• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2007.11a
• /
• pp.147-148
• /
• 2007

The compound, Ti3(Al,Si)C2, was synthesized by hot pressing a powder mixture of TiCX, Al and Si. Its oxidation at 900 and 1000 oC in air for up to 50 h resulted in the formation of rutile-TiO2, -Al2O3 and amorphous SiO2. During oxidation, Ti diffused outwards to form the outer TiO2 layer, and oxygen was transported inwards to form the inner mixed layer.

• Journal of Korean Society for Atmospheric Environment
• /
• v.14 no.3
• /
• pp.261-266
• /
• 1998

Recently, air pollution is increased according to increase of vehicle. So many countries are studying about DOC for diesel emission decrease. However, there are many difficulty in applying to DOC . In this study, SOx exhaust gas equipped with DOC was studied and we obtained several test results as following. First, in diesel oxidation catalyst, additives such as Pt is very effective for 503 and sulfate. Second, the oxidative activity for 502 has decreased to add such as Pt and the decrease of 502 is effect for the reduction of PM in high temperature . And finally, in high temperature, concentration of SOx is increased and temperature is affected by process from SOB to 503, whereas engine performance and fuel consumption are not affected by equipped DOC.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.14 no.1
• /
• pp.183-190
• /
• 2006

For continuously regenerative PM collecting system which adopted thermally stable SiC DPF and electrical heater which was placed upstream of the filter and driven by well constructed control logic, PM oxidation characteristics were investigated varying air flow rate, amounts of PM accumulated on the DPF and filter inlet temperature in order to get optimized PM regeneration performance. This study showed that the operating condition of air flow rate 70 lpm, high PM loading around 30g and filter inlet temperature $700^{\circ}C$ with heat insulation was effective in achieving high regeneration efficiency. Also, in this condition, we could decrease the electric energy consumption by reducing the regeneration time.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.23 no.2
• /
• pp.238-243
• /
• 1994

Changes of lipid components in modified oleoresin during cooking at high temperature were investigated. In preparation of the modified oleoresin, dried red pepper was milled to 100 mesh of size particle and extracted oily compounds by reduced pressure steam distillation . The rest part was reextracted and concentrated and concentrated. The extracts were combined. The same volume of water and 4% of polyglycerol condensed ricinoleate (PGDR) were added to the combined extract, and emulsified to make oleresin red pepper. Non-polar lipid components were quantified 3 times higher in the oleoresin than polar lipid components . The components of non-polar lipd was mainly triglyceride comprising 75.8%. The level of phosphatidyl choline and phosphatidyl ethanolamine were 38.6and 26.1%, respectively. linoleic acid was distinctively abundant (63.1%) and followed by palmitic acid, oleic acid, linolenic acid and stearic acid in the oleoresin. Oxidation of lipid at high temperature was principally affected by temperature rather than oxygen existence . With the result of oxidation , palmitic acid and myristic acid increased, however, oleic acid, linoleic acid, and linolenic acid decreased.

• Journal of the Korean institute of surface engineering
• /
• v.39 no.4
• /
• pp.173-178
• /
• 2006

Incoloy alloy 909 is an Fe-Ni-Co based superalloy that is attractive for gas turbine engine applications. The absence of chromium, however, makes the alloy more susceptible to oxidation in high temperature. To improve the oxidation resistance aluminizing was performed by high activity low temperature pack cementation process. Aluminizing condition was examined with different times and temperatures. Optimum aluminizing conditions were at the temperature of $552^{\circ}C$ for 20 hrs. In the optimized condition, the thickness of the aluminized layer was about $20{\mu}m$. Also, the aluminized layer made the alloy to increase the resistance to the corrosion.

• Journal of the Korean Society for Heat Treatment
• /
• v.34 no.1
• /
• pp.10-16
• /
• 2021

Exhaust manifold is a very important component that is directly connected to air environment pollution and that requires strict mechanical properties such as high temperature fatigue and oxidation. Among stainless steels, the ferritic stainless steel with body-centered cubic structure shows excellent resistance of stress-corrosion cracking, ferromagnetic at room temperature, very excellent cold workability and may not be enhanced by heat treatment. The microstructural characteristics of four cast ferritic stainless steels which are high heat-resistant materials, were analyzed. By comparing and evaluating the mechanical properties at room temperature and high temperature in a range of 400℃~800℃, a database was established to control and predict the required properties and the mechanical properties of the final product. The precipitates of cast ferritic stainless steels were analyzed and the high-temperature deformation characteristics were evaluated by comparative analysis of hardness and tensile characteristics of four steels at room temperature and from 400℃ to 800℃.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2002.05a
• /
• pp.77-77
• /
• 2002

• Proceedings of the Korean Institute of Surface Engineering Conference
• /
• 2000.05a
• /
• pp.45-46
• /
• 2000

• Proceedings of the Korean Nuclear Society Conference
• /
• 2001.05a
• /
• pp.312.2-312
• /
• 2001

• Proceedings of the Korean Nuclear Society Conference
• /
• 2003.05a
• /
• pp.235-235
• /
• 2003