LOW EMISSIVITY COATING WITH LOW SOLAR HEAT GAIN COEFFICIENT, ENHANCED CHEMICAL AND MECHANICAL PROPERTIES AND METHOD OF MAKING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a low-emissivity stack having a low solar heat gain coefficient (SHGC), enhanced aesthetics, mechanical and chemical durability, and a tolerance for tempering or heat strengthening, and to provide a method for depositing a coating onto a substrate.SOLUTION: A low-emissivity coating is provided which comprises, in order outward from a substrate: a first dielectric layer; a first nucleation layer; a first Ag layer; a first barrier layer; a second dielectric layer; a second nucleation layer; a second Ag layer; a second barrier layer; a third dielectric layer; and optionally, a topcoat layer. The coating does not contain an independent absorbing layer. In a method for low-emissivity coating, at least one of the first and the second absorbing barrier layers is not fully oxidized, the oxidation state of the absorbing barrier layer that is not fully oxidized is based on sputtering the layer using a ratio of oxygen flow to sputtering power (in kilowatts) that is from 7.5:1 to 8.0:1.