• Journal of Powder Materials
• /
• v.9 no.5
• /
• pp.322-328
• /
• 2002

Fe-Co nanocomposite powders with different composition were prepared by chemical vapor condensation (CVC) process and their characterizations were studied by means of X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. The particles having the mean size of 5~25 nm consisted of metallic cores and oxide shells. The Co contents and particle size increased with increasing the carrier gas flow rate of Co precursor. The saturation magnetization and coercivity increased with increasing Co content. and the saturation magnetization maximized at the 40 wt.%Co. The Fe-Co nanocomposite powder oxidized at $400^{\circ}C$ showed the maximum coercivity of 1739 Oe.

• Journal of The Korean Society of Agricultural Engineers
• /
• v.50 no.2
• /
• pp.27-34
• /
• 2008

Recently, owing to the development of industry and improvement of building techniques, concrete structures are becoming larger and higher. This study was performed to analyze hydration reation properties of concrete with binders and admixtures, such as OPC, low heat cement, belite rich cement, slag powder, lime powder and fly ash. To investigate effects of PC type superplasticizer on the hydration, experiments involving FT-IR, XRD, DSC, SEM were analyzed at the curing age 1day, 3days and 28days. The hydration reaction rate of OPC concrete slightly delayed at the curing age 1day, blast furnace slag powder and fly ash were more effective. BRC and LHC concretes can be used for concrete structures in winter season.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2014.05a
• /
• pp.278-279
• /
• 2014

This study was performed an evaluation of mechanical properties of reactive powder concrete using copper slag. So, various RPC containing copper slag were made by replacement ratio of copper slag and different the curing condition and their mechanical properties were investigated. From the experimental results, slump flow using copper slag tends to increase with replacement ratio. And also, 30% of copper slag with quartz sand was found to have a compressive strength superior to that of plain.

• Journal of Powder Materials
• /
• v.14 no.6
• /
• pp.405-409
• /
• 2007

The Cu-based bulk metallic glass (BMG) composites containing Zr-based metallic glass phase have been consolidated by spark plasma sintering using the mixture of Cu-based and Zr-based metallic glass powders in their overlapped supercooled liquid region. The Zr-based metallic glass phases are well distributed homogeneously in the Cu-based metallic glass matrix after consolidation process. The successful consolidation of BMG composites with dual amorphous phases was corresponding to the sound viscous flow of the two kinds of metallic glass powders in their overlapped supercooled liquid region.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2016.05a
• /
• pp.139-140
• /
• 2016

In this research, the possibility of wasted refractory aggregate pulverized from refractory block as an expansive admixture and additional alkaline stimulant for class two and three blast furnace slag cements (BSC) was assessed with its high content of free CaO or free MgO. As the replacement ratios of wasted refractory powder and blast furnace slag were increased, flow and air content were decreased, while unit volume weight was increased under same conditions. Compressive strength of mortar was increased with increased replacement ratio of wasted refractory powder, especially, in the case of class three BSC, the highest compressive strength was obtained when wasted refractory aggregate was replaced 2%.

• Proceedings of the Korean Powder Metallurgy Institute Conference
• /
• 2006.09b
• /
• pp.702-703
• /
• 2006

The particle size distribution and shape are among the important parameters for characterisation of quality of metal powders. Specific material properties such as ability to flow, reactivity as well as compressibility and its hardening potentials hence the most important characteristics of sintered metals - are determined by the size distribution and shape. The correct particle size distribution and particle shape information are the key to best product quality in atomisation processes of aluminium, milling of pure metals and other processes. This paper presents state-of-the-art technology for characterization of particle size distribution and shape.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2007.11a
• /
• pp.41-44
• /
• 2007

Recently, the strenuous industrial waste is scattered and one of the oyster also make the serious environmental contamination. The purpose of this study is investigating an utilization ability as calcium binder of the oyster with Hwang-To according to a rate(10%, 20%, 30%, 40%, 50%). This study grasp physical properties of the oyster powder, bake production of the paste, and conduct the flow test, stiff time test and strength test. According to baking condition, strength of $1000^{\circ}C$(120minutes, rate 30%) is higher than any other condition. The oyster powder from above $900^{\circ}C$ seem possibility as binder hereafter. It is thought that the continuous research will be necessary.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2022.11a
• /
• pp.255-256
• /
• 2022

As part of a study to alleviate problems caused by cracks in concrete structures, this study compares and analyzes the fluidity and strength characteristics of mortars used by adjusting the mixing ratio of two types of PCC(Powder Compacted Capsule) manufactured by different methods.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2021.05a
• /
• pp.78-79
• /
• 2021

This study compared and analyzed the fluidity and compressive strength characteristics of mortar using ferronikel slag powder and mixed slag fine aggregate as part of the study to reduce environmental load and increase recycling rate of industrial by-products.

• Journal of the Korean Chemical Society
• /
• v.57 no.1
• /
• pp.159-164
• /
• 2013