A method for making anode blocks of tantalum capacitors by mixing and mixing powders in a thermal environment
A technology of tantalum capacitors and anode blocks, which is applied in the field of preparation of anode blocks of solid tantalum capacitors, can solve the problems of easily blocking the gaps of coarse powder particles and the like.
Active Publication Date: 2015-10-21
CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD
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Problems solved by technology
The background document patent GB2,465,451 A proposes a method of mixing coarse powder and fine powder, but because the fine powder particles are too small, it is easy to block the gaps between the coarse powder particles
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Embodiment 1
[0052] Two kinds of capacitor-grade sodium were used to reduce tantalum powder, the specific volumes were 50000 CV / g and 8000 CV / g respectively, and the heat treatment was carried out 3 times and 2 times respectively in an argon atmosphere at 850 °C, and the powder particles appeared to be clustered to a certain extent. The average Fischer particle size of the formed particles was 2 to 4.0 μm and 2.5 to 4.5 μm. Weigh 2.2kg of tantalum powder, wherein the weight ratio of coarse powder is 35%, and that of fine powder is 65%. Pour the crude fraction into an egg-shaped pan at 50°C to 100°C and stir well, and add an ethanol solution of glyceryl stearate with a concentration of 0.3% to 8% by weight while stirring. After mixing evenly, sprinkle fine powder and stir continuously, and then air-dry in a dry and ventilated environment at 30°C for 3 hours. Pressed and formed by a longitudinal forming machine, the pressed density is 5.95g / cm 3 , pre-fired in a vacuum environment of 400°C...
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Abstract
The invention relates to a method for manufacturing a tantalum capacitor anode block through mixed powder in a thermal field environment and belongs to the technical field of electronic components. The method sequentially comprises the steps of (1) conducting heat treatment on tantalum powder with different mean grain sizes in an inert gas environment at the temperature of 700 DEG C-1400 DEG C for 10min-1h to form clusters; (2) evenly mixing the rough powder cluster binding agent; (3) scattering fine powder clusters on the surfaces of rough powder clusters and evenly mixing; (4) conducting thermal field heating on mixed clusters in the step (3), removing solvent in the binding agent; (5) tiling mixed powder in the step (4) on an opening evaporator boat for drying with a blower; and (6) completing later working procedures according to the existing process. Contraction rate of a compression molded tantalum core after firing is obviously improved, no particle is crushed or blocks a gap, electrostatic capacity of a manufactured capacitor is greatly improved, and leakage current and loss are substantially reduced.
Description
technical field [0001] The invention relates to a method for preparing a solid tantalum capacitor anode block, in particular to a method for batching tantalum powder used to make the anode block in a hot zone environment. technical background [0002] Electrolytic capacitors are widely used in defense and other industrial fields as well as consumer products due to their small size, low power consumption and high precision. Because of the characteristics of high reliability, high stability and high volume efficiency, tantalum capacitors are not only widely used in high-precision electronic equipment in aerospace, aviation, weapons, ships and other fields, but also widely favored in many fields. [0003] Tantalum capacitors make a very important contribution to the miniaturization of electronic components and the high reliability of circuit systems under harsh environmental conditions. However, with the development of system miniaturization, higher requirements are placed on ...
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IPC IPC(8): H01G9/052H01G9/00
Inventor 田东斌韩杰方鸣杜敏张选红
Owner CHINA ZHENHUA GRP XINYUN ELECTRONICS COMP ANDDEV CO LTD