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Preparation method and system for silver zinc oxide composite powder

A silver-zinc oxide and composite powder technology, which is applied in the field of preparation of silver-zinc oxide composite powder, can solve problems such as uneven surface and internal structure of finished materials, difficult control of powder quality stability, and inaccurate contact size, etc., to achieve product Phase control, large-scale mass production, and scientific and reasonable process design

Inactive Publication Date: 2018-08-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the main methods for preparing silver-zinc oxide electrical contact materials include alloy internal oxidation method, co-precipitation method and powder metallurgy method, among which, alloy internal oxidation method is a relatively advanced process for preparing electrical contact materials. This method has simple process, low cost and excellent contact performance, and is widely used at home and abroad. However, the surface and internal structure of the finished material prepared by this method are not uniform, and there is a poor oxide layer in the middle, which leads to inaccurate contact dimensions; Powder metallurgy method is one of the main preparation methods of silver metal oxide composite materials. Powder metallurgy method can obtain electrical contact materials with relatively uniform structure and stable performance, but the finished material has low density, poor processability, low resistivity Higher, poor interfacial wettability between oxide particles and the substrate, and weak interfacial bonding strength; the second phase of the silver-based contact material prepared by the co-precipitation method is dispersed and evenly distributed, and the electrical properties are good, but the powder manufacturing cost is high, and Due to the wet chemical reaction process involved, the stability of each batch of powder quality is difficult to control

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  • Preparation method and system for silver zinc oxide composite powder
  • Preparation method and system for silver zinc oxide composite powder
  • Preparation method and system for silver zinc oxide composite powder

Examples

Experimental program
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Effect test

Embodiment 1

[0064] The embodiment of the present invention prepares silver-zinc oxide composite powder according to the above-mentioned preparation method, and the specific process is as follows: the molar ratio of zinc oxide and silver in the silver-zinc oxide composite powder product is preset to be 1:10, and the concentration of silver ions in the precursor solution is set to be 0.1mol / L, weigh 16.99g of silver nitrate and 2.98g of zinc nitrate hexahydrate according to the amount of 1L precursor solution, add 500ml of deionized water, ultrasonic vibration for 15min to dissolve, and finally constant volume to obtain a clear and transparent precursor solution .

[0065] Subsequently, the temperature of the three constant temperature zones of the vertical resistance furnace was uniformly set to 600 °C, and the precursor solution was passed into the reaction furnace in the form of droplets through an ultrasonic atomization device. The compressed air flow rate was 15 L / min, and the droplet f...

Embodiment 2

[0068] The embodiment of the present invention prepares silver-zinc oxide composite powder according to the above-mentioned preparation method, the specific process is similar to that of Example 1, the difference is that when preparing the precursor solution, the concentration of silver ions in the precursor solution is controlled to be 0.2 mol / L, in addition, high temperature heating The temperature of the three constant temperature zones of the decomposed vertical resistance furnace is uniformly set to 1000°C, and the obtained silver-zinc oxide composite powder is collected by a cyclone classification device with a temperature of 200°C.

[0069] The results show that the prepared silver-zinc oxide composite powder is mainly Ag phase and ZnO phase, and the phases of the powder collected in the three receiving tanks are consistent; at the same time, the silver oxide collected in each receiving tank Scanning electron microscope analysis of the zinc composite powder shows that th...

Embodiment 3

[0071] The embodiment of the present invention prepares silver-zinc oxide composite powder according to the above-mentioned preparation method, the specific process is similar to that of Example 1, the difference is that when preparing the precursor solution, the molar ratio of zinc oxide and silver in the silver-zinc oxide composite powder product is preset. The ratio is 8:10. In addition, the temperature of the three constant temperature zones of the vertical resistance furnace for high-temperature pyrolysis is uniformly set to 900°C, and the obtained silver-zinc oxide composite powder is collected by a 200°C cyclone classifier.

[0072] The results show that the prepared silver-zinc oxide composite powder is mainly Ag phase and ZnO phase, and the phases of the powder collected in the three receiving tanks are consistent; at the same time, the silver oxide collected in each receiving tank Scanning electron microscope analysis of the zinc composite powder shows that the partic...

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Abstract

The invention discloses a preparation method and system for silver zinc oxide composite powder. The preparation method comprises the following steps of: separately weighing a silver raw material and azinc raw material in proportion, dissolving the raw materials to prepare a precursor solution containing silver nitrate and zinc nitrate, performing atomizing treatment on the precursor solution to obtain 0.01-100[mu]m precursor fog drops, and thermally decomposing the precursor fog drops at a temperature being 450-1150 DEG C to obtain the silver oxide composite powder. The system comprises an atomizing device, a thermal treatment device and a cyclone collecting device. According to the method disclosed by the invention, a proper amount of C1-C4 alcohols is added while the precursor solutionis prepared, and sphericity degree of the silver zinc oxide composite powder can be effectively controlled; a proper amount of ammonia water is added, so that the silver zinc oxide composite powder ofa hollow structure can be prepared; and the cyclone collecting device is utilized for effectively grading powder of different grain sizes, the process design is scientific, the process is continuous,the equipment structure is reasonable, raw materials are easily available and are cheap, phases of reaction products are controllable, purity is high, the grain sizes of the particles are controllable, large-scale mass production can be realized, and the application prospect is wide.

Description

technical field [0001] The invention relates to the technical field of preparation of functional powder materials, in particular to a method and system for preparing silver-zinc oxide composite powder. Background technique [0002] At present, the annual demand of silver and silver-based electrical contact materials in the world is about 2900-3000 tons, and the annual demand of my country alone is as high as 900-1000 tons. Silver cadmium oxide, known as "universal electrical contact material", has been gradually banned due to its environmental pollution; silver zinc oxide has become a new generation of environmentally friendly materials due to its excellent arc erosion resistance, wear resistance and fusion welding resistance electrical contact material. [0003] In the prior art, the main methods for preparing silver-zinc oxide electrical contact materials include alloy internal oxidation method, co-precipitation method and powder metallurgy method, among which, alloy inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 刘智勇刘志宏李启厚朱银马欢黄辉
Owner CENT SOUTH UNIV
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