A polymer positive temperature coefficient heat-sensitive ceramic material and its preparation method

Abstract

The invention discloses a polymer positive-temperature-coefficient thermal sensitive ceramic material and a preparation method thereof. Through addition of PbTiO3 and through adopting thermosetting polymer resin as a raw material, the Curie temperature point of the prepared ceramic material is obviously increased. The raw materials and process conditions adopted by the invention are easy to realize; the repeatability of the material performance is good, the performance is excellent, the application range is wide, the Curie point of a measured sample of the prepared polymer positive-temperature-coefficient thermal sensitive ceramic material is 212.5-230 DEG C, and the technical problems of high room temperature resistivity and low Curie point of a ceramic material in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of ceramic material preparation, in particular to a polymer positive temperature coefficient heat-sensitive ceramic material and a preparation method thereof. Background technique [0002] PTC ceramic is a semiconducting electronic ceramic material with a positive temperature coefficient. The intelligent electronic ceramic component with this characteristic integrates heating and temperature control, and has automatic temperature control, safety and energy saving, automatic recovery, non-contact action, No open flame, long life and so on. [0003] The patent document (CN201510167870.2) discloses a high Curie temperature PTC thermosensitive ceramic material, the ceramic material has a high room temperature resistivity and a low Curie point. At the same time, in the preparation process of the ceramic material, silver paste is coated on both sides of the ceramic after the firing is completed. The surface flatn...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of macromolecule positive temperature coefficient thermosensitive ceramic material and preparation method thereof, solve following technical problem: (1) by adding PbTiO 3 At the same time, thermosetting polymer resin is used as raw material to make the Curie temperature point of the prepared ceramic material significantly improved. The present invention achieves the low room temperature resistance of the polymer positive temperature coefficient thermosensitive ceramic material by adding Cr, Ni and the preparation process High efficiency and excellent PTC effect, low room temperature resistivity, the raw materials and process conditions used in the present invention are easy to realize, the repeatability of material properties is good, the performance is excellent, and the application range is wide. Its Curie point is 212.5-230 ℃, which solves the technical problem of high room temperature resistivity and low Curie point of ceramic materials in the prior art; (2) shrinkage of the piston rods of the two movable cylinders on the mounting plate, and then Drive the right-angle clamping plate to clamp the ceramic sheet on the support plate. After clamping, the piston rod of the first cylinder pushes the push frame upward. The push frame drives the mounting plate up through the connecting plate, and then the ceramic sheet moves upward to the bottom of the slurry chamber. The piston rod of the second cylinder on the right-angle frame shrinks, and the piston rod of the second cylinder drives the top fixed plate to descend through the push block, and the top fixed plate drives the slurry chamber to descend, and the coating roller at the bottom of the slurry chamber contacts the upper surface of the ceramic sheet. The design of the two movable cylinders combined with the partition plate will not affect the coating on the front and back sides of the ceramic sheet while satisfying the clamping of the ceramic sheet, and the movement of the two movable cylinders in the same direction drives the ceramic sheet to move repeatedly, which solves the current problem. In the technology, there is a technical problem that the ceramic sheet is coated with silver paste, and the surface coating flatness is not high, so that the electrical conductivity of the ceramic material is not high; (3) after the slurry coating on the upper surface of the ceramic sheet is completed, the second cylinder passes the slurry The cavity drives the coating roller to move up, the first cylinder drives the ceramic sheet to move down, then the first turning cylinder drives the ceramic sheet to rotate 180°, and the lower surface of the ceramic sheet faces upward, the first cylinder drives the ceramic sheet to move up, and the second cylinder passes through the slurry The material chamber drives the coating roller to move down, and then the coating roller touches the uncoated surface of the ceramic sheet, and the coating roller evenly coats the slurry on the uncoated surface of the ceramic sheet. The coating roller will not block the turning of the ceramic sheet, and only one coating roller is needed to complete the double-sided coating of the ceramic sheet, which solves the technical problem that the existing coating equipment is difficult to coat the ceramic sheet on both sides in the prior art

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