Cold thermal chemical vapor deposition coatings, articles, and processes are disclosed. Specifically, a cold thermal chemical vapor deposition process includes positioning an article, heating a precursor gas to at least a decomposition temperature of the precursor gas to produce a deposition gas, introducing the deposition gas to a coating vessel, and depositing a coating from the deposition gas onto the article within the coating vessel. The article remains at a temperature below the decomposition temperature throughout the introducing and depositing of the deposition gas. The coating on the article has a gradient formed by the depositing of the coating having no flow for a period of time. The coated article includes a thermally-sensitive substrate (the thermally-sensitive substrate capable of being modified by a temperature of 300 degrees Celsius) and a coating the thermally-sensitive substrate.