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Low resistance/high B-value negative temperature coefficient thermo-sensitive material and method for preparing same

A technology of negative temperature coefficient and heat-sensitive material, applied in the field of low resistivity/high B value negative temperature coefficient heat-sensitive material and its preparation, can solve the problem of difficulty in meeting this requirement, and achieve the effect of good consistency

Active Publication Date: 2008-04-09
山东中厦电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult for any other formula without Co and Ni to meet this requirement

Method used

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  • Low resistance/high B-value negative temperature coefficient thermo-sensitive material and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. Formula: take MnO2, TiO2 and CuO as raw materials, the purity is CP, take MnO2:TiO2:

[0027] CuO=65:15:20(%wt)+8% (additive)

[0028] =70:10:20(%wt)+8% (additive)

[0029] =72:8:20 (%wt)+8% (additive)

[0030] =73:5:20(%wt)+8% (additive)

[0031] Additives: ZnO: CaO: Nb2O5 = 30: 60: 10% wt, ball milled for 8 hours, pre-calcined at 750°C for 3 hours.

[0032] 2. Ball mill the above proportioned ingredients for 12 hours, material: water: ball = 1.0: 1.1: 1.5

[0033] 3. Granulation: Add 23% wt of PVA glue solution with a concentration of 10% to the powder, manually granulate, and pass through a 80-200 mesh sieve.

[0034] 4. Forming: Use 20mpa pressure to form a Ф10 (mm) × 2.0mm green sheet, and the pressing density is 3.6g / cm 3 .

[0035] 5. Put the formed blank into a ceramic bowl and sinter at a high temperature of 1220° C. for 2.5 hours. The sintering curve is 13 hours at 25°-1220°...

Embodiment 2

[0042] The main formula is MnO2: TiO2: CuO=70:10:20%wt, the amount of additives is respectively taken as 5.0, 7.0, 8.0, 9.0, 10.0, 12.0%wt, and the sample of Ф10 is made by the technique of embodiment 1, and its The test results are shown in the table below (based on 100 chips)

[0043] MnO2

[0044] The results show that with the increase of the additive amount, the resistance value decreases, and the B value also decreases obviously. When the amount of additives reaches 12%, the resistance is 5Ω, the B value is only 2280K, and the dispersion of the material becomes larger.

Embodiment 3

[0046] The formula is MnO2: TiO2: CuO=70:10:20%wt, the amount of additives is 8%wt [according to the process of Example 1] to make Ф10 blanks, and sintering at different sintering temperatures. The measurement results of the samples are shown in the following table (Based on 100 chips)

[0047] Sintering temperature

(T / ℃)

MnO2

(%wt)

TiO2

(%wt)

CuO

(%wt)

Additives

(%wt)

ρ25 / Ωcm

B 25 / 50 / k

1160

1180

1200

1220

1240

1260

1280

70

70

70

70

70

70

70

10

10

10

10

10

10

10

20

20

20

20

20

20

20

8

8

8

8

8

8

8

534.8±18％

116.4±8％

55.6±5％

54.8±3％

38.4±7％

18.6±21％

10.4±34％

2874±3.6％

2810±1.0％

2770±0.4％

2740±0.6％

2700±1.2％ ...

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Abstract

The invention discloses a thermo-sensitive material for a temperature sensitive unit in the field of the sensor technology, in particular discloses a thermo-sensitive material with low resistivity and high B value negative temperature coefficient. The invention is characterized in that Mn-Ti-Cu oxide and Zn-Ca-Nb additive are made by a ceramic technique into the thermo-sensitive material with a spinel structure; the density of the material is 4.9-5.1g / cm <3>. The resistivity of the material stands at 20-100omega*cm under the temperature of 25 DEG C, and the B value is 2,600-3,300K under the temperature of 25 to 50DEG C. The invention has the advantages of low resistivity and high B value, and being an important material required for a power thermistor. The cost of the material is merely one third or a quarter of the cost of the commonly used material. Moreover, the invention has good consistency, repetition and stability, and is in particular applied to a surge current absorption NTCR component.

Description

(1) Technical field [0001] The invention relates to a heat-sensitive material required for a temperature-sensitive element in the technical field of sensors, in particular to a low-resistivity / high-B value negative temperature coefficient heat-sensitive material and a preparation method thereof. (2) Background technology [0002] Power type NTCR is widely used in temperature compensation and protection of circuits and electrical components in various fields. Due to the high power, large component volume, and many materials used, the low cost of materials has become the goal pursued by manufacturers. Initially, Mn-Co-Cu materials were used. Due to the rising price of Co (the unit price of CO3O4 is about 430 yuan / kg), people switched to Mn-Ni-Cu materials instead of Mn-Co-Cu. The current Ni price is 4-5 times higher than the early price (the current price of NiO is 280 yuan / kg), forcing people to seek formulas that do not contain Ni. So far, no Ni-free formula that meets the...

Claims

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Application Information

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IPC IPC(8): C04B35/36C04B35/38C04B35/63
Inventor 陶明德刘倩
Owner 山东中厦电子科技有限公司
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