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Current limit switch type lead-free PTC (Positive Temperature Coefficient) ceramic material and preparation method thereof

A ceramic material and switch-type technology, which is applied in the field of preparation of thermistor ceramic materials, can solve the problems of increased resistance and low resistance, and achieve the effects of stable performance, large output and high reliability

Active Publication Date: 2012-10-24
盐城青墩津邦水务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the application of PTC materials with the performance of a sharp increase in resistance as the temperature rises, as a thermal switch or circuit protector, is still very little research.

Method used

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  • Current limit switch type lead-free PTC (Positive Temperature Coefficient) ceramic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) First put K 2 CO 3 、 Bi 2 o 3 and TiO 2 According to K 2 CO 3 : Bi 2 o 3 :TiO 2 =1:1:4 molar ratio mixed to get mixture A, then BaCO 3 and TiO 2 The mixture B was mixed according to the molar ratio of 1:1, deionized water was added to the mixture A and the mixture B, and ball milled at a speed of 450r / min for 4 hours respectively, after ball milling, the pebbles were removed by filtration, and then dried at 80°C;

[0025] 2) After step 1), the mixture A was incubated at 910°C for 3h to synthesize K 0.5 Bi 0.5 TiO 3 Powder, the mixture B was incubated at 1120°C for 3h to synthesize BaTiO 3 Powder;

[0026] 3) will K 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder, CaCO 3 , Yb 2 o 3 and M according to recipe Ba 1-x-y Ca y (K 0.5 Bi 0.5 ) x TiO 3 +zYb 2 o 3 +nM to obtain mixture C, where x=0.05, y=0.05, z=0.005, n=0.001, M is La 2 o 3 , add deionized water to the mixture C, ball mill at 450r / min for 4 hours, filter to remove the ball stones after ...

Embodiment 2

[0031] 1) First put K 2 CO 3 、 Bi 2 o 3 and TiO 2 According to K 2 CO 3 : Bi 2 o 3 :TiO 2 =1:1:4 molar ratio mixed to get mixture A, then BaCO 3 and TiO 2 The mixture B was mixed according to the molar ratio of 1:1. Deionized water was added to the mixture A and the mixture B, and ball milled at a speed of 350r / min for 4 hours respectively. After the ball milling, the ball stones were removed by filtration, and then dried at 90°C;

[0032] 2) After step 1), the mixture A was incubated at 920°C for 2h to synthesize K 0.5 Bi 0.5 TiO 3 Powder, the mixture B was incubated at 1150°C for 3h to synthesize BaTiO 3 Powder;

[0033] 3) will K 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder, CaCO 3 , Yb 2 o 3 and M according to recipe Ba 1-x-y Ca y (K 0.5 Bi 0.5 ) x TiO 3 +zYb 2 o 3 +nM to obtain mixture C, wherein x=0.10, y=0.08, z=0.008, n=0.002, M is Nb 2 o 5 , add deionized water to the mixture C, ball mill at 350r / min for 4 hours, filter to remove the ball sto...

Embodiment 3

[0038] 1) First put K 2 CO 3 、 Bi 2 o 3 and TiO 2 According to K 2 CO 3 : Bi 2 o 3 :TiO 2 =1:1:4 molar ratio mixed to get mixture A, then BaCO 3 and TiO 2 The mixture B was mixed according to the molar ratio of 1:1, deionized water was added to the mixture A and the mixture B, and ball milled at a speed of 500r / min for 4 hours respectively, after ball milling, the pebbles were removed by filtration, and then dried at 100°C;

[0039] 2) After step 1), the mixture A was incubated at 900°C for 2 hours to synthesize K 0.5 Bi 0.5 TiO 3 Powder, the mixture B was incubated at 1100°C for 2h to synthesize BaTiO 3 Powder;

[0040] 3) will K 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder, CaCO 3 , Yb 2 o 3 and M according to recipe Ba 1-x-y Ca y (K 0.5 Bi 0.5 ) x TiO 3 +zYb 2 o 3 +nM to obtain mixture C, wherein x=0.15, y=0.10, z=0.010, n=0.0015, M is La 2 o 3 , add deionized water to the mixture C, and then ball mill at a speed of 500r / min for 4h, filter to remov...

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Abstract

The invention provides a current limit switch type lead-free PTC (Positive Temperature Coefficient) ceramic material and a preparation method of the ceramic material. The main component of the material is Ba1-x-yCay(K0.5Bi0.5)xTiO3+zYb2O3+nM, wherein x is more than or equal to 0.05 and less than or equal to 0.3, y is more than or equal to 0.05 and less than or equal to 0.13, z is more than or equal to 0.005 and less than or equal to 0.04, n is more than or equal to 0.001 and less than or equal to 0.005, and M is a semiconducting element. The current limit switch type PTC ceramic material does not contain lead, so the damages to the human bodies and the environment of resistor devices in the manufacturing and using processes are avoided; and a doping process of the trace semiconducting element is adopted, so the semiconducting problem of the PTC heat sensitive material at the room temperature is solved; and the resistance temperature coefficient alpha of the PTC heat sensitive material can be controllably regulated through controlling the doping quantity of Yb2O3.

Description

technical field [0001] The invention relates to a semiconductor material, in particular to a method for preparing a thermistor ceramic material conforming to lead-free, high lift-to-drag ratio, large resistance temperature coefficient, and positive temperature coefficient (PTC). Background technique [0002] BaTiO 3 Positive temperature coefficient resistance (PTCR for short) ceramic material is a ferroelectric semiconductor material and one of the new electronic materials that has developed rapidly in recent years. Because PTCR ceramic materials have automatic "switching" functions such as temperature sensitivity, current limiting, and time delay, they have been widely used in various fields such as electronic communications, aerospace, automobile industry, and household appliances. [0003] However, the current practical piezoelectric and ferroelectric materials mainly use Pb as the mobile agent of the Curie point, and replace the lattice position of Ba with Pb. Such pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/475C04B35/622
Inventor 蒲永平袁启斌
Owner 盐城青墩津邦水务有限公司
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