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Method for preparing Sn crystal whiskers

A whisker and rare earth element technology, applied in the field of new material preparation, can solve the problems of high whisker price, complicated preparation process and high equipment requirements

Inactive Publication Date: 2011-01-05
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

[0005] In order to overcome the technical defect of preparing whiskers by vapor phase growth (VLP mechanism), the invention provides a new process for preparing tin whiskers by solid phase decomposition, which solves the problem of high equipment requirements for producing whiskers in the prior art, The preparation process is complicated, and the price of whiskers remains high, etc.

Method used

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  • Method for preparing Sn crystal whiskers

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Effect test

Embodiment 1

[0021] Prepare Sn-Nd alloy with Sn75at%, the rest is Nd, choose the argon shielded tungsten arc melting method to melt and smelt the alloy with the above ratio, and obtain NdSn after cooling 3 Alloy ingots of intermetallic compounds. NdSn after smelting 3 It is a brittle intermetallic compound, which is broken into a powder state by mechanical means. The particle size of the powder is 50-100 microns, and it is placed in the room temperature atmosphere as a raw material to grow whiskers. The temperature fluctuation range of the room temperature environment is ( 20~25℃), the range of humidity fluctuation is (30~45%RH, relative humidity). After the sample was naturally placed in the above environment for 26 days, dense and slender Sn whiskers grew on the surface of the raw material matrix, such as figure 1 shown.

Embodiment 2

[0023] Prepare Sn75at%, the rest is the Sn-Ce alloy of Ce, the preparation method is the same as that of Example 1, and obtains CeSn 3 Alloy ingots of intermetallic compounds. The temperature fluctuation range of the room temperature environment is (15-20° C.), and the humidity fluctuation range is (20-40% RH, relative humidity). After the sample was placed in the atmosphere at room temperature for 30 days, a large number of elongated tin whiskers grew on the surface of the raw material matrix.

Embodiment 3

[0025] Prepare Sn75at%, the rest is the Sn-La alloy of La, and preparation method is the same as embodiment 1, obtains LaSn 3 Alloy ingots of intermetallic compounds. The temperature fluctuation range of the room temperature environment is (5-10° C.), and the humidity fluctuation range is (10-20% RH, relative humidity). After the sample was placed in the atmosphere at room temperature for 50 days, a large number of elongated tin whiskers grew on the surface of the raw material matrix.

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Abstract

The invention relates to the field of new materials, in particular to a novel metal crystal whisker material and a method for preparing metal tin (Sn) crystal whiskers, which solve the problems of high requirements on crystal whisker production equipment, complex crystal whisker preparation process, high price of the crystal whisker and the like. The method comprises the following steps of: smelting tin (Sn) and rear earth elements (neodymium (Nd), cerium (Ce) and lanthanum (La)) into an Sn-RE compound; smashing the Sn-RE compound into powder which is taken as a parent material for growing the Sn crystal whiskers; and after the Sn-RE compound powder is stored under the atmospheric conditions at the room temperature for a certain time, triggering the Sn crystal whiskers to spontaneously grow on the parent material by chemical reaction of automatic decomposition of the Sn-RE compound under the atmospheric conditions to obtain the Sn crystal whisker material. In the method, the growth process of the crystal whiskers is controlled by mainly controlling the growth time, namely the whisker growth condition can be suitable for natural environments of different places, and corresponding production equipment and temperature and moisture control conditions are not needed, so the production cost of the crystal whiskers can be effectively controlled.

Description

Technical field: [0001] The invention relates to the field of new material preparation, in particular, it provides a new metal whisker preparation material and method to manufacture metal Sn whisker materials. Background technique: [0002] Whiskers are thin fibrous materials grown in the form of single crystals under artificially controlled conditions. Because the lateral dimensions of whiskers are very small (generally only 1-10 microns) and exist in the form of single crystals, whiskers are considered to be a crystalline material with a perfect lattice structure. Because there are few crystal defects in the whiskers, material scientists believe that the whiskers themselves can theoretically achieve a high theoretical crystal strength. In the 1960s, Herring and Galt, material scientists at Bell Laboratories in the United States, successfully proved with the bending test of Sn whiskers that as long as there are no dislocation defects in the crystal, the theoretical strengt...

Claims

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Application Information

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IPC IPC(8): C30B29/02C30B29/62C30B1/00
Inventor 冼爱平刘萌
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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