一种1Cr18Ni9不锈钢基片PTC厚膜电路的实现方法

An achievement method of PTC thick-film circuit based on 1Cr18Ni 9 stainless steel substrate

为了将PTC（positive temperature coefficient）电子浆料以厚膜电路的形式制备在不锈钢基片上，并把不锈钢本体作为散热器，引出电极利用PTC效应制成可控电热元件．方法：提出基于1Cr18Ni9不锈钢基片的PTC厚膜电路的组成结构，并根据ICr18Ni9的膨胀系数和电路元件的电气特性实现了厚膜电路PTC电子浆料的应用设计技术．结果显示以PTC厚膜电路材料组成的可控电热元件，其功率密度高达200W／cm^2；其电阻膜层的表面加热速度可达200—300℃／s；其使用寿命达到1万小时以上．可见与传统的电热合金材料、陶瓷基片加热器以及元件组合的加热器相比，本实现技术电路具有功率密度大、响应速度快、加热温度可控等优点。

Electronic paste method is prepared on stainless steel substrate by PTC（Positive Temperature Coefficient）electronic pastes with thick-film circuit form, in which stainless steel substrate acting as radiator. Proposes a new composite structure of PTC thick-film circuit based on 1Cr18 Ni 9 stainless steel substrate. Application design technology of PTC electronic pastes is also investigated according to expan- sion coefficients of 1Cr18Ni 9 stainless steel and electric characteristic of circuit elements. The heat devices of PTC thick-film circuit have many advantages, for example, power-density to 200 and surface heating speed of resister film with 200 -300 ℃/s as well as using over ten thousand. Compared with conventional heating alloy material, ceramic substrate heater and PTC composite elements heater, the proposed technology circuit has some advantages such as high-power density, high response speed, controllable heating temperature and so on.