Laser Surface Treatment Of Ceramics

In this chapter laser surface treatment process parameters are described for the ceramic material systems used herein followed by an analysis of the surface finish material removal chemical composition k 1c and the distribution of surface temperature.

Laser surface treatment of ceramics.

Thermal treatment is based on the heat effect generated by medium long laser pulses and continuous laser interaction with the material surface which cause the ceramic surface material to melt and vaporize. The surface of compacts and ceramic specimens was subjected to laser treatment. Laser polishing technology can be roughly divided into the two categories i e thermal treatment and athermal treatment. In this chapter laser surface treatment process parameters are described for the ceramic material systems used herein followed by an analysis of the surface finish material removal chemical composition k 1c and the distribution of surface temperature.

Generally ceramic surfaces can be treated in the following manner to impart bondability. 2 roughening of the surface by grit or powder blasting. Laser surface melting of porous and dense compact al 2 o 3 ceramics was studied by using a wide range of laser power densities and different preheating temperatures. The radiation power p was 45 50 and 70 w.

The chosen modes of laser irradiation were as follows. Reduction of surface porosity in ceramic bodies by laser is studied. Alumina powder injection in the laser beam during the surface treatments leads to a composite surface which may solve most of the problems. Laser irradiation was performed in an 103 unit continuousltn action laser with λ 1064 nm.

This should lead to a better understanding of the laser beam ceramic interactions for. Surface treatments such as ion implantation ion beam mixing laser processing pvd cvd and laser alloying are being applied to monolithic ceramic materials to improve surface properties so that they can be used for more applications that they would otherwise be unsuited to. 3 acid etch usually using hydrofluoric hf or phosphoric h3po4 acids. This should lead to a better understanding of the laser beam ceramic interactions for.

Acknowledgments this work is part of a brite project on co2 laser surface treatment of bulk ceramics and ce ramic coatings supported by the commission of the european communities. Moving samples was carried out using a linear stepper motor. In spite of high mechanical strength zirconia based ceramics zro 2 has poor bond strength after conventional bond cementation procedures requiring different surface treatment methods stms. In the first one ceramic bodies are coated with a sodium and or potassium silicate.

Laser treatment consist in two stages.