• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.41-44
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• 2014

This study focused on the effect of the biomass blended ratio on air-staged pulverized coal furnace. The hybrid NOx reduction technology between fuel blending and air staging has been applied in an air-staged pulverized coal fired furnace. The results indicated that co-firing biomass with coal could reduce NOx emissions in an air-staged combustion. In addition, carbon burnout and flame temperature increased under the air-staged condition. A dominant synergistic effect on NOx reduction and carbon burnout was observed when biomass co-firing with coal was applied in air staged combustion.

• 한국연소학회:학술대회논문집
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• 2001.11a
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• pp.1-7
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• 2001

FGR is one of the most widely used methods of NOx reduction in the combustion process. It was investigated the effect of FGR, excess air ratio, peak temperature and firing rate on NOx emission in this study. 100kW burner and LNG were adopted in this experiment. NOx emission was notably decreased with the increase of FGR, however CO emission was also drastically increased in the 25% FGR. And excess air ratio, peak temperature and firing rate did not affect the NOx emission appreciably in the normal operating condition.

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.375-376
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• 2009

This study aims to provide basic material of concrete in replacement of non firing Hwang-toh, a traditional construction material in order to reduce CO$_2$ produced during manufacturing due to effectuation of the current Kyoto Protocol.

• Journal of the Korean Ceramic Society
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• v.37 no.10
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• pp.994-1000
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• 2000

Mn-Ni-Co계 스피넬을 모재로 선택하여 상업용 페라이트 등 다양한 종류의 Fe-스피넬과 동시 소결 가능성을 검토할 목적으로 각 소재의 소결 거동, 서미스터와의 계면 반응이나, 2차상의 형성 등에 대해 알아보았다. 대부분의 페라이트 조성이 Mn 스피넬과 새로운 2차상을 형성하지는 않는 것을 알 수 있었다. 상업용 페라이트의 경우 115$0^{\circ}C$ 소결 온도에서 접합이 가능한 조성은 다량의 액상이 존재하며 접합계면의 폭이 상대적으로 넓으므로 서미스터 특성에도 좋지 않은 영향을 줄 수 있을 것으로 생각된다. 반면에 MFN1과 MFN2 조성은 접합계면에서 새로운 2차상이 형성되지 않고 원소의 상호확산도 작아 NTC 서미스터의 동시소결용 보호재로서의 가능성이 높은 것으로 확인되었다.

• Proceedings of the Materials Research Society of Korea Conference
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• 2012.05a
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• pp.82.2-82.2
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• 2012

캐패시터, 액추에이터와 같이 MIM (Metal-Insulator-Metal) 구조를 갖는 디바이스는 높은 소결온도를 갖는 세라믹 유전체/압전체와 고온 내산화성이 낮은 금속 전극의 적층 형태로 인하여 동시 열처리 공정에 있어서 많은 제약이 따른다. 본 연구에서는 소결온도를 대폭 낮춘 저온 소결용 PZT 압전체 테이프를 니켈 금속 포일에 적층하여 동시 열처리를 통하여 소결을 시도하였다. 동시 열처리된 MIM 디바이스의 세라믹과 금속 전극 계면의 미세구조 및 성분 분석을 통하여 계면 반응 기구를 확인하였고, 계면 반응층이 디바이스의 특성에 미치는 영향에 대한 정량적 분석을 수행하였다. 또한 열처리 시간에 따른 계면 반응층의 변화를 관찰하고 반응층의 변화가 특성에 미치는 영향을 분석하였다. 니켈 이외에 니켈 합금인 INCONEL 718과 PZT 세라믹과의 동시 소성을 시도하여 니켈, INCONEL 두 금속 기판과 PZT 사이에 생성되는 계면 반응층의 미세구조와 특성의 차이점을 비교하였고 디바이스로서 사용하기 위한 적합성 여부를 확인하였다.

• Journal of the Korean Ceramic Society
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• v.27 no.6
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• pp.755-762
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• 1990

The tungsten paste was printed on the surface of 92% alumina sheet which was made by type casting process. The printed tungsten was bonded on the Al2O3 by co-firing in reducing atmosphere. During the co-firing, the binder burn-out was easier in wet H2 atmosphere than in dry H2, which affected sintered density. In practically, the use of wet H2 above 100$0^{\circ}C$ was beneficial for density of alumina and bond strength. This phenomena occured more distinctly when atmosphere varied from dry H2 to wet H2 than varied dew point in wet H2. In wet H2, the improvement in bonding strength can be attributed to good glass migration into the metal layer due to inhibition of the tungsten particle growth, with increase of alumina density, at the temperatrue higher than 100$0^{\circ}C$.

• Journal of Ceramic Processing Research
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• v.13 no.spc2
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• pp.282-285
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• 2012

Lead-free (Bi0.5Na0.41K0.09)TiO3 (BNKT) multilayer ceramic actuators were prepared using tape-casting and screen-printing techniques. Co-firing behavior of BNKT/AgPd laminates was examined as a function of sintering temperature. It was found that co-firing induced bending and electrical properties were very sensitive to sintering condition. By optimizing sintering conditions, lead-free electrostrictive multilayer actuators with normalized strain Smax/Emax of 266 pm/V have been successfully fabricated, which is promising for lead-free actuator applications.

• The Journal of Korean Academy of Prosthodontics
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• v.29 no.3
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• pp.111-119
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• 1991

This study was performed to investigate the effect of gold electrodepositoin on porcelain color of palladium-silver alloy. The specimens were made by firing porcelain on the metal plates cast respectively in Au-Pt alloy, and Pd-Ag alloy. In the case of Pd-Ag alloy specimens, porcelain were fired under three different conditions of the metal plate: 1) without gold coating, 2) firing opaque beforehand on one side, gold coating on the other side, 3) gold coating on both sides of the metal plate. Color change was measured with fiber-optic colorimeter(Model TC-6FX, Tokyo Denshoku Co., Japan). The obtained results were as follows: 1. In the group of firing opaque beforehand on one side and gold coating on the other side, there was no significant differences in their color in comparison to the color of the control group of the Au-Pt alloys. 2. In the group of gold coating on both sides on metal plate, there were no significant differences except their value to the group of firing poaque beforehand on one side and gold coating on the other side.

• Journal of Hydrogen and New Energy
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• v.31 no.4
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• pp.380-386
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• 2020

This paper represents an analysis of the economic impact of firing natural gas/diesel and natural gas/by-product oil mixtures in diesel engine power plants. The objects of analysis is a power plant with electricity generation capacity (300 kW). Using performance data of original diesel engines, the fuel consumption characteristics of the duel fuel engines were simulated. Then, economic assessment was carried out using the performance data and the net present value method. A special focus was given to the evaluation of fuel cost saving when firing natural gas/diesel and natural gas/by-product oil mixtures instead of the pure diesel firing case. Analyses were performed by assuming fuel price changes in the market as well as by using current prices. The analysis results showed that co-firing of natural gas/diesel and natural gas/by-product oil would provide considerable fuel cost saving, leading to meaningful economic benefits.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.384-387
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• 2008

We have studied the adsorption of contaminations on the MgO protective layer by Thermal Desorption Spectrometry (TDS). The result shows that the increase in exposure time, MgO thickness and humidity multiply the quantity of adsorbed contaminations. It is also found that the desorption activation energy and contamination quantity is decreased by the additional firing process of MgO layer under oxygen environment.