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최롱,안영필,Choi, Long,Ahn, Young-Pil 한국세라믹학회 1981 한국세라믹학회지 Vol.18 No.4
Experimental investigation has been carried out to study the characteristics of the various grade limestones in Samtaesan formation with the fundamental test (mineral compostion, thermal decomposition and etc.) and intrinsic reactivity test. It was shown that belite formation in low grade limestones is faster than high grade limestone, but alite formation has a contrary.
삼태산층 석회석을 사용한 시멘트 조합원료의 소성성과 클린커 성질에 관한 연구
최롱,안영필,Choi, Long,Ahn, Young-Pil 한국세라믹학회 1982 한국세라믹학회지 Vol.19 No.1
It was found that the burnability of raw mix and characteristics of clinker was affected by the difference in grades of limestones. The thermal decomposition temperature of raw mix which used low grade limestone was lower than that of high grade, and the fast formation of $C_2S$ was due to the rich content of calcite and quartz over critical grain size, which caused the bad effects in the burnability, but $C_3S$ was formed slowly. The structure of clinker had many pores, and the growth of clinker minerals was inferior.
고 알루미나질 내화물 원료로서 연천산 홍주석의 이용에 관한 연구 (I) -홍주석의 산출상태 및 일반적특성-
안영필,최롱,Ahn, Young-Pil,Choi, Long 한국세라믹학회 1974 한국세라믹학회지 Vol.11 No.1
The andalusite that can be found in mica shist near YunChun deposits were studied by means of an optical microscope, X-ray diffraction, thermal analysis of DTA and TGA, chemical analysis and refractoriness test to find out an appropriate method of concentration and purification for the utilization as a raw material of high alumina refractories, with the results: 1. The andalusite are has chiefly contained andalusite, muscovite and biotitei in addition to small amounts of chlorite, kyanite, disapore, quartz, alumandite adn pyrite, which vary from sample to sample. 2. Most of andalusite have occurred as light-red colored columns which are estimated to be an average of 4 by 0.5m/m in length. 3. Samples of andalusite which were dressed by cobbing and hand picking in the deposits have contained an average of 42% andalusite.
고 알루미나질 내화물 원료로서 연천산 홍주석의 이용에 관한 연구(III) -홍주석의 물라이트화에 미치는 불순물의 영향-
안영필,최롱,Ahn, Young-Pil,Choi, Long 한국세라믹학회 1974 한국세라믹학회지 Vol.11 No.3
The effect of impurities of andalusite on the morphology of the crystallization of mullite was investigated. The raw, concentrated and purified andalusite were fired at 145$0^{\circ}C$. and 150$0^{\circ}C$. Each of three grades of andalusite was examined in a scanning electron microscope, X-ray diffractometer and etc. The raw andalusite showed deeply etched textures and prismatic crystals which are estimated to be an average of 2.5u in width and 15u in length. Concentrated andalusite showed poorly formed and elongated prismatic crystals. Purified andalusite showed condensed needle-like crystals which are estimated to be an average of 0.4$\mu$ in width and 2.0$\mu$ in length, but at the boundary of the original andalusite grain, prismatic crystals were seen. It is supposed that the purified andalusite is able to utilize as a raw material for high alumina refractories with refractoriness S.K. 38.
요업공업에 있어서 국산저질골석의 이용에 관한 연구 (투각섬석질 골석-슬라그-점토계)
안영필,최롱,황정길,Ahn, Young-Pil,Choi, Long,Hwang, Jung-Gil 한국세라믹학회 1977 한국세라믹학회지 Vol.14 No.1
In our former paper, tremolitic talc, -wollastonite-clay system was studied. In this study blast furnace slag was used(B.F.S.) instead of wollastonite for developing a fast-firing wall tile body. The wall tile bodies consisting of tremolitic talc and B.F.S. asmajor constituents have been fired in the temperature range 1000-120$0^{\circ}C$. Some of these bodies have showed good properties for wall tile manufacture. According to the increased content of B.F.S the fired bodies have showed the decreased thermal expansion which was resulted from the fact that the amounts of diopside and anorthite were gradually increased and those of quartz relatively decreased. Being reasonable in low price and thermo-stable properties tremolitic talc and B.F.S. will be good materials for the fast-firing tile body.
신속소성 벽타일 소지의 개발에 관한 연구(제1보 투각섬석질 골석일-규회석- 점토계)
안영필,최롱,황정길,김건국,Ahn, Young-Pil,Choi, Long,Hwang, Jung-Gil,Kim, Kurn-Kook 한국세라믹학회 1976 한국세라믹학회지 Vol.13 No.2
Korean tremoitic talc, wollastonite and clay have been used to develop a wall tile body to appropriate to the fast firing process. Some of ceramic properties of the raw materials were investigated by X-ray diffraction, thermal analysis and chemical analysis. The body compositions were formulated from the range of 35~75% tremolitic talc, 0~30% wollastonite and 25~35% plastic clay. Thermal gravity analysis and thermal expansion were tested for each of unfired bodies to study the correlation between thermal dehydration and linear shrinkage during the firing procedure. Linear shrinkage and water absorption of the fired bodies at the various temperature were taken as a measures for determining the proper firing range of the bodies. Increasing the content of wollastonite and firing temperature, the thermal expansion of the fired body showed the gradual decrease, and the thermal expansion curves showed a tendency to straighten. These observations may be resulted from the fact that the amounts of diopside and anorthite formed were gradually increased and those of quartz relatively decreased. The optimum compositions of the wall tile bodies for fast firing are 30% clay, 10~20% wollastonite and 50~60% tremolitic talc.
한국 석회석의 열분해특성 및 가열에 의한 상변화에 관한 연구
한기성,안기상,최롱,Han, Ki-Sung,Ahn, Ke-Sang,Choi, Long 한국세라믹학회 1983 한국세라믹학회지 Vol.20 No.1
The investigations have been carried out to study the characteristics of limestone using in Korean cement industry with prime interests in the dissociation and thermal phase changes of limestone between 90$0^{\circ}C$ and 140$0^{\circ}C$ The range of decomposition temperature of limestone was 840-87$0^{\circ}C$ and it was considered that the temperature was lowered by impurities in the limestone. The more the impurities and the finer the grain size of quartz in limestone the lower temperature was applied in forming $C_2S$ mineral the temperature of about 100$0^{\circ}C$. The major clinker minerals such as $C_3S$, $C_2S$, $C_3A$ and $C_4AF$ were formed in most of limestone when the firing temperature was up to 130$0^{\circ}C$.
투휘석-Devitrite계 복합용융체의 핵생성 및 결정성장의 최적화에 관한 연구
안영필,오봉인,최롱,Ahn, Young-Pil,Oh, Bong-Inn,Choi, Long 한국세라믹학회 1979 한국세라믹학회지 Vol.16 No.3
This study seeks to find optimum conditions for the heating schedule of the Diopside-Devitrite system, to find the amounts and the kinds of nucleus which effect the crystal growth and forming nucleus. Generally, crystallization in the glass depends on the number of nucleus growing in the internal system and the rate of crystal growth. In order to obtain homogeneous polystalline phae, Diopside as MgO source and $ZrO_2$.$P_2O_5$, $TiO_2$, NaF, $CaF_2$ as nucleating agents were added to the $Na_2O$.CaO.$6SiO_2$ glass. The results obtained were Summarized as follows. 1) Optimum Batch Composition of base glass is 76.82 wt.% $SiO_2$, 5.84 wt.% CaO, 4.54 wt.% MgO and 9.80 wt.% $Na_2O$. 2) Best heating schedule.140$0^{\circ}C$(Melting)coolinglongrightarrow95$0^{\circ}C$reheatinglongrightarrow$1100^{\circ}C$coolinglongrightarrowRoom Temp. 3) The optimum amounts of $ZrO_2$.$P_2O_5$, $TiO_2$ and $CaF_2$ are 3wt.% and that of NaF is 4 wt.% as a nucleating agents.
Clinochlore를 이용한 Cordierite 소지의 생성 및 성질에 미치는 $Al_2$O$_3$의 영향
안영필,황정길,최롱,Ahn, Young-Pil,Hwang, Jung-Gil,Choi, Long 한국세라믹학회 1975 한국세라믹학회지 Vol.12 No.4
Korean clinochlore, kaolin, pyrophillite and a technical grade of alumina have been used to investigate the effects of Al2O3 on the formation and properties of cordierite bodies. The body compositions were formulated from the proper proportions of the above raw materials to cover the range of composition from the point corresponding to the stoichiometric formula of cordierite, bythe consecutive increasment of 0.2mol. Al2O3, toward the apex of Al2O3 on the MgO-Al2O3-SiO2 triaxial diagram. Each of bodies was fired with the elevated temperatures from 110$0^{\circ}C$ to 140$0^{\circ}C$ by 5$0^{\circ}C$ interval. Linear shrinkage and water absorption were taken as measures for the firing range of the bodies. The formation of cordierite was estimated from the comparative study of X-ray diffraction and dilatometry of the fired bodies. The formation of a large amount of cordierite was initiated about 120$0^{\circ}C$. The content of Al2O3 exceeded up to 0.8 mol. comparing to the stoichiometric formula of cordierite broadens the firing range of the body.
열에 안정한 Ceramic Resistor의 제조에 관한 연구
안영필,김상욱,최롱,Ahn, Young-Pil,Kim, Sang-Wook,Choi, Long 한국세라믹학회 1975 한국세라믹학회지 Vol.12 No.2
Ceramic resistors to be stable at high temperature were manufactured from using MgO, SiO2, SnO2, Bi2O3, and CeO2 by sintering in air at 125$0^{\circ}C$. Electrical resistivity with elevated temperatures was studied for the various system of the above oxides. The resistor, 1.0 MgO-1.0 SiO2-0.575 SnO2-0.005 Sb2O3-0.025 Bi2O3-0.013 CeO2 has the resistivity, (14.55$\pm$0.3)$\times$103 ohm in a temperature range from $25^{\circ}C$. to 80$0^{\circ}C$. It is concluded that the ceramics prepared by a dielectric compound and metal oxide semi-conductor has a good thermostability for electrical appliciations.