CN107903042A - 一种ntc热敏电阻的制备方法 - Google Patents

一种ntc热敏电阻的制备方法 Download PDF

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CN107903042A
CN107903042A CN201711149309.7A CN201711149309A CN107903042A CN 107903042 A CN107903042 A CN 107903042A CN 201711149309 A CN201711149309 A CN 201711149309A CN 107903042 A CN107903042 A CN 107903042A
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江明泓
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Abstract

本发明公开了一种NTC热敏电阻的制备方法，本发明所述方法首先将各物料混合均匀，进行球磨，而后进行一次煅烧，煅烧完成后加入粘合剂、分散剂进行搅拌，搅拌均匀后送入球磨机中进行研磨，烘干后造粒，然后进行压制、煅烧，最后被电极，得到产品。本发明制得的热敏电阻线性度较好，能够在较宽温度范围内使用，避免用户在高温段因阻值较小信号较弱需要串联电阻，同时具有高电阻高B值，能满足特殊客户在高温测量中的应用。

Description

一种NTC热敏电阻的制备方法
技术领域
本发明涉及陶瓷电阻体领域，尤其是涉及一种NTC热敏电阻的制备方法。
背景技术
NTC热敏电阻即负温度系数热敏电阻，是以高纯度过渡金属氧化物，如锰、钴、镍和铁等金属氧化物为主要材料，采用陶瓷工艺制造而成的半导体陶瓷元件。近几年，随着NTC热敏电阻的发展，传统的块材NTC热敏电阻逐渐显示出局限性，开始转向制备体积小、精度高、敏感性好、稳定性高的NTC热敏电阻。
目前,对于通用型NTC热敏电阻材料，电子工业基本采用以Mn-Co-Ni-Cu-Fe系过渡金属氧化物中选择2～4种，经配料、成型、烧结等传统陶瓷工艺制成热敏电阻器。但该热敏电阻元器件为尖晶石型结构，在1300℃或以上温度烧结，其室温电阻率一般比较大，稳定性较差。而且这些过渡金属氧化物地表含量较低，最终会引起工业生产成本提高，不适合未来工业化应用。
发明内容
本发明提供了一种NTC热敏电阻的制备方法，以解决现有通用型NTC热敏电阻材料生产成本高，不适合未来工业化应用的问题。
为了解决上述技术问题，本发明采用的技术方案概述如下：
一种NTC热敏电阻的制备方法，包括如下步骤：
1)按照配比称取各原料，并加入球磨机中，球磨混合15-18h得到混合物，其中各原料的重量份分别为：氧化铝43份；氧化镁7份；二氧化锰22份；三氧化二镍25份；三氧化二铁11份；三氧化二钇4份；三氧化二钴17份；
2)将步骤1)所述的混合物在煅烧炉中煅烧2-4h得到煅烧物A，其中煅烧温度为在900℃-960℃；
3)在步骤2)制得的煅烧物A中加入粘合剂、分散剂，并在搅拌机中搅拌40-60min，再用球磨机对浆料进行充分研磨，研磨时间4-7h，而后烘干、造粒；
4)将步骤3)造粒后的物料模压成型制得坯体；
5)对步骤4)制得的坯体于1100℃-1200℃高温炉中烧结3-5h，烧成陶瓷片，然后被电极，即得到NTC热敏电阻材料。
更进一步地，所述分散剂为无水乙醇、去离子水或丙酮中的任意一种。
更进一步地，所述粘结剂为质量浓度为6～8％的PVA溶液；PVA溶液的加入质量占粉料质量的3～6％。
更进一步地，步骤4)中所述的模压成型的压力控制在220～280MPa。
综上所述，由于采用了上述技术方案，本发明的有益效果是：
1.通过合理配料和制备，得到的热敏电阻材料线性度较好，能够在较宽温度范围内使用，避免用户在高温段因阻值较小信号较弱需要串联电阻，同时具有高电阻高B值，能满足特殊客户在高温测量中的应用；
2.本发明的原料易得、且制备方法简单，缩短了生产时间，提高了生产效率具有良好的应用前景。
具体实施方式
下面结合具体实施方式对本发明作进一步详细说明。本发明的实施方式包括但不限于下列实施例。
实施例1
一种NTC热敏电阻的制备方法，包括如下步骤：
1)按照配比称取各原料，并加入球磨机中，球磨混合15h得到混合物，其中各原料的重量份分别为：氧化铝43份；氧化镁7份；二氧化锰22份；三氧化二镍25份；三氧化二铁11份；三氧化二钇4份；三氧化二钴17份；
2)将步骤1)所述的混合物在煅烧炉中煅烧2h得到煅烧物A，其中煅烧温度为在960℃；
3)在步骤2)制得的煅烧物A中加入占混合物质量3％的PVA、无水乙醇，并在搅拌机中搅拌40min，再用球磨机对浆料进行充分研磨，研磨时间4h，而后烘干、造粒；
4)将步骤3)造粒后的物料在220MPa条件下模压成型制得坯体；
5)对步骤4)制得的坯体于1100℃高温炉中烧结5h，烧成陶瓷片，然后被电极，即得到NTC热敏电阻材料。
实施例2
一种NTC热敏电阻的制备方法，包括如下步骤：
1)按照配比称取各原料，并加入球磨机中，球磨混合18h得到混合物，其中各原料的重量份分别为：氧化铝43份；氧化镁7份；二氧化锰22份；三氧化二镍25份；三氧化二铁11份；三氧化二钇4份；三氧化二钴17份；
2)将步骤1)所述的混合物在煅烧炉中煅烧4h得到煅烧物A，其中煅烧温度为在900℃；
3)在步骤2)制得的煅烧物A中加入占混合物质量6％的PVA、丙酮，并在搅拌机中搅拌60min，再用球磨机对浆料进行充分研磨，研磨时间7h，而后烘干、造粒；
4)将步骤3)造粒后的物料在280MPa压力下模压成型制得坯体；
5)对步骤4)制得的坯体于1200℃高温炉中烧结3h，烧成陶瓷片，然后被电极，即得到NTC热敏电阻材料。
实施例3
一种NTC热敏电阻的制备方法，包括如下步骤：
1)按照配比称取各原料，并加入球磨机中，球磨混合17h得到混合物，其中各原料的重量份分别为：氧化铝43份；氧化镁7份；二氧化锰22份；三氧化二镍25份；三氧化二铁11份；三氧化二钇4份；三氧化二钴17份；
2)将步骤1)所述的混合物在煅烧炉中煅烧3h得到煅烧物A，其中煅烧温度为在950℃；
3)在步骤2)制得的煅烧物A中加入占混合物质量5％的PVA、去离子水，并在搅拌机中搅拌55min，再用球磨机对浆料进行充分研磨，研磨时间5h，而后烘干、造粒；
4)将步骤3)造粒后的物料在250MPa压力下模压成型制得坯体；
5)对步骤4)制得的坯体于1150℃高温炉中烧结4h，烧成陶瓷片，然后被电极，即得到NTC热敏电阻材料。
如上所述即为本发明的实施例。本发明不局限于上述实施方式，任何人应该得知在本发明的启示下做出的结构变化，凡是与本发明具有相同或相近的技术方案，均落入本发明的保护范围之内。

Claims (4)

1.一种NTC热敏电阻的制备方法，其特征在于，包括如下步骤：
1)按照配比称取各原料，并加入球磨机中，球磨混合15-18h得到混合物，其中各原料的重量份分别为：氧化铝43份；氧化镁7份；二氧化锰22份；三氧化二镍25份；三氧化二铁11份；三氧化二钇4份；三氧化二钴17份；
2)将步骤1)所述的混合物在煅烧炉中煅烧2-4h得到煅烧物A，其中煅烧温度为在900℃-960℃；
3)在步骤2)制得的煅烧物A中加入粘合剂、分散剂，并在搅拌机中搅拌40-60min，再用球磨机对浆料进行充分研磨，研磨时间4-7h，而后烘干、造粒；
4)将步骤3)造粒后的物料模压成型制得坯体；
5)对步骤4)制得的坯体于1100℃-1200℃高温炉中烧结3-5h，烧成陶瓷片，然后被电极，即得到NTC热敏电阻材料。
2.如权利要求1所述的一种NTC热敏电阻的制备方法，其特征在于，所述分散剂为无水乙醇、去离子水或丙酮中的任意一种。
3.如权利要求1所述的一种NTC热敏电阻的制备方法，其特征在于，所述粘结剂为质量浓度为6～8％的PVA溶液；PVA溶液的加入质量占粉料质量的3～6％。
4.如权利要求1所述的一种NTC热敏电阻的制备方法，其特征在于，步骤4)中所述的模压成型的压力控制在220～280MPa。
CN201711149309.7A 2017-11-18 2017-11-18 一种ntc热敏电阻的制备方法 Pending CN107903042A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112047725A (zh) * 2020-09-14 2020-12-08 鑫国集团有限公司 一种热敏电阻材料及其制备方法
CN116283274A (zh) * 2023-03-06 2023-06-23 肇庆市金龙宝电子有限公司 一种基于稀土元素的ntc热敏电阻材料及其制备方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112047725A (zh) * 2020-09-14 2020-12-08 鑫国集团有限公司 一种热敏电阻材料及其制备方法
CN116283274A (zh) * 2023-03-06 2023-06-23 肇庆市金龙宝电子有限公司 一种基于稀土元素的ntc热敏电阻材料及其制备方法
CN116283274B (zh) * 2023-03-06 2024-04-16 肇庆市金龙宝电子有限公司 一种基于稀土元素的ntc热敏电阻材料及其制备方法

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