Byung‐Koog Jang

Abstract The Gd 2 SiO 5 performed high‐temperature corrosion behavior on calcium–magnesium– aluminosilicate (CMAS) for environmental barrier coatings (EBCs). The synthesized Gd 2 O 3 ‐SiO 2 powder was prepared to fabricate a sintered Gd 2 SiO 5 by spark plasma sintering (SPS) at 1400°C for 20 min. CMAS was sprinkled on the sintered Gd 2 SiO 5 surface and exposed for 2, 12, and 48 h at 1400°C by isothermal heat treatment. The main corrosion factor is Ca, and Ca 2 Gd 8 (SiO 4 ) 6 O 2 phase is form

Abstract Transparent Y 2 O 3 ceramics were successfully fabricated by spark plasma sintering applying a two‐step pressure and heating profile. Through the shrinkage curve of the single‐step SPS profile, it was confirmed that shrinkage occurred at 800°C–1250°C, and it was selected as the two‐step pressure profile. After the first‐step SPS stage at 1250°C, the second‐step SPS stage, which had the highest real in‐line transmittance, was completed at 1500°C. The two‐step SPS profile improved the shr

TiNi/CFRP composites were fabricated by hot-pressing in the temperature range of 130-180 degree(s)C, by controlling the applied pressure. The TiNi wires were embedded as an 1mm interval into the center of CFRP layers and CFRP host materials were stacked as 0, 30, 60 and 90 degrees configuration on tensile direction, respectively. The stress-strain curve and tensile strength of composites strongly depends on stacking direction of carbon fibers. The tensile strength of TiNi/CFRP composites with st

Stable Al 2 O 3 –SiC–YAG hybrid composites were successfully fabricated by reaction of Al 2 O 3 and Y 2 O 3 and incorporation of SiC. The hot‐pressed bodies consisted of uniformly dispersed grains of microsized YAG particulates and nanosized SiC particulates in an Al 2 O 3 matrix. Although the grain size of monolithic A1 2 O 3 increases markedly with increased temperature, the grain size of the Al 2 O 3 –SiC–YAG hybrid composites was effectively restrained due to grain‐boundary pinning by the pa

Al2O3/SiC composites were prepared by hot-pressing in order to investigate the microstructural characteristics and nano-disperse behavior of alumina matrix composites. The grain size of the monolithic alumina ceramics increased with increasing hot-pressing temperature, and the exaggerated grain growth occurred above 1800°C. However, the addition of SiC particulates effectively suppressed the growth of the alumina matrix in the composites. The average matrix grain size was smaller and the grain s

Many researches based on SOFC development and high temperature electrolysis (HTE) have been reported in the last couple of decades. HTE is one of the most clean and efficient technologies for manufacturing large amounts of hydrogen from water with oxygen. The processing and structure of HTE is closely related to the knowledge and concept of solid oxide fuel cells (SOFCs). Specially, it is very important to evaluate the durability’s properties of oxide electrolysis stacks under high temperature a