Polycrystalline ZrB₂coating prepared on graphite by chemical vapor deposition

Abstract

Polycrystalline ZrB 2 coating was prepared on graphite by chemical vapor deposition (CVD) using a gas mixture of ZrCl 4 , BCl 3 , H 2 , and Ar at 1200 8C. The microstructure and phase composition of the coating were investigated. The results indicated that the coating structure was loose. ZrO 2 and B 2 O 3 detected on the surface of ZrB 2 grains were formed by oxidation due to exposure to air. Some adsorbed oxygen, nitrogen, and water vapor was also detected on the surface of ZrB 2 grains. The feasibility of preparation of ZrB 2 on graphite by CVD using ZrCl 4 , BCl 3 , and H 2 was verified.

High-Temperature Oxidation-Resistant ZrN0.4B0.6/SiC Nanohybrid for Enhanced Microwave Absorption

“…Furthermore, high-resolution XPS analyses were also applied to confirm the chemical state of each element in the nanohybrid. As shown in Figure b, the B 1s XPS spectrum had two peaks at 190.3 and 190.7 eV corresponding to sp 2 -bonded B–N and sp 3 -bonded B–N, respectively, which explained the presence of ZrN 0.4 B 0.6 in the hybrid . The C 1s peak located at 284.9 eV is due to the C–C bond, demonstrating that there was a small amount of carbon in the hybrid.…”

“…As shown in Figure 5b, the B 1s XPS spectrum had two peaks at 190.3 and 190.7 eV corresponding to sp 2bonded B−N and sp 3 -bonded B−N, respectively, which explained the presence of ZrN 0.4 B 0.6 in the hybrid. 31 The C 1s peak located at 284.9 eV is due to the C−C bond, demonstrating that there was a small amount of carbon in the hybrid. Moreover, there was also a peak centered at 283.2 eV, indicating a certain content of SiC on the surface of the hybrid (Figure 5c).…”

Modulation Effect of Hardness on the Friction Coefficient and Its Mechanism Analysis of ZrB2/Mo Multilayers Synthesized by Magnetron Sputtering

“…Therefore, it is necessary to establish a method that can effectively improve the mechanical properties, high temperature resistance, and friction properties of the multilayer. Among many materials, ZrB 2 has the advantages of a high melting point, high hardness, low density, excellent corrosion resistance and oxidation resistance [10][11][12][13][14][15][16], and it is a promising ultra-high temperature ceramic material. Over the years, despite extensive research on the microstructure and mechanical properties of ZrB 2 [17,18], its application was still limited by its inherent brittleness, low fracture toughness, and unreliable high temperature performance [19,20].…”

Localized microreactor deposition of thin films and nanostructures as new approach to investigation of chemical vapor deposition

“…There are a large number of papers on the study of the compounds used in the manufacture of high-tech products (SiO 2 , Si 3 N 4 , TiO 2 , C, SiC, GaAs, Ni, etc.). Other substances are poorly investigated, and only about a dozen of papers are devoted on the deposition of some materials, such as ZrB 2 [3];…”