Composite silver powder, preparation method thereof, and conductive silver slurry containing composite silver powder
A technology of conductive silver paste and silver powder, applied in the field of solar cells, can solve the problems of difficult dispersion of silver powder, complicated preparation process, low conductivity of conductive silver paste, etc., and achieve the effects of preventing agglomeration, simple process and high conductivity
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[0018] The invention provides the preparation method of described composite silver powder, comprises the following steps:
[0019] 1) preparing a solution containing silver nitrate, which also contains metal nitrates corresponding to metal oxides in the vitreous body and acids corresponding to non-metallic oxides in the vitreous body;
[0020] 2) The solution in step 1) is sprayed by air pressure and sintered at 800-1200° C. to obtain the composite silver powder.
[0021] According to the preparation method provided by the present invention, by first preparing a mixed solution of silver ions and the corresponding ions of inorganic oxides in the glass body, the silver ions and various inorganic ions in the glass body are uniformly mixed first, and then sintered at a high temperature in a spray state; sintering During the process, the ions in the solution first generate corresponding oxides, and various oxides are uniformly dispersed; the temperature continues to rise, and other...
Embodiment 1
[0032] This example is used to illustrate the composite silver powder provided by the present invention and its preparation method.
[0033] (1) Preparation of solution at normal temperature: take 120g of silver nitrate, add deionized water to make 0.7mol / L silver nitrate solution, continue to add 1.4g Zn(NO 3 ) 2 , 5g Bi(NO 3 ) 3 , 0.12g Ba(NO 3 ) 2 and 0.28g Al(NO 3 ) 3 , and mix well.
[0034](2) Transfer the solution prepared in step (1) into the spray generator, adjust the size of the nozzle so that the solution flow rate is 20ml / min, and the nitrogen carrying capacity is 10L / min; the outlet of the nozzle is connected to the quartz tube, and the resistance heating makes the temperature in the quartz tube After the spraying is completed, continue sintering for 30 seconds, and cool to obtain the composite silver powder of this example, denoted as A1, wherein the mass ratio of silver particles to glass body is 95:5.
Embodiment 2
[0036] Adopt the step identical with embodiment 1 to prepare composite silver powder, difference is:
[0037] In step (1), add 1.33g Zn(NO 3 ) 2 , 6.78g Bi(NO 3 ) 3 , 0.27g Ba(NO 3 ) 2 and 0.67gAl(NO 3 ) 3 .
[0038] Through the above-mentioned steps, the composite silver powder of this embodiment is obtained, denoted as A2, wherein the mass ratio of silver particles to glass body is 93:7.
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