Coated article
A coated article is described. The coated article includes a substrate, a combining layer formed on the substrate, a plurality of titanium dioxide layers and a plurality of copper-zinc alloy layers formed on the combining layer. The combining layer is a titanium layer. Each titanium dioxide layer interleaves with one copper-zinc alloy layer. A method for making the coated article is also described.
1. A coated article, comprising:
a substrate;
a combining layer formed on the substrate, the combining layer being a titanium layer; and
a plurality of alternating titanium dioxide and copper-zinc alloy layers formed on the combining layer.
2. The coated article as claimed in claim 1 , wherein one of the titanium dioxide layers is directly formed on the combining layer; one of the titanium dioxide layers forms an outermost layer of the coated article.
3. The coated article as claimed in claim 1 , wherein the substrate is made of titanium or titanium alloys.
4. The coated article as claimed in claim 1 , wherein each titanium dioxide layer is formed by vacuum sputtering and has a thickness of about 50 nm to about 100 nm.
5. The coated article as claimed in claim 1 , wherein each copper-zinc alloy layer is formed by vacuum sputtering and has a thickness of about 200 nm to about 300 nm.
6. The coated article as claimed in claim 1 , wherein the titanium dioxide layers and the copper-zinc alloy layers have a total thickness of about 1 μm to about 8 μm.
7. The coated article as claimed in claim 1 , wherein the combining layer is formed by vacuum sputtering and has a thickness of about 100 nm to about 200 nm.
8. The coated article as claimed in claim 2 , wherein the titanium dioxide layers have porous structure.
9. The coated article as claimed in claim 8 , wherein each copper-zinc alloy layer is sandwiched by each two titanium dioxide layers adjacent to the copper-zinc alloy layer, the each copper-zinc alloy layer has a portion that imbeds in the porous structure of the each two adjacent titanium dioxide layers.
10. The coated article as claimed in claim 1 , wherein total number of the titanium dioxide layers are 5 layers to 21 layers, and total number of the copper-zinc alloy layers are 4 layers to 20 layers.