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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.
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.
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.
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.
Diopside-Anorthite계의 유전체 및 절연체에 관한 연구
안영필,정복환,김일기,이광,Ahn, Young-Pil,Chung, Bok-Hwan,Kim, il-Ki,Lee, Kwang 한국세라믹학회 1979 한국세라믹학회지 Vol.16 No.2
Diopside-Anorthite body was easily synthesized at relatively low temperature 1225℃, compared with the synthesizing temperature 1425℃ of Anorthite. Of Diopside-Anorthite body, the synthesizing temperature was considered to be higher than 1225℃ because Gehlenite, probably formed at 1220℃, was detected by X-ray diffraction. This body has excellent physical and electrical properties, i.e. electric resistivity (1.2×1014Ωcm), low dielectric constant (6.26) and low thermal expansion coeffcient (61.9×10-7/℃). It's hardness was good enough for electrical subsidiary. In addition, this body, Diopside-Anorthite, has exellent properties for heat resisting wares.
국산 천연원료를 사용한 규탄석-탄장석계 광물 합성에 관한 연구
안영필,정복환,김성일,최롱,Ahn, Young-Pil,Chung, Bok-Hwan,Kim, Seong-Il,Choi, Long 한국세라믹학회 1977 한국세라믹학회지 Vol.14 No.3
The synthesized wollastonite-anorthites by using Korean agalmatolite and limestone are studied. Batch compositions were prepared by the ratio of limestone 4 mole to agalmatolite 1 mole. Optimum temp. for the synthesis of wollastonite-anorthite was around $1,250^{\circ}C$.
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.
Barium-Ferrite 조직구조(組織構造)에 관(關)한 연구(硏究) (제2보(第二報))
안영필,오평제,김동수,도명기,Ahn, Young-Pil,Oh, Pyoung-Je,Kim, Dong-Soo,Doh, Myung-Ki 한국현미경학회 1972 Applied microscopy Vol.2 No.1
The Optimum Conditions of Preparing barium Ferrite from $BaCO_3$ and $Fe_2O_3$ are Sought for with electron microscope. At first to find the optimum sintering temperature, the mixture in 1 : 3 mole ratio. Sintered primarily at $700^{\circ}C$ for an hour, is Sintered secondary at $960^{\circ}C{\pm}10,\;1040^{\circ}C{\pm}10,\;1120^{\circ}C{\pm}10,\;1200^{\circ}C{\pm}10,\;1250^{\circ}C{\pm}10,\;1330^{\circ}C{\pm}10$, respectively for an hour. at the optimum temperature,abtained in this way. Sintering time is varied from 10 minutes to 120 minutes with 10 minutes intervals. Through the experiment, It is found that the optimum temperature of $1200{\sim}1250^{\circ}C$ and optimum time of half-one hour.
Barium Ferrite 조직구조(組織構造)에 관(關)한 연구(硏究)(제 1 보)(第 1 報)
안영필,이광,황보한,도명기,Ahn, Young-Pil,Lee, Kwang,WhangBo, Han,Doh, Myung-Ki 한국현미경학회 1969 Applied microscopy Vol.1 No.1
X-ray diffraction intensity of barium ferrite sintered at $1280^{\circ}C$ as first sintering, varing mole ratio of barium carbonate and iron (III) oxide was checked. The results corresponed to of that magnetic coercivity in previous peport. The microstructure and sintering condition were observed-by means of two step replica method without etching by electron microscope.