High-curie-point lead-free PTC (Positive Temperature Coefficient) ceramic material and preparation method thereof

A technology of ceramic materials and mixtures, applied in the direction of resistors with positive temperature coefficients, etc., can solve problems such as human body and natural environment hazards, and achieve the effects of easy control of reaction conditions, good filling performance, and simple preparation process

Active Publication Date: 2014-08-27
盐城青墩津邦水务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Pb-containing oxides inevitably flow into the living environment and the natural environment due to various reasons, thereby causing harm to the human body and the natural environment.

Method used

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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 milling was performed at a speed of 400r / 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 925°C for 2 hours to synthesize K 0.5 Bi 0.5 TiO 3 Powder, the mixture B was incubated at 1100°C for 3h to synthesize BaTiO 3 Powder;

[0026] 3) will K 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder and SiO 2 According to the recipe Ba 1-x (K 0.5 Bi 0.5 ) x TiO 3 +ySiO 2 Carry out batching to obtain mixture C, wherein x=0.05, y=0.05, add a certain amount of deionized water to mixture C and ball mill at 400r / min for 4 hours, filter to remove ball stones after ball mill...

Embodiment 2

[0032] 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 2The 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;

[0033] 2) After step 1), the mixture A was incubated at 930°C for 3h to synthesize K 0.5 Bi 0.5 TiO 3 Powder, the mixture B was incubated at 1130°C for 2h to synthesize BaTiO 3 Powder;

[0034] 3) will K 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder and SiO 2 According to the recipe Ba 1-x (K 0.5 Bi 0.5 ) x TiO 3 +ySiO 2 Perform batching to obtain mixture C, where x=0.07, y=0.05, add a certain amount of deionized water to mixture C and ball mill at a speed of 350r / min for 4 hours, filter to remove ball stones after ball milling, a...

Embodiment 3

[0040] 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;

[0041] 2) After step 1), the mixture A was incubated at 950°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;

[0042] 3) will K 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder and SiO 2 According to the recipe Ba 1-x (K 0.5 Bi 0.5 ) x TiO 3 +ySiO 2 Perform batching to obtain mixture C, where x=0.10, y=0.05, add a certain amount of deionized water to mixture C, and then ball mill at a speed of 500r / min for 4 hours, filter to remove ball stones after ball milling, a...

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Abstract

The invention provides a high-curie-point lead-free PTC (Positive Temperature Coefficient) ceramic material and a preparation method of the ceramic material. The ceramic material mainly comprises Ba1-x(K0.5Bi0.5)xTiO3, wherein x is more than or equal to 0.05 and smaller than or equal to 0.3. The high-curie-point PTC ceramic material provided by the invention does not contain lead, so damages of resistor devices to the human bodies and the environment in manufacturing and using processes are avoided; the processes of oxidation and then reduction are adopted, so semi-conduction of the material is achieved without donor doping; and PTC heat-sensitive materials with different curie points can be prepared through controlling the doping quantities of KBT (KBiTiO).

Description

technical field [0001] The invention relates to a semiconductor material, in particular to a lead-free, low-resistance K 0.5 Bi 0.5 TiO 3 (KBT) High concentration doped BaTiO 3 (BT) High Curie point lead-free PTC thermistor ceramic material and its preparation method. 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 products a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02C04B35/468C04B35/622
Inventor 蒲永平袁启斌
Owner 盐城青墩津邦水务有限公司
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