Preparing method of negative low aging rate negative temperature coefficient thermistor ceramic material

• Main Authors: ZHU SHAOFENG, LI DONGCAI, QIAN NIYAN, LIU BINGCHEN, SHI QING
• Format: Patent
• Language: Chinese; English
• Published: 17.07.2018
• Subjects: ARTIFICIAL STONE; BASIC ELECTRIC ELEMENTS; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; ELECTRICITY; LIME, MAGNESIA; METALLURGY; REFRACTORIES; RESISTORS; SLAG; TREATMENT OF NATURAL STONE

The invention discloses a preparing method of a negative low aging rate negative temperature coefficient thermistor ceramic material. The nominal chemical composition of the thermistor ceramic material is Mn3-x-y-zNixFeyMzO4, wherein M represents Cu, Ti, Sn, and Al, an oxide for constituting anions serves a starting raw material, ball milling is conducted, after multiple times of roasting, organicbinding agent is added for pelleting molding, sintering is conducted, after sheet-like samples are sintered, silver electrodes are arranged on the two end faces, and after the electrodes are burned and permeate, under an oxygen-enriched environment, the portion, free of electrodes and covered with cylinders, of samples is sealed through middle-temperature vitereous glaze. The thermistor ceramic material prepared through the preparing technology has an electrical resistivity of 3-1,000 ohm.m at the temperature of 25 DEG C, has a B value of 3,000-4,000 K at the temperature of 25-85 DEG C, and has a weekly aging rate of