It’s HIP to Use Pressure

Welcome to All Sensors “Put the Pressure on Us” blog. This blog brings out pressure sensor aspects in a variety of applications inspired by headlines, consumer and industry requirements, market research, government activities, and you.

It’s HIP to Use Pressure

The hot isostatic pressing (HIP) process uses the combination of high pressures and high temperatures to densify engineering ceramics and hard metals. The results of this process, densification and removal of porosity, lead to improved mechanical properties such as increased strength and reliability.

In the process, pressures up to 207 MPa (30,000 psi) may be combined with temperatures as high as 2000°C (3,632°F), however, some HIP processes can go as high as 414 MPa (60,000 psi). An inert gas (typically Argon or Nitrogen) sealed within a pressure vessel ensures that pressure is applied uniformly (isostatic pressure) from all sides. The inert gas helps to reduce any oxidation effects.

A pressure vessel is used in the HIP process. Source: AZO Materials
A pressure vessel is used in the HIP process. Source: AZO Materials

HIPing, as it is also called, is used in many engineering ceramic applications to increase the density of the material and increase the strength and reliability of the components. Examples include:
⋅ silicon nitride ball bearings
⋅ body armor
⋅ zirconia and alumina dental implants
⋅ multi-layer capacitors
⋅ downhole oilfield components
⋅ sputtering targets

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