ISO 23458 discusses standards for CVD ceramic coatings. ISO 23458 specifies a test method for determining thermal expansion coefficient up to 2 300 K and the residual stress of chemical vapour deposition (CVD) ceramic coatings (thickness > 0,03 mm) at room temperature. Procedures for test piece preparation, test modes, heat rate, data collection, property calculations and reporting procedures are given.
ISO 23458 applies to CVD ceramic coatings on metal or ceramic substrates. This test method can be used for material research, quality control, characterization and design data-generation purposes.
ISO 23458 on fine ceramics is useful for:
A Chemical vapour deposition (CVD) coating is a material applied to a surface of the metal by a method called chemical vapour deposition. Selecting the right coating for the application is important and coating quality control including surface preparation, process control, coating precursor, and material substrate quality plays a major role in the coating quality.
ISO 23458 provides you with test procedure for evaluating thermal expansion coefficient of CVD ceramic coatings. The residual stress of CVD ceramic coatings is usually generated due to the mismatch of thermal expansion coefficient between the coating and the substrate. Following test results, you will be able to ensure good quality of CVD ceramic coatings. . These customers will be able to safely use the ceramic coatings.
ISO 23458 gives guidance on the geometrical dimensions of the coated test piece for the thermal expansion coefficient tests. It is recommended that a cylinder testing piece be used for testing the thermal expansion coefficient. Using dimensional measuring devices, you will be able to calculate coating thickness with better measurement accuracy.
ISO 23458