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Preparation method of spherical superfine gold powder for electronic materials

An electronic material and spherical technology, which is applied in the field of preparation of spherical ultrafine gold powder for electronic materials, can solve the problems of morphology and structure characteristics, unsatisfactory tap density and particle size, etc.

Inactive Publication Date: 2015-01-21
SUZHOU HUACHONG PRECISION MACHINERY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, due to defects in preparation methods, ingredients, and process parameters, the domestically produced gold powder is not ideal in terms of morphology, structure, tap density, and particle size.

Method used

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  • Preparation method of spherical superfine gold powder for electronic materials

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Embodiment

[0019] The specific preparation method is as follows:

[0020] a) Prepare gold fulminate solution. The specific preparation process is: first put a certain amount of gold nuggets in a dissolving container, add a small amount of deionized water, heat slightly, then add appropriate amount of aqua regia several times to dissolve the gold nuggets, and wait for the gold nuggets to dissolve. After it is completely dissolved, add concentrated hydrochloric acid several times to catch the nitrate; when there is no brown smoke, add deionized water several times to catch the acid; when there is no pungent smell, concentrate the solution to a concentration of 30 g / L for later use. Then add ammonia water to the gold solution to adjust the pH value to weak alkaline, so as to fully form the gold fulminate solution; finally adjust the pH value of the gold fulminate solution to 3.5 with hydrochloric acid.

[0021] b) Prepare reducing agent solution and dispersant solution. The specific prepara...

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Abstract

The invention provides a preparation method of spherical superfine gold powder for electronic materials. The preparation method includes the following steps: a), preparing a fulminic acid gold solution, b), preparing a reductant solution and a dispersant solution, c), preparing the gold powder through a reduction reaction and d), washing and drying the gold powder. The preparation method is simple and reasonable, the spherical superfine gold powder prepared according to the method has the advantages of high dispersibility, centralized granularity, small specific surface area and high tap density, and conductor paste made of the superfine gold powder has excellent electric conductivity and sintering characteristic and compact sintered membrane layers.

Description

technical field [0001] The invention relates to an electronic material, in particular to a method for preparing spherical ultrafine gold powder for electronic materials, and belongs to the technical field of electronic materials. Background technique [0002] Electronic materials are the material basis for the development of modern electronics industry and science and technology. They mainly refer to materials used in electronic technology and microelectronic technology, including dielectric materials, semiconductor materials, piezoelectric and ferroelectric materials, conductive metals and their alloy materials. , magnetic materials, optoelectronic materials and other related materials. Electronic materials cover a wide range of materials whose main function is to be optically functional or affect the electrical properties of the product. At present, electronic materials are mainly used in industries such as IC manufacturing, flat panel displays, structures, printed circui...

Claims

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Application Information

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IPC IPC(8): B22F9/24
Inventor 付冲
Owner SUZHOU HUACHONG PRECISION MACHINERY