How to choose a suitable thick film conductive gold paste for sensors

With the development of technology, the application of sensors in various fields is becoming increasingly widespread. The performance of sensors mainly depends on theirThick film conductive gold pasteThe choice. This article will explore how to choose a suitable thick film conductive gold paste for sensors from different perspectives.

1. The fired film has good density and smoothness

The density and smoothness of the sintered film of thick film conductive gold paste for sensors are crucial to the performance of the sensors. A dense sintered film can effectively prevent the penetration of gases and liquids, protecting the sensitive components inside the sensor. A smooth surface can reduce the impact of roughness on sensor sensitivity. This is particularly important for sensors that require high-precision measurements.

2. Has good matrix compatibility

There are various options for the substrate materials of sensors, such as glass substrate, Al2O3 ceramic substrate, and ZrO substrate. Choosing the appropriate thick film conductive gold paste for sensors requires consideration of its compatibility with the substrate material. The thermal expansion coefficient and thermal conductivity of different matrix materials are different, so it is necessary to choose thick film conductive gold paste that matches the matrix material to ensure good adhesion and stability.

3. Selection of Technical Parameters

When selecting thick film conductive gold paste for sensors, it is necessary to refer to its technical parameters. Taking YB-8820 as an example, its gold content is 80 ± 2%, viscosity is 80 ± 20Pa. s (14 #/10r), and body resistance is ≤ 4.0 × 10-5m Ω. The selection of these technical parameters should be determined based on the specific application requirements. The choice of gold content can affect conductivity, viscosity can affect the implementation of printing processes, and bulk resistance is an indicator for evaluating conductivity. According to the requirements of the application, these parameters can be adjusted appropriately.

4. Development of reference process conditions

In addition to technical parameters, reference process conditions are also factors that need to be considered when selecting thick film conductive gold paste for sensors. Taking screen printing as an example, the mesh size is selected within the range of 250-300 mesh, which can enable the thick film to be uniformly printed on the substrate. The drying conditions are 150-200 ℃/5min, which can uniformly raise the temperature of the thick film during drying and avoid the generation of bubbles. The firing conditions are a peak temperature of 850-900 ℃, holding for 10 minutes, and a sintering period of 45-60 minutes. These conditions can achieve the best performance of the thick film during the sintering process.

In summary, choose the appropriate oneThick film conductive gold paste for sensorsMultiple factors need to be considered, including the density, smoothness, substrate compatibility, technical parameters, and reference process conditions of the fired film. Only when these aspects are balanced and considered can the most suitable thick film conductive gold paste for sensors be selected. This will help improve the performance and reliability of sensors, meeting the needs of different application fields.