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황정길(Jeong Gil Hwang),김진오(Jin Oh Kim) 한국소음진동공학회 2016 한국소음진동공학회 학술대회논문집 Vol.2016 No.4
This paper deals with the transmission characteristics of an ultrasonic of an ultrasonic sensor in air according to the matching layer shape. Theoretically, ultrasonic transmissibility in air was calculated according to the cross-sectional shape of a matching layer. By the finite element method, mode frequencies were obtained and displacement responses were compared according to the matching layer shape. Matching layer samples were made of epoxy, and they were used to ultrasonic transmission test for comparison. Ultrasonic transmissibility difference was evaluate d depending on matching layer geometry, and the matching layer shape to improve the transmissibility of the ultrasonic sensor was identified.
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.
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.