China Building Materials Academy

Zhongzhou Yang

Hong Wang

Jing Liu

Zhiqiang Sun

The invention relates to a solar selective absorbing coating and a preparation method thereof. The solar selective absorbing coating comprises a substrate, an infrared reflective layer, an absorbing layer and an antireflective layer in sequence from bottom to surface. The absorbing layer consists of a first sublayer, a second sublayer and a third sublayer. The first sublayer and the second sublayer contain metal nitride, and the third sublayer is metal oxynitride. The first sublayer is in contact with the infrared reflective layer, and the third sublayer is in contact with the antireflective layer. The preparation method comprises: depositing an infrared reflective layer on a substrate; depositing an absorbing layer on the infrared reflective layer; and depositing the antireflective layer on the absorbing layer. According to the metal nitride (oxynitride) solar selective absorbing coating, the working temperature of the metal nitride (oxynitride) solar selective absorbing coating is increased, the preparation is simple, and the coating is suitable for large-scale production.

Solar selective absorbing coating and preparation method thereof

A spectrally selective solar absorbing coating includes a multilayer stack including, from the substrate to the air interface: substrate (), infrared reflective layer (), barrier layer (), composite absorbing layer () consisting of metal absorbing sublayer (), metal nitride absorbing sublayer (), and metal oxynitride absorbing sublayer (), and antireflective layer (). Therefore, the solar absorbing coating has good high and low temperature cycle stability and superior spectrum selectivity, with a steep transition zone between solar absorption and infrared reflection zones. It has a relatively high absorptance &#x3b1;&#x3e;95%, and a low thermal emissivity &#x3b5; &#x2264;4%, PC (performance criterion) =&#x2212;0.3. The solar absorbing multilayer stack can be obtained by reactively magnetron sputtering the metal target in argon or other inert gas with some amounts of gas containing oxygen or nitrogen or their combination.

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Beijing, China

Zhongzhou Yang