from ordinary materials of the same composition only in the grain size and the arrangement of atoms at the grain boundaries. When the grain size of polycrystalline materials is reduced to the nanometer level, its structure will change significantly. First, short programs that are different from ordered (crystal structures) or disordered (liquid or glass structures) states are formed in the material. With the continuous reduction of crystal grains, the number of interfaces continues to increase, and the numb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/02B22F3/00B21C23/01B22F9/04
Inventor 杨滨樊建中张济山熊柏青程军胜田晓风郝斌崔华
Owner UNIV OF SCI & TECH BEIJING
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