Hypersonic Speed & Ultra-High Temperature Ceramics

Published on Oct 4, 2021 | Last updated May 23, 2022

Light Speed

The history of speed shows the greatest ingenuity, in developing from a single horsepower to some of the mightiest machines traveling at the greatest velocities.Speed has always required cutting edge technology to continue breaking the constraints, to allow us to move faster, in a whole range of environments.

Ceramics have enabled the manufacture of machines to travel at speeds in harsh environments, particularly in the last decades where any increase in speed causes an increase in friction in our atmosphere, to the point where the heat generated from atmospheric friction can erode the materials used. High temperature requirements, combined with other demands for lightweight materials and resistance to wear, materials in the Boride Nitride and Carbide groups combined with transitional elements such as tantalum, Hafnium, and titanium are some of the materials being used.

Precision Ceramics range of ceramic materials offer varying characteristics to match similar demanding requirements.

Manned Space craft re-entering the earth’s atmosphere from low earth orbit can be travelling at over 10,000 meters per second with re-entry temperatures of over 1800°C. This is above the melting point of steel, and the glow from the heat shielding can be easily seen during this deceleration.

The space shuttle ceramic shielding was the one of the stories in this phase of space exploration, but the shuttle itself was only capable of 18,000 miles an hour in space.

Ceramics within the atmosphere have reached their greatest challenge with the dawn of Hypersonic flight. Hypersonic is classed as Mach 5 or above, possibly up to Mach 15, but at Mach 5 or 3800 mph, temperatures are already at 1800°C on the leading edges. In comparison a typical rifle bullet travels at only Mach 3.

A projectile travelling at Mach 15, could be seeing temperatures of over 6000°C in the Atmosphere. The current best ceramic Hafnium Carbide has a melting point of 3958°C, so the challenge is the protection of a projectile not from the enemy but from nature.

Ultra-High Temperature ceramics (UHTC) are classed as those with Melting points over 2000°C so you can see the challenge. The elevated temperature combined with the presence of oxygen increases the problems.

Once out of the earth’s Atmosphere, speeds can increase without the corresponding temperature increase and again ceramics are at the forefront. The development of Electrical propulsion in space has led the way to reducing the cost of satellites, and space exploration, where photon energy from the sun is converted to electrical energy, which is used to propel plasma over a ceramic insulator. The ceramic a BN/AlN compound – Shapal Hi-M Soft – or a BN material such as PCBN5000 with excellent electrical insulation allows the plasma to accelerate to up to 20,000 meters a second.

The current record holder is the Juno probe at 165,000 mph, an electrically powered spacecraft.

Interested in finding out more and if any of our materials are the right fit for your application? Please don’t hesitate to get in touch.

Related topics:

Macor Material Brand

Materials

Precision Ceramics offers a wide range of advanced advanced ceramic materials to ensure that we have the right material for your application.

Shapal Material Brand

Shapal Hi M Soft™

Machinable AlN

Shapal Hi-M Soft is a hybrid type of machinable Aluminium Nitride (AlN) ceramic that offers high mechanical strength and thermal conductivity.

Most Recent Posts

Precision Ceramics – Over a Decade of Trade Shows

Precision Ceramics – Over a Decade of Trade Shows

Precision Ceramics has attended a number of trade shows over the past 2 decades in various locations. Since 2012, it had been common for Precision Ceramics to attend two major exhibitions every year, generally one in Europe and the other in the USA. More recently, the...

High Strength “Ceramic Steel” Zirconia

High Strength “Ceramic Steel” Zirconia

Unlike traditional ceramics that tend to be hard and brittle, Zirconia (ZrO2) has high strength, wear resistance and a flexibility far beyond those of most other technical ceramics. Zirconia (ZrO2) also has excellent corrosion and chemical resistance without the...

Precision Ceramics & The Environment – Our Personal Quest Continues

Precision Ceramics & The Environment – Our Personal Quest Continues

Harnessing energy from the sun, the wind and the waves and tide holds greater and greater promise for the United Kingdom’s clean energy future.Nowadays, everywhere you look, the roofs of office blocks, factory buildings and domestic properties have taken on a...