High-temperature coating materials

Recombination of Oxygen and Nitrogen Atoms on Silica and High-Temperature Coating Materials... 

Haynes J A, Pint B A, Porter W D and Wright I G (2004), Comparison of Thermal Expansion and Oxidation Behavior of Various High-Temperature Coating Materials and Superalloys, Mater High Temp, 21, 87-94. 

Monomeric vinylic metal n complexes undergo polymerisation reactions to form polymers that have limited applications because of their poor thermo-mechanical properties but they absorb UV without degrading in the process. Such polymers can be used as a UV-resistant coating and act as catalysts in other monomer reactions. Metallocene methylene polymers are high temperature resistant materials and have uses as ablative materials for space capsule heat shields. These materials use Fe and Ru in their metal polymers. 

Use High-temperature coatings, laminates and composites for aerospace vehicles, ablative materials, oil sealants and retainers, adhesives, semiconductors, valve seats, bearings, insulation for cables, printed circuits, magnetic tapes (high- and low-tem-perature-resistant), flame-resistant fibers, binders in abrasive wheels. 

National Research Council. 1996. Coatings for high-temperature structural materials trends and opportunities. National Materials Advisory Board. Washington, D.C. National Academy Press. 

R. S. Hay, M. D. Petty, K. A. Keller, M. K. Cirtibrrlk, and J. R. Welch, Carbon and Oxide Coatings on Continuous Ceramic Fibers, in Ceramic Matrix Composites-Advanced High Temperature Structural Materials, R. A. Lowden, et al., Eds., Materials Research Society (1995). p. 377 382. 

The micro fuel element, shown in Fig. X-8, was developed for the conditions of fuel operation in a light water cooled and moderated core. It appears as a sphere of 1.8 mm outer diameter and includes the uranium dioxide kernel and a three-layer coating made of high-temperature ceramic materials. The kernel has a diameter of 1.4 mm. The first coating layer is made of porous pyrolythic graphite (PyC) it has a density of 1 g/cm. The thickness of this layer is 100 mkm. The second layer is made of dense PyC (the density is about 1.8 g/cm ) and is 5 mkm thick. The third, outer layer is made of silicon carbide (SiC) and has the thickness of about 95 mkm. 

Titania- and zirconia-based materials have been used for high-temperature HPLC applications, due to their high stability at high temperatures, coated with phosphates to reduce the strong Lewis acid properties (Figure 3.15). 

A commercial application has been reported by Volkswagen for some EU6 vehicle applications of their new 1.6 and 2.0 1 TDI engines [72]. The system comprises a close coupled DOC followed in short distance by an SCR catalyst coated DPF. In addition, a slip catalyst with combined SCR and oxidation functionality is installed downstream of the DPF. The urea injection is located in-between the DOC and DPF components and a static mixer is used to improve distribution and evaporation within the limited space. Due to the high temperatures that can occur in this very close coupled position, a water-cooled urea injector was selected and the supply lines for the aqueous urea solution are made of highly temperature resistant materials. 

The presentations also outlined certain enabling technologies that may be common for several different reactor lines. For example, coated particle or pebble bed type fuel is considered for use not only in high temperature gas cooled reactors, such as PBMR and HTR-PM, but also in several innovative water cooled, molten salt cooled, and even lead-bismuth cooled SMRs, such as PFPWR50 (Japan), VKR-MT (Russia), perhaps FBNR (Brazil), MARS (Russia), and CHTR (India). Some projections for the advanced high temperature structural materials of... 

Novak, R. C (1994), Coating Development and Use Case Studies, Presentation to the Committee on Coatings for High-Temperature Structural Materials, National Materials Advisory Board, National Research Council, Irvine, CA, April 18-19. 

These products, known by the initials PTFE, PCTFE and FEP, combine low friction characteristics with exceptional resistance to chemicals, good electrical insulation properties and resistance to high temperatures. These materials are relatively costly and difficult to process but they have an important place in high duty applications and, nearer home, as non-stick coatings. All are extremely tough and durable. 

Gao, W., Li, Z. Nanostructured alloy and composite coatings for high temperature applications . Materials Research, 2004, 7,175-82. 

Inconel alloys (IN738) have a wide range of applications in industries as high temperature structural materials. Further, different surface treatments and coatings have been developed... 

Zhou X, Xu Z, Fan X, Zhao S, Cao X, He L. Y4AI2O9 ceramics as a novel thermal barrier coating material for high-temperature applications. Materials Letters. 2014 134 146-148. 

---