Forming method of annular voltage-sensitive resistor

A technology of piezoresistors and molding methods, which is applied in the fields of piezoresistors, resistors, and resistance manufacturing, etc., and can solve the problems of uneven density of green bodies, high requirements for powder quality, mold quality, and workers' operation skills. Prepare ring products and other problems to achieve the effect of eliminating anisotropy and pores, reducing quality defects, and fewer operators

Inactive Publication Date: 2005-06-08
广州新日电子有限公司
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AI Technical Summary

Problems solved by technology

Dry pressing is formed by pressing the spray granulated powder on a pressure forming machine. Single-head press or rotary press is mostly used. The defect is that the density of the green body after pressing is not uniform enough, which affects the quality of the powder and the quality of the mold. And workers have high requirements for operation technology, and it is easy to cause layering, edge drop, and mold sticking of the green body; in addition, the dry pressing molding has a

Method used

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Examples

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Embodiment Construction

[0013] The present invention will be described in further detail below in conjunction with examples.

[0014] In this example, SrTiO 3 Taking the ring blank as an example, its forming process includes the following steps in sequence:

[0015] (a) Mixing: SrTiO 3 The powder, the hydroxypropyl cellulose of 3.5~4wt% dry base, the glycerol of 3~5wt% dry base, the dispersant of 0~1wt% dry base and the distilled water of 20~23wt% dry base are placed in Z Mix evenly in a shaped shaft mixer, and the mixing time is not less than 3 hours.

[0016] (b) Rough rolling: discharge the uniformly mixed mud material to a three-roll rolling mill for the first rolling, the distance between the rollers is less than 0.4mm, and the rolling times are not less than 6 times.

[0017] (c) Freezing: Seal the mud material obtained by rough rolling and put it into the refrigerator for at least 40 hours at 0-10°C.

[0018] (d) Finish rolling: After refrigerating, carry out the second rolling on the thre...

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Abstract

The molding method of the ring varistor includes the following steps in sequence: (a) mixing: put the powder with binder and solvent in the kneader and mix evenly; (b) rough rolling: the above powder is mixed After training, the material is discharged to the rolling mill for the first rolling; (c) freezing: the mud obtained by rough rolling is sealed and refrigerated at 0-10°C; (d) finishing rolling: the mud obtained after refrigeration is subjected to the second rolling. Secondary rolling to make it uniform and compact; (e) Extrusion: place the finished mud in a vacuum extruder to extrude into a film belt with good uniformity, density and consistency; (f) drying; (g) stamping. The method can improve the uniformity and compactness of the green body and make the production efficiency higher.

Description

technical field [0001] The invention relates to a molding method of ceramics, in particular to a molding method of a ring piezoresistor. Background technique [0002] At present, the forming of ring varistors usually adopts two processes of dry pressing forming and rolling film forming. Dry pressing is formed by pressing the spray granulated powder on a pressure forming machine. Single-head press or rotary press is mostly used. The defect is that the density of the green body after pressing is not uniform enough, which affects the quality of the powder and the quality of the mold. And workers have high requirements for operation technology, and it is easy to cause layering, edge drop, and mold sticking of the green body; in addition, the dry pressing molding has a lot of dust pollution, and it needs to be equipped with expensive spray granulation equipment. Generally, it is difficult to prepare a thickness of Ring products below 0.5mm. The roll film forming process is to p...

Claims

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Application Information

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IPC IPC(8): H01C7/10H01C17/00
Inventor 庄严李红耘程莉
Owner 广州新日电子有限公司
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