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Method for preparing nickel-coated alumina powder

A technology of alumina powder and alumina powder, which is applied in coating and other directions, can solve the problem of not mentioning the preparation method of nickel-coated alumina powder, etc., and achieve the effects of uniform particles, low cost and simple preparation process

Inactive Publication Date: 2008-05-21
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation method of nickel-coated alumina powder is not mentioned in these patents

Method used

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Effect test

Embodiment 1

[0029] Add 0.3% Tween 80 to 10% nano-alumina suspension, place it in an ultrasonic wave to disperse for 20 minutes, and form a suspension A; Nickel salt solution is added in A, after stirring evenly, mixed solution B is formed, then slowly titrate 50% slightly excessive ammoniacal liquor in B, add the distilled water of 3 times of ammoniacal liquor after titration finishes, obtain dark blue nickel-ammonia complex ([ Ni(NH 3 ) 6 ] 2+ )-alumina mixed solution C, hydrothermally aged for 24hrs, filtered, washed, and dried to obtain a green intermediate coating product; then reduced and roasted at 1100°C with nitrogen-hydrogen mixed gas to obtain nickel-coated alumina with an average particle size of 70nm Powder.

Embodiment 2

[0031] Add 0.2% sodium hexametaphosphate and 0.1% Tween 80 to 20% nano-alumina suspension, place in ultrasonic wave and disperse for 20 minutes to form suspension A; Add the prepared 5% nickel salt solution to A, stir evenly to form a mixed solution B, then slowly titrate 50% slightly excess ammonia water in B, add 3 times the amount of ammonia water distilled water after the titration, and get dark blue Color nickel ammonia complex ([Ni(NH 3 ) 6 ] 2+ )-alumina mixed solution C, hydrothermally aged for 24hrs, filtered, washed, and dried to obtain a green intermediate coating product; then reduced and roasted with CO gas at 1280°C to obtain a black nickel-coated alumina powder with an average particle size of 90nm .

Embodiment 3

[0033] Add 0.1% Tuwen 80 to 10% nano-alumina suspension, place it in ultrasonic wave for 20 minutes to form suspension A; put 4% prepared 4% Nickel salt solution is added in A, after stirring evenly, mixed solution B is formed, then slowly titrate 50% slightly excessive ammoniacal liquor in B, add the distilled water of 3 times of ammoniacal liquor after titration finishes, obtain dark blue nickel-ammonia complex ([ Ni(NH 3 )6] 2+ )-alumina mixed solution C, hydrothermally aged for 24 hours, filtered, washed, and dried to obtain a green intermediate coating product; then reduced and roasted at 1100°C with nitrogen-hydrogen mixed gas to obtain blue nickel aluminate powder.

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Abstract

The invention relates to a preparation method of nickel-coated alumina oxide powder, in particular to the preparation method of nickel-coated aluminum oxide powder for thermal spraying in aviation, aerospace and military fields. The invention is characterized in that: a suspension is made from a mixing liquid of nano-aluminum oxide and dispersant, stirred and added with nickel salt solution at the same time, and the obtained mixture liquid is dropped with ammonium water after being fully stirred, added with distilled water, when dark blue mixing solution C of nickel ammonia complex ([Ni (NH3)) 2+and alumina oxide is obtained; the mixing solution C is aged by water, filtered, washed and dried, and a green middle coated product is obtained; the green middle coated product is further reduced and roasted, finally, black nickel-coated aluminum oxide powder is prepared. The nickel-coated aluminum oxide powder prepared through the invention has uniform granularity, with average size less than or equal to 1.0Mum, and can enhance the application performance of nano-alumina and expand the application of nano-aluminum oxide; the product is mainly used for aviation, aerospace and military materials and other high-tech fields. The method of the invention is simple, reproducible and easy to be industrialized.

Description

technical field [0001] The invention discloses a preparation method of nickel-coated alumina powder, and relates to a preparation method of nickel-coated alumina powder used for thermal spraying in the fields of aviation, spaceflight and military industry. Background technique [0002] In high-tech fields such as aviation, aerospace, and military materials, thermal spraying technology has become the most effective method for surface strengthening and surface modification of materials, which can make the surface of the substrate wear-resistant, corrosion-resistant, high-temperature oxidation-resistant, and electrically insulating. , heat insulation, radiation protection, anti-friction and sealing properties. At present, mature thermal spray coating materials include alumina, zirconia, titanium oxide, chromium oxide, boron nitride, metal and its composite materials, etc. where Al 2 o 3 Coatings have been widely used due to their low cost and a series of advantages such as h...

Claims

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Application Information

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IPC IPC(8): B22F1/02
Inventor 王锦王庆伟王建立
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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