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A kind of piezochromic powder material and preparation method thereof

A technology of piezochromism and powder materials, applied in the direction of color-changing fluorescent materials, chemical instruments and methods, etc., can solve the problems of low pressure sensitivity, short service life, poor anti-aging performance, etc., and achieve low pressure sensitivity and long service life Short, poor anti-aging effect

Inactive Publication Date: 2011-11-30
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the disadvantages of low temperature resistance, poor anti-aging performance, short service life and low pressure sensitivity in the prior art, the present invention provides a piezochromic powder material, whose temperature resistance can reach 350 degrees Celsius, and its aging resistance is better than the above-mentioned Organic polymer materials, and continuous discoloration can be achieved under lower pressure stress (0.01-0.1GPa), and the piezochromic sensitivity is several times to dozens of times higher than the above organic materials

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  • A kind of piezochromic powder material and preparation method thereof
  • A kind of piezochromic powder material and preparation method thereof
  • A kind of piezochromic powder material and preparation method thereof

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preparation example Construction

[0023] The invention also provides a preparation method of the material, including two technological processes of a dry method and a wet method.

[0024] The dry process includes the following steps: using at least one of the hydroxide and oxide of element A as raw material A, and at least one of the hydroxide and oxide of element B as raw material B, raw material A and raw material B The particle size is below 100nm. mixing raw material A with a mole fraction equivalent to element A of x and raw material B with a mole fraction equivalent to element B equal to y, and then grinding the mixture so that the particle size of the mixture reaches 1-50 nm; then heating to 100-450 degrees Celsius and keeping it warm for a certain period of time, If (A m B 1-m ) 2 o n For the solid solution, the mass percentage of which is 0.1%-90% in the mixture, the heat preservation process is completed and cooled to room temperature; the resulting mixture powder material is sealed and packaged,...

preparation Embodiment 1

[0028] The preparation content is about 65% (Sn 0.0625 In 0.9375 ) 2 o 3 And 30% indium hydroxide, indium oxide, tin oxide, tin hydroxide, a mixture of about 5% by mass in total, is used for piezochromic powder.

[0029] The specific method is:

[0030] 1. Using the solid containing indium hydroxide and tin hydroxide as a raw material, the above-mentioned compound is fully mixed according to the mole fraction m=0.0625 of tin and indium to obtain a mixture;

[0031] 2. Grind this mixture and allow it to mix further. It can be mixed with pure water and wet milled;

[0032] 3. After grinding, heat the above mixture. The heating conditions are as follows: the furnace temperature is raised from room temperature to 150±50°C and kept warm;

[0033] 4. According to the crystal phase detection results, if there is formation (Sn 0.0625 In 0.9375 ) 2 o 3 , its formation content is greater than 60%, and the rest is indium hydroxide and indium oxide. After the heat preservation p...

preparation Embodiment 2

[0039] Preparation content about 50% (Sn 0.5 In 0.5 ) 2 o 3 And 40% indium hydroxide, indium oxide, tin oxide, tin hydroxide, a mixture of a total of about 10% by mass is used for piezochromic powder.

[0040] The specific method is:

[0041] 1. Using indium nitrate and tin hydroxide as raw materials, fully mix the above-mentioned compound with a purity of more than 95% according to the mole fraction m=0.5 of indium and tin, prepare an aqueous solution, and stir to obtain a mixture gel;

[0042] 2. For gel filtration, drying, and heating of the above mixture, the heating conditions are: the furnace temperature is raised from room temperature to 200±50°C, and kept warm;

[0043] 4. According to the crystal phase detection results, if any (Sn 0.5 In 0.5 ) 2 o 3 Formation, the content of which is greater than 50%, and the remaining less than 50% is indium hydroxide, indium oxide, tin oxide and tin hydroxide. After the heat preservation process is completed, it is cooled t...

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Abstract

The invention discloses a piezochromic powder material and a preparation method thereof, at least comprising (AmB1-m)2On solid solution oxide and hydroxide of element B formed by doping ions of element A in solid solution oxide of element B ; Wherein, the mass percentage of the solid solution oxide in the mixture is x, the mass percentage of the hydroxide of the B element is y; m is the mole fraction, 0.001<m<0.5, and n is a natural number. The temperature resistance of the invention can reach 350 degrees Celsius, the aging resistance is better than that of the prior art, continuous discoloration can be realized under low pressure stress (0.01-0.1 GPa), and the piezochromic sensitivity is several times to dozens of times higher than that of the prior art. The piezochromism of the present invention is reversible, and after being pressed into tablets and discolored, the original color can be restored after grinding for repeated use for the second time.

Description

technical field [0001] The present invention relates to a pressure-induced discoloration mixture material. Background technique [0002] The phenomenon that materials change color under pressure is called piezochromism. At present, there are several types of materials that can achieve piezochromism, one type is organoolefin compounds and amide polymers, the mechanism of discoloration lies in the isomerization of their molecular structure; the other type is metal halide organic compounds, such as platinum and palladium Such as organic compounds of precious metals, etc., the discoloration mechanism lies in its molecular isomerism, electron spin, metal ion valence state and crystal phase change, and the discoloration pressure stress is between 0.1-10GPa. These materials involve chemical changes and are generally irreversible. The United States has used pressure-sensitive dyes on important parts of aircraft to detect cracks that may appear under stress. In addition, the use of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K9/00
Inventor 苏力宏王一光艾艳玲王梁
Owner NORTHWESTERN POLYTECHNICAL UNIV
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