Fluorocarbon gel for automobile manifold absolute pressure sensor

摘要

In recent years, automobile manifold absolute pressure sensors are needed to reduce the number of the structural parts dew to low cost, Therefore, the material to protect the IC sensor chip against the ambient circumstance are demanded to have high functions. So far, we have adopted a partial filled structure that is filled with fluorosilicone gel on the organic thin film to protect the IC sensor chip against the exhaust gas or gasoline vapor. In order to reduce the number of the structural parts, we need to develop a full filled structure that is filled with a gel only without the organic thin film. As the diffusion of the gasoline causes the bubbles and cracks in the gel dew to the big thickness of the full filled structure, we have to develop the new material to prevent the bubbles and cracks in the gel. In the paper, we analyzed the mechanism of the bubbles and cracks theoretically and reported that we can accomplish both low cost and high reliability by developing a fluorocarbon gel that have high fluorine ratio and is able to prevent the bubbles and cracks.