Method for preparing ATO-based PTC (positive temperature coefficient) material

A raw material, press-forming technology, applied in the field of preparation of ATO-based PTC materials, can solve problems such as hidden safety hazards, and achieve the effects of reduced energy consumption, less environmental disturbance, and reduced heat treatment temperature

Active Publication Date: 2013-04-03
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sb-doped SnO 2 Conductive materials have the advantages of high power density, good chemical stability, and low pollution. At present, they have been widely used in the fields of heating pipes for footbaths and heating pipes for small water dispensers. However, due to the NTC effect of ATO ceramics, it brings safety problems. Certain hidden dangers, therefore, it is necessary to develop ATO-based PTC materials

Method used

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  • Method for preparing ATO-based PTC (positive temperature coefficient) material
  • Method for preparing ATO-based PTC (positive temperature coefficient) material
  • Method for preparing ATO-based PTC (positive temperature coefficient) material

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Using diammonium hydrogen phosphate and stannous oxide as raw materials, P 2 o 5 The molar ratio to Sn is 0.3, the raw materials are mixed evenly and then heat-treated at 900°C for 15 minutes, and then water quenched to pulverize the obtained glass slag to obtain PS glass powder. Take by weighing 1 gram of PS glass powder, 5 gram of stannous oxalate, 0.2 gram of stannous chloride, 0.5 gram of antimony trioxide, 0.1 gram of cerium dioxide, mix the above-mentioned raw materials, press molding, and then Heat treatment at 600 degrees for 2 hours to obtain product a, the scanning electron microscope photo of product a is shown in Figure 1a , powder X-ray diffraction pattern see Figure 2a , The resistance-temperature curve 3a of the product.

Embodiment 2

[0022] Using diammonium hydrogen phosphate and stannous chloride as raw materials, P 2 o 5 The molar ratio to Sn is 0.4, the raw materials are mixed uniformly and then heat-treated at 600°C for 15 minutes, and then water quenched to pulverize the obtained glass slag to obtain PS glass powder. Weigh 1.5 grams of PS glass powder, 5 grams of tin dioxide, 0.5 grams of antimony trioxide, and 0.3 grams of ceria, mix the above raw materials, press and shape, and then heat treat at 500 degrees for 2 hours to obtain the product b, the scanning electron micrograph of product b is shown in Figure 1b , powder X-ray diffraction pattern see Figure 2b , The resistance-temperature curve 3b of the product.

Embodiment 3

[0024] Using diammonium hydrogen phosphate and stannous oxide as raw materials, P 2 o 5 The molar ratio to Sn is 0.3, the raw materials are mixed evenly and then heat-treated at 900°C for 15 minutes, and then water quenched to pulverize the obtained glass slag to obtain PS glass powder. Weigh 1.0 grams of PS glass powder, 5 grams of stannous oxalate, 0.4 grams of antimony trioxide, 0.25 grams of cerium oxide, 0.2 grams of cobalt oxide, mix the above raw materials, press and shape, and then heat treat at 500 degrees 2 hours, obtain product c, the scanning electron micrograph of product c sees Figure 1c , powder X-ray diffraction pattern see Figure 2c , The resistance-temperature curve 3c of the product.

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Abstract

The invention relates to a method for preparing an ATO-based PTC (positive temperature coefficient) material, comprising the following steps: preparing PS glass powder by using diammonium phosphate and stannous oxide or by using diammonium hydrogen phosphate and stannous oxide; mixing 5-40% by mass of PS glass powder, 40-90% by mass of tin source matter, 1-30% by mass of antimony source material and 0-25% by mass of doping agent; pressing and forming the mixed powder, and treating at the temperature of 300-1,200 DEG C for 0.5-48 hours to obtain the ATO-based PTC material. The raw materials adopted by the method do not comprise lead or other raw materials which can cause severe pollution to environment, thereby causing less pollution to environment. The heat treatment temperature of the prepared ATO-based PTC material is reduced significantly, and the energy consumption is reduced. The prepared ATO-based PTC material has the advantage of good chemical stability of the SnO2-based material. The method has the advantages that raw materials are easily available, procedures are short, the process is simple, requirements on equipment are low, cost is low, industrialization is easy to realize. The ATO-based PTC material can be used in the acidic, neutral and alkaline conditions and has a wide range of application.

Description

technical field [0001] The invention relates to a method for preparing an ATO-based PTC material. The ATO material prepared by the method can be applied to the field of self-control heating. The material has stable chemical properties and can be used in harsh chemical environments such as strong acid and strong alkali. Background technique [0002] Tin dioxide (SnO 2 ) is an n-type semiconductor material with a band gap of 3.6eV. Due to its high electron mobility (109.56cm 2 / Vs), high carrier concentration (1.23×1O 19 cm 3 ), high light transmittance, high refractive index (1.9-2) and high temperature chemical stability and other physical and chemical properties, doped and undoped SnO 2 The base transparent film has been widely used, such as anti-static filler, transparent conductive coating, ultraviolet shielding film, gas sensor, photoelectric display, solar cell, lithium ion battery electrode, varistor and so on. [0003] The material has a PTC (Positive Temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/457C04B35/622
Inventor 李志祥许高杰李勇蒋俊段雷
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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