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

A technology of ceramic materials and mixtures, which is applied to resistors with positive temperature coefficients, etc., can solve problems such as harm to the human body and the natural environment, and achieve the effects of easy control of reaction conditions, large output and good filling.

Active Publication Date: 2014-07-02
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

[0022] 1) First put Na 2 CO 3 、 Bi 2 o 3 and TiO 2 According to Na 2 CO 3 : Bi 2 o 3 :TiO 2 =1:1:4 molar ratio is mixed to obtain mixture A, and then BaCO 3 and TiO 2 Mixed according to the molar ratio of 1:1 to obtain mixture B, added deionized water to mixture A and mixture B, and then ball milled at a speed of 500r / min for 4 hours, filtered to remove the ball stones after ball milling, and then dried at 80°C;

[0023] 2) After step 1), the mixture A was incubated at 850°C for 2h to synthesize Na 0.5 Bi 0.5 TiO 3 Powder, the mixture B was incubated at 1120°C for 3h to synthesize BaTiO 3 Powder;

[0024] 3) Na 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder and SiO 2 According to the recipe Ba 1-x (Na 0.5 Bi 0.5 ) x TiO 3 +ySiO 2 Perform batching to obtain mixture C, where x=0.08, 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, and then pass t...

Embodiment 2

[0030] 1) First put Na 2 CO 3 、 Bi 2 o 3 and TiO 2 According to Na 2 CO 3 : Bi 2 o 3 :TiO 2 =1:1:4 molar ratio is mixed to obtain mixture A, and then BaCO 3 and TiO 2 Mixed according to the molar ratio of 1:1 to obtain the mixture B, adding deionized water to the mixture A and the mixture B, respectively, ball milling at a speed of 350r / min for 4h, filtering to remove the ball stones after ball milling, and then drying at 100°C;

[0031] 2) After step 1), the mixture A was incubated at 830°C for 2h to synthesize Na 0.5 Bi 0.5 TiO 3 Powder, the mixture B was incubated at 1135°C for 3h to synthesize BaTiO 3 Powder;

[0032] 3) Na 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder and SiO 2 According to the recipe Ba 1-x (Na 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 350r / min for 4 hours, filter to remove the ball stones after ball milli...

Embodiment 3

[0038] 1) First put Na 2 CO 3 、 Bi 2 o 3 and TiO 2 According to Na 2 CO 3 : Bi 2 o 3 :TiO 2 =1:1:4 molar ratio is mixed to obtain mixture A, and then BaCO 3 and TiO 2 Mixed according to the molar ratio of 1:1 to obtain mixture B, adding deionized water to mixture A and mixture B, and then ball milling at a speed of 400r / min for 4h, after ball milling, filtering to remove the ball stones, and then drying at 90°C;

[0039] 2) After step 1), the mixture A was incubated at 800°C for 3h to synthesize Na 0.5 Bi 0.5 TiO 3 Powder, the mixture B was incubated at 1150°C for 2h to synthesize BaTiO 3 Powder;

[0040] 3) Na 0.5 Bi 0.5 TiO 3 Powder, BaTiO 3 Powder and TiO 2 According to the recipe Ba 1-x (Na 0.5 Bi 0.5 ) x TiO 3 +yTiO 2 Perform batching to obtain mixture C, where x=0.20, y=0.05, add a certain amount of deionized water to mixture C, and ball mill for 4 hours at a speed of 400r / min. After ball milling, filter to remove ball stones, and then pass throu...

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PUM

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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 main component of the ceramic material is Ba1-x(Na0.5Bi0.5)xTiO3, wherein x is more than or equal to 0.08 and less than or equal to 0.3. The high-curie-point PTC ceramic material provided by the invention 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; 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 NBT (NaBiTiO).

Description

technical field [0001] The invention relates to a semiconductor material, in particular to a lead-free, low-resistance Na 0.5 Bi 0.5 TiO 3 (NBT) highly 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 are widely u...

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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