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T-LAYER® e TiN CVD
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Die casting moulds for metal, to endure temperature conditions, thermal changes, pressure and other external factors must be prepared with targeted treatments and may be classified into two categories:
• Massive treatments modifying the core properties of steel: annealing, stress relieving, hardening and tempering etc.
• Surface treatments modifying only the surface properties of a mould.
A surface thermo-chemical treatment modifies the characteristics of the steels (nitriding, casehardening, oxidation). A coating is the deposit of a different material on the surface (chromium plating, nickeling, PVD and CVD coatings).
is a PVD surface coating, performed by CRT Srl, used in all the processes when there is a contact between melted metal and mould steel. The basic component is zirconium nitride (ZrN) and it revealed to be the best wear coating when used with melted steel: its color is straw, it's 5 mm thick, it is applied on final items and does not need any further work. Its resistance to high temperatures (beyond 800°C) allows to use it also with high melting temperature.
TiN CVD coating has qualities similar to T-Layer®: deposited with CVD performance has a higher thickness (7-10 mm) and its color is golden yellow. As for T-Layer®, it is applied on final tools. The surface is rougher and needs to be polished before and after the treatment. The biggest problem is the high deposition temperature (ca. 1000°C) which requires a successive thermal treatment and a higher tolerance on deformations. |
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