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

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Problems solved by technology

It is difficult for any other formula wi

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

Example Embodiment

[0025] Example 1:

[0026] 1. Formula: MnO2, TiO2 and CuO are used as raw materials, the purity is CP, and 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 milling for 8 hours, pre-sintering at 750°C for 3 hours.

[0032] 2. Ball mill the above formula 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 an 80-200 mesh sieve.

[0034] 4. Forming: Use 20mpa pressure to form a Ф10(mm)×2.0mm blank with a compaction density of 3.6g / cm 3 .

[0035] 5. Put the formed green sheet into a ceramic pot and sinter at a high temperature of 1220°C for 2.5 hours. The sintering curve is 25°-1220°C for 13 hours, that is, the heat...

Example Embodiment

[0041] Example 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 a Ф10 sample is made according to the process of Example 1. The test results are as follows (counted with 100 chips)

[0043] MnO2

[0044] The results showed that with the increase of the additive dosage, the resistance value decreased, and the B value also decreased significantly. 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.

Example Embodiment

[0045] Example 3:

[0046] The formula is MnO2:TiO2:CuO=70:10:20%wt, and the amount of additives is 8%wt [according to the process of Example 1] to make Ф10 green sheets, and sinter them at different sintering temperatures. The measurement results of the samples are as follows (Counted with 100 chips)

[0047] Sintering temperature

[0048] The results show that if the sintering temperature is lower than 1220℃ and higher than 1240℃, the sample consistency will deteriorate. Therefore, the optimal temperature is 1220-1240℃. If the amount of CuO in the formula increases, the sintering temperature will decrease. Similarly, the amount of CuO will decrease. Contains a corresponding increase.

[0049] The material formula and preparation technology of the present invention can be mass-produced, the performance of the material meets the requirements of compensating NTCR and surge NTCR, and the cost of the material is only one-third or one-fourth of the price of conventional ...

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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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