The effect of dispersion strengthening is effective at high temperatures whereas precipitation strengthening from heat treatments are typically limited to temperatures much lower than the melting temperature of the material.
Dispersion strengthening ceramics.
The copper matrix composites hereinafter called cmcs are usually prepared by the addition of fine dispersed ceramic particles to the copper matrix.
Due to their prominent properties mechanical stiffness strength thermal stability ceramic composite materials cmc have been widely applied in automotive industrial and aerospace engineering as well as in biomedical and electronic devices.
Because monolithic ceramics exhibit brittle behaviour and low electrical conductivity cmcs have been greatly improved in the last decade.
Pfm system fusing the porcelain to an oxide coated metal provides rigid support against propagation of ceramic surface cracks when exposing to tensile stresses the currently used metal ceramic systems.
Reduction of tensile stresses metal tooth advanced ceramic core dispersion strengthening bonding to 12.
Production of prestressed surface layers in dental porcelain via ion exchange thermal tempering.
The approaches in strengthening ceramics are as follows.
Dispersion strengthening of glasses 4.
Enamelling of high strength crystalline ceramics 5.
Moderate strengthening of dental ceramics can be achieved with appropriate fillers added and uniformly dispersed throughout the glass.
Therefore difficulty in the cooling rate control is one of disadvantages of thermal strengthening method.
In amorphous materials such as polymers amorphous ceramics glass and amorphous metals.
Request pdf dispersion strengthened glass matrices glass ceramics a case in point previous explanations of strengthening of glass ceramics after heat treatment to produce crystallization are.
Ceramics such as those based on zirconia are likely to undergo phase transformation in particular the yttria stabilized zirconia which is associated with strengthening of the material.
Explanations relating strength enhancement in brittle material systems either to flaw size limitation by interparticle spacing or.
Controlled crystallization of glasses 6.
Previous explanations of strengthening of glass ceramics after heat treatment to produce crystallization are discussed.
