DD276857A1 - METHOD FOR PRODUCING RESISTANT GOLD-COLORED DECORS - Google Patents

Abstract

The invention relates to a method for producing mechanically resistant gold-colored decors on products made of glass or ceramic. Accordingly, the field of application is, in particular, the glass and ceramic industry. It was the object of the invention to apply to a gold-colored titanium nitride decor to improve the optical properties of a thin, well-adhering, abrasion and corrosion-resistant gold layer with minimal gold expenditure. For this purpose, according to the invention, a TiN layer is applied in a manner known per se to the glass or ceramic article to be decorated by reactive sputtering. Subsequently, a 20 to 80 nm thick titanium layer is sputtered onto this and then a 30 to 80 nm thick gold layer is evaporated on top of the TiN / Ti layer combination. Finally, a TiN cover layer of 10 to 100 nm thickness follows on the gold layer by means of reactive sputtering.

Description

Field of application of the invention

The invention relates to a method for producing mechanically resistant gold-colored decors on products made of glass or ceramic. Accordingly, the field of application is, in particular, the glass and ceramic industry.

Characteristic of the known technical solutions

Gold-colored decors on glass or ceramics are used on a wide scale for the artistic aesthetic design of utility and decorative objects as well as for the design of social buildings in the form of gold mosaics.

So far, only gold in the form of malt or gold leaf or fire gilding has been used. Recently, a number of methods have been known in which gold-colored decors and titanium nitride (TiN) coating are vacuum-formed via a reactive sputtering process. The applied TiN layers are adherent, corrosion resistant and mechanically very resistant to abrasion and the like. One can therefore, for example, In the case of glass mosaics, refrain from the otherwise usual sealing of the gold leaf overlays with a cover glass. The disadvantage over gold in TiN decors is the significantly higher proportion of green in the reflected light, which leads to the formation of black haze at low incidence of light. The brightness and brilliance of the Goldef are not given in the TiN. This often leads to a "tipping over" of the intended artistic concern, especially in the design of wall surfaces in the interior of buildings with glass mosaics.

In order to increase the proportion of red in the reflected light and to improve the brilliance of the TiN layer, DE-PS 3425467 supplies carbon in the form of C 1 - to Ce-hydrocarbons to the reaction gas in the sputtering process. The same purpose is the introduction of gold-containing halohydrocarbon phosphines in the reaction gas towards the end of the coating (DE-PS 3425468). Here, gold is increasingly being incorporated into the TiN layer in the immediate surfaces. However, both methods fail to sufficiently suppress black fogging. In addition, the use of toxic phosphines requires extensive cost-intensive safety technology. Another way to introduce gold into the TiN layer to improve color properties is by adding gold to the sputtering target (introducing metallic gold islands into the titanium target, using titanium-gold alloys as a target). Thus, a certain amount of gold is incorporated in the entire TiN layer. This also counteracts the black-fog tendency only insufficiently.

The most effective way is to vaporize a thin layer of gold on the TiN. It has already been proposed. Gold on a TiN layer with dendritic structure to evaporate thormisch.

The surface receives the optical properties of pure gold, but the cost of pure gold is significantly reduced compared to gold leaf. However, the lack of adhesion of the thin gold layer on the TiN in the event of deviations from the dendrite structure and the low abrasion resistance of the superficial gold layer are problematic.

Object of the invention

The aim of the invention is to produce gold-colored decorations with high abrasion resistance and high corrosion resistance with minimal gold use.

Essence of the invention

Dor invention is based on the object to apply to a gold-colored decor based on titanium nitride to improve the optical properties oine thin guthaftondo abrasion and corrosion resistant gold layer with minimal gold consumption. Dio object is orfindungsgomäß solved by applying first a thorough cleaning on the 'object of gold or ceramic to be decorated in a known manner by reactive sputtering a TiN layer. Subsequently, a 20 to 80 nm thick titanium layer is sputtered onto this TiN layer, which effects an improvement in the adhesion of the subsequently applied gold layer. On the layer combination TiN / Ti is then deposited at temperatures between 100 and 250 ° C oino 30 to 80 nm thick gold layer. To improve the abrasion resistance and corrosion resistance

on the gold schichlite still a cover layer of 10 to 100 nm TiN by reactive sputtering on. This TiN protective layer protects the gold layer against mechanical damage and is itself not optically active. Color brightness and purity of the gold are largely retained.

Ausführungsbeispieb

The invention will be explained in more detail by the following Ausfuhrungsboispiele, wherein the invention is not limited to these examples.

example 1

A stemmed glass of commercial glass was carefully cleaned and dried. After that, it was introduced into the recipient of the sputtering device. In the recipient, the glass was heated at a pressure of about 10 ^"3 Pa to 15O ⁰ C and coated at this temperature with about 1,5μιτι TiN. The coating was performed in the usual manner by reactive sputtering of titanium by magnetron in a defined nitrogen atmosphere Thereafter. About 40 nm of Ti were split on top of the TiN layer, and after switching off the magnetron and pumping out the recipient to < 10 ^-3 Pa, 50 nm of gold were evaporated at the same temperature. Subsequently, again by means of Msghetron sputtering 30nm TiN were deposited on the gold layer. After cooling, the glass was discharged from the recipient. The optical quality of the generated gold decoration in terms of color, brightness and brilliance was the same as that of gold leaf decors. The golden layer was dishwasher safe.

Example 2

A sheet glass with the dimensions 130 χ 70 χ 3mm was cleaned as described in Example 1 and coated with TiN. Again, a 40 nm thick Ti layer was sputtered onto the TiN layer. In this case, in contrast to Example 1, the temperature was increased continuously. The upper limit temperature 190 ° C were set. After reaching this target temperature and at a working pressure of <10 " ³ Pa in the recipient, 40 nm of gold were vapor-deposited on top of this gold layer, while maintaining the target temperature of IdO ⁰ C. Another layer of iiN of thickness 35 nm was applied by sputtering Glass mosaics were produced, which in their optical properties gold gold leaf based on the same gold leaf and could be processed without abrasion of the gold layer.

Example 3

A ceramic wall tile was treated as described in Example 2. The tile showed a gold shiny surface after being discharged from the vacuum chamber. It could be cut, processed and grouted without loss of quality.

Claims (2)

} claims: 1. A process for producing resistant gold-colored decors on objects made of glass or ceramic based on titanium nitride, characterized in that on a well-known manner by reactive sputtering in a vacuum deposited TiN layer, first a 20 to 80nm thick titanium layer at temperatures between 150 and 250 ⁰ C sputtered on this layer combination is then deposited in the same temperature interval, a gold layer of 30 to 80nm thickness and then again by reactive sputtering a 20 to 100nm thick TiN layer is deposited, the substrate temperature kept constant during the entire process or after a predetermined temperature regime is varied. 2. The method according to item 1, characterized in that the substrate temperature continuously increased up to an upper limit, preferably 190 ⁰ C, v.'ird.