Possible Impacts On Translucency And/or Colors


-Deviations in the energy effect on the zirconium oxide


· Final temperature too high or too low

o A deviation of the final temperature may lead to differences in the material structure. This has negative impacts on the translucency and the color indication.

· Extreme fluctuation of current

o The change in the energy effect may have the same impacts as described above.

· Wear of the heating elements


· Pollution of the heating chamber

o If coloring liquids are used in combination with low sintering temperatures the result may be a saturation within the insulation after several sintering cycles. This saturation may have influenced the workpieces during the sintering process in return.

Regular execution of the purging/regeneration program is strongly recommended <<

· Damaged heating elements

o If the oxide layer of the heating elements is damaged, this may result in pollution of the heating chamber leading to greenish discoloration.

Regular execution of the purging/regeneration program is strongly recommended <<

· Pollution of the sintering tools (bowls, beads)

o Please refer to the heating chamber

· Pollution of the workpiece

o If the workpiece is not cleaned carefully, this may lead to the inclusion of particles of dirt during the sintering process. This has a negative impact on translucency.

o Exhausted or polluted cooling liquid of the milling machines

Coloring liquid

· Age of the coloring liquid

o During the lifetime of the coloring liquids the proportion of the color particles within the coloring liquid changes.

· Degree of dilution of the coloring liquid

o If the coloring liquid is diluted too often, the proportion of the color particles decreases. The result is a deviation although the working process may be the same.

· Usage of unsuitable diluting agent

o Unsuitable diluting agents may damage the color particles within the liquid and lead to different results.

· Wrong storage of the coloring liquid

o Manufacturers’ storage instructions have absolutely to be observed.

Problems caused by the drying process

· Drying temperature is too high

o If the temperature is too high or the heating is too fast, this may lead to an increased vapor pressure within the workpiece and thus to a negative impact on the structure or/and the translucency/coloration.

· Drying time is too short

o If the drying time is too short, this may have the same consequences as a drying temperature that is too high.