Rotary Ceramic

Can you recommend a better ceramic type beside zirconia-CeTZP for my invented rotary engine I post in the Net?

I have a design entry in NASA sponsored contest in http://createthefuturecontest.com/pages/view/entriesdetail.html?entryID=766 but all I need is an appropriate ceramic that is tougher enough to be made into thinner components that would not easily fracture and can withstand abrasion due to sliding surface contact. This would generally help me to achieve a sleeveless rotary engine, which might not need lubrication at all.

No, zirconia is an excellent choice. The other options are Aluminum Nitride, Silicon Carbide and Silcon Nitride.

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A process of high speed thermal spray Oxyfuel (HVOF) may be just what you need.

HVOF spraying has been developed primarily for production of high quality ceramic coatings with properties superior to the conventional spraying processes of flame. It is a dry process that also can produce a dense metallic coating desired physical properties of which are equal to or exceed those of hard chrome plating (HCP).

How it works

The HVOF process uses oxygen and hydrogen normally (although other fuels also be used) as the fuel gas to produce coatings of the highest quality.

The mixture of gases that occurs inside the gun and the flame on the outside temperature reaches around 2700 ° C.

The combustion process melts a metal containing powder that is continuously fed the gun with carrier gas (argon) and drives at speeds approaching 550 meters per second at the surface of the workpiece to be coated.

Still, this temperature resulted in a lower average particle aerosol compared with p Lasma.

Despite this low average particle temperature, the density of coating achieved remain high through the speed of impact that deforms the particles are not well melted. Some heating of the particles can be produced on the impact that further aid in producing a dense layer.

Due to the high energy kinetics of the particles strike the substrate surface does not require that the particles become fully molten in order to form a coating High quality c eramic which means it can be advantageous for coatings of carbide cermet type. This is where the process really excels.

HVOF coatings are very dense, strong and show low residual tensile stress or, in some cases the compressive stress, allowing much thicker layers to be applied than previously possible with other processes.

HVOF coatings are used in applications requiring the highest density and strength not found in most thermal spray processes.

Metal powders are available in many compositions included WC / Co, WC / Co / Cr and Ni / Cr / Fe

Precise control of all parameters of the spraying, powder feed rates and use of a robot with precision the position of the gun, high quality coating allows metal and ceramic that is repeated in a variety of components different.

The properties of HVOF coatings depend on a number of parameters. These include surface preparation the piece, the composition, morphology, size and distribution of feed powder rated. We must also bear in mind is the precise control of gas flows, a torch on the motion of a party, stand-off angle of deposition and the temperature part.

What are the benefits of this type of coating?

A high bond strength (83 MPa – 12000 psi)

High-density, low porosity

Low oxide content

High hardness (DPH 500 1000 to 1300 for WC / Co)

Fine texture as sprayed, can be ground or lapped with a fine finish (0.1-0.2 micron)

Excellent resistance abrasive wear, erosion or Fretting

The only waste stream produced by HVOF is the capture of overspray. Current users use a curtain of water filter system or a dry, high-efficiency particulate air (HEPA).

Despite a process line of sight, you might get bored coat, the measure that was generally equal to the diameter of the cavity.

Added some cooling may be necessary where the geometry a small dish or thin

What are the main applications?

HVOF thermal spraying main applications include:

• Wear and abrasion resistance

· Recovery worn components

· Sheets Rotary knife

· Gate Valves

Pistons ·

Axes ·

· Domestic and chef's kitchen knives

About the Author:

Article written by Edward Brown BA(Hons), DipQ, MCQI CQP, who is the Quality Manager at Plasma Coatings Ltd (www.plasma-group.co.uk)

Article Source: ArticlesBase.com – Looking for a high-performance ceramic coating?