SiO_2-R_2O_3-ZnO-LiO_2系 유리의 結晶化에 關한 硏究

梁重植 慶熙大學校 1982 論文集 Vol.11 No.-

A reseach was made to produce the crystallised glass by heat treatment of glass bodies with the composition of 3.85% Li₂O, 1.92% K₂O, 5.77% ZnO, 9.62% AI₂O₃, 8.65% B₂O₃, 3.85% Tio₂, 66.54% SiO₂. The crystallisation was occurred crystallisation temperature range accompanging low expansion and good whiteness, and shape deformation was examined in various heat treatment temperature range and a period of crystal growth. For evaluation of the crystallised glasses, crystalline phase, thermal behavious, modulus of rupture and whitness changes were investigated. The results are summerized as follows. 1) The optimum temperature and heat treating time for crystallisation was at 670℃ for 2hrs. 2) The thermal expansion of the crystallised body heat treated under the optimum condition was slightly decreased compared to the parent glass. 3) The modulus of rupture was decreased to 720kg/㎠ as that of the parent glass was 1,320kg/㎠. 4) β-quartz and zinc titanium oxide detected in the crystallised glass.

金屬 알콕시드溶液을 利用한 SiO_(2)-Ro_(2)-R_(m)O_(n)系 겔薄膜의 製作 : (2) SiO_(2)-ZrO_(2)-R_(m)O_(n)계의 겔薄膜作成 Part 2. Preparation of Thin Films of SiO_(2)-ZrO_(2)-R_(m)O_(n)(CuO, CoO, Fe_(2)O_(3))Gels

梁重植 慶熙大學校 材料科學技術硏究所 1994 材料科學技術硏究論集 Vol.7 No.-

Films of translucent amorphous SiO_(2)-ZrO_(2)-R_(n)O_(n)(Fe_(2)O_(3), CuO, Co) system have been prepared on substrate of a micro slide glass using Si(OC_(2)H_(6))_(4), Zr(n-OC_(3)H_(7)), Cucl_(2)2H_(2)O, Cocl_(2).6H_(2)O and Fecl_(2)6H_(2)O mixed alcoholic solutions which were hydrolyzed at 28-32℃ by atmospheric moisture(70-80% humidity) to form gels. Formation of film was made by means of simple dip-coating. Films up to about 0.2-0.5μm in thickness can be obtained by repeating the operation, dipping -> pulling up -> hydrolysis and polycondensation -> drying and dehydration at 350℃ -> heating at 500℃ for 30 min. The coated films were examined by measuring the optical far-infrared radiation spectrum and also observed by scanning electron micrograph techniques. The properties of alkoxide solutions, microstructures and far-infrared radiation of these derived films by gels have been investigated. The overcoated films on the substrate were characterized for the application to far-infrared radiant. These results suggest that this process is applicable to far-infrared radiant as thin film technique.

알칼리-석회-붕규산유리에 대한 化學的 表面處理에 따른 物理的 變化

梁重植 慶熙大學校 1985 論文集 Vol.14 No.-

Effects of the ion exchange for an alkali-lime-borosilicate glass, on the improvement of the modulus of rupture and the thermal shock resistance, particularity when sodium ion was exchanged with potassium ion, were studied. Alkali-lime-borosilicate glass whose composition is 71.62% SiO_2, 4.06% CaO, 0.28% MgO, 0.98%K_2O, 14.24% NA_2O was studied in molten potassium nitrate and KNO_3-K_2SO_4 solution at the below the annealing point by means of an automatically controlled Ni-Cr element furnace. The salts were contained in 300ml silica glass crucibles. Specimens were obtained by 60㎜ long cut from drawn cane nominally 5㎜ and 8㎜ in diameter, and etched with a solution Containing 4% H_2SO_4 and 4% HF. The clear specimens were treated in molten salt at 380-500℃ for 30-210 min The potassium ion exchanged glass showed remarkable increase in strength compared to experimental glass; 1) The modulus of rupture value increase up to 3,500 ㎏/㎠ from 1,460 ㎏/㎠. 2) Within the temperatured range considered, 120-190℃ the thermal shock resistance for the potassium ion exchanged glass increased with raising the temperatures and lengthening the period for the treatment.

Basalt 및 Alumina Cement로된 원적외선 방사재료의 방사특성

梁重植 慶熙大學校 材料科學技術硏究所 1995 材料科學技術硏究論集 Vol.8 No.-

The purpose of this investigation was to prepare far-infrared radiant by ceramics made from using a domestic basalt as starting material mixed with a high alumina cement as ceramic binder. The characteristics of far-infrared radiation on the several kinds of the mixed materials, without heatreted and the treated compounds, were studied. These results revealed that the basalt mixed with CaO-Al₂O₃ cement increase in the emissive intensity were detected in the sample dried at 110℃ than the samples sintered at 1,100℃. And the radiants consists of the basalt with CaO-Al₂O₃ cement increased in wavenumbers 1000-1200cm^(-1). The effect of the emissive intensity suggest that the sample shifted to lower wavenumber with the increase in content of alumina contained in the compound.

졸-겔法에 의한 透明結晶化유리의 低溫合成

梁重植 慶熙大學校 材料科學技術硏究所 1993 材料科學技術硏究論集 Vol.6 No.-

Transparent glass-ceramics with a ultra-low thermal expansion coefficient are synthesized by sol-gel process. The multicomponent gel is obtained by hydrolysis and polycondensation reactions of organometallic compounds of silicon, aluminium, zirconium, titanium and lithium. The thermal evalution of the dried gel is followed by DTA and TGA measurements. Structural evolution is followed using X-ray diffraction. The crystallization of virgilite, β-eucryptite(β-quartz solid solution) and β-spodumene(β-quartz solid solution) start at 750℃, 810℃ and 900℃ respectively. The size of crystalline is measured by SEM technique. The glass-ceramics monolith without devitrification can only be obtained by heat-treatment at 750℃ for 5hs from the gel-glass with L_(12)O^(-) Al₂O₃ 4 OS_(1)O₂ O 10T_(1)O₂ 0.15ZrO₂. The thermal expansion of the transparent glass-ceramic is from ca. zero to - 6*10^(-7)/℃. The crystal sizes are below 0.1 μm.

이온선택성 전극을 이용한 콘크리트 중의 가용성 염화물 이온의 전위차 적정

양중식 경희대학교 산학협력기술연구원 1999 산학협력기술연구논문집 Vol.5 No.-

A Water-soluble chloride in concrete has been titrated potentiometrically with silver nitrate as a reagent and used a silver/Sulfide ion-selective electrode as an indicator. By the use of a standard substraction method the experimental detection limit war ~1ppm at th S/N~6 and Silver/Sulfide ion--selective electrode responded in a linear manner to chloride over a wide range of concentration. Although solubility depends on the leaching temperature, we set the leaching temperature at 50℃ for the reason that the maximum temperature of building surface is 50℃ in summer. When the ratio of sample to the amount of leaching water was 1/5 to 1/10, it showed that the leaching ratio of chloride was reproducible result To improve th accuracy, it is very important to fix the ratio of sample to the amount of leaching water. In this study, the amount of water-soluble chloride was raised depending on the leaching time. Over th leaching time of 40minutes the slope of chloride vs. leaching time was constant. Accordingly it is considered that suitable leaching time is 40minutes.

졸-겔法에 依한 塊狀乾燥겔 및 結晶化 유리의 合成

梁重植 慶熙大學校 1988 論文集 Vol.17 No.-

The purpose of this study was to prepare multicomponent dried monolithic gelof composition Li₂O·Al₂O₃·2SiO₂ and the monolithic glass-ceramic of low thermal expansion properly. The hydrolysis, DTA, TGA, SEM and pore distribution of the gel, and thermal expansion of a glass-ceramic formation with a raw materials of which metal alkoxide of network-forming cations(Si and Al) are tetraethyl orthosilicate, aluminum isopropoxide, aluminum sec-buoxide and lithium methoxide. The results are as follows: 1) The monolithic gels which were added with additional water, resulfing in a total water content 2.0 to 3.0 times the stoichiometeric amount required to fully hydrolyze the alkoxides. 2) Crystalline phases were detected β-cucryptite, β-spodumene and β-quartz. 3) The thermal expansion coefficient was shown with -4.8∼13×10^-7/C.

유리 및 結晶化유리를 이용한 高效率遠赤外線 放射體의 製造 : Ⅱ. Sol-Gel법에 의한 제조 Ⅱ. Preparation by Sol-Gel Method

梁重植,백영남 慶熙大學校 材料科學技術硏究所 1991 材料科學技術硏究論集 Vol.4 No.-

The purpose of this investigation was to prepare high efficiency infrared radiant by glasses, glass-ceramics and ceramics made from mixture of several kinds of transitional element oxide. In the 1st report, the glasses and the glass-ceramics(LAS) have the possibility of using as the new high temperature infrared radiant material, that were confirmed. So, in this 2nd report, the infrared radiation effect of glass-ceramic(LAS) by sol-gel method and infrared radiants were developed by sintered LAS-glass with several kinds of transitional metal oxide, ferrite spinel and silicon carbide, respectively. In a mixture consitituted by the LAS-glass, as main material and addition of transitional oxides, ferrite spinel and silicon carbide ingredients as adjunct materials. As the result, the crystallized bulk glass-ceramic by sol-gel method has the properties of not only high surface area and ultra-low thermal expansion, but also high infrared radiation than the conventional LAS glass-ceramic. However, these mixed ceramics were higher radiation infrared radiants than the LAS glass-ceramic radiant.

금속알콕시드 및 겔 실리카로부터 LAS계 투명결정화유리의 합성

양중식 慶熙大學校 材料科學技術硏究所 1998 材料科學技術硏究論集 Vol.11 No.-

Glass of composition Li_(2)O·Al_(2)O_(3)·4SiO_(2)·0.10ZrO_(2)·0.03P_(2)O_(5) was prepared by the sol-gel technique from alkoxides solution with emulsified silica, and heat-treated to make a transparent glass-ceramics. The multicomponent gels are obtained by hydrolysis and poly-condensation reactions of metal-alkoxides of Si, Al, Li, P, and Zr. Transparent glass-ceramic without devitrification can only be obtained by heat-treatment at 750℃ for 2ns from the gel-glass.

SiO₂-AI₂O₃-B₂O₃-CaO-Na₂O계의 유리섬유에 관한 연구

梁重植,韓榮求 건국대학교 1974 論文集 Vol.1 No.1

내 약품성이 양호한 저 알칼리 유리섬유를 제조하기 위하여 도가니 용융법에 의한 연속식 휘라멘트(continuous flament)법12)으로 4종의 저알카리 유리섬유를 제조하였다. 섬유의 제조조건에 의한 물성의 변화와 이를 섬유에 대한 안전성을 규명하였다. 유리성분 중 Al2O3 및 B2O3가 함유된 유리 일지라도 Na2O가 증가 함에 따라 내 약품성이 떠러졌고, 섬유가 굵고 수지로 표면처리된 유리섬유는 안전하였고, 특히 유리섬유는 수지처리에 의하여 내후성이 개선되어 경시변화가 적었음을 나타내고 있다. 본 실험에서는 기초유리에 0.25% Li2O를 첨가한 유리를 1,100℃에서 9∼20μ의 유리섬유로 방사가 가능하였고, 인장강도가 90kg/mm2이상이었다. This paper presents the result of an experimental stogy on the spinner glass fibers of sodium-calcium-alumina-borosilicate glass. The glass fiber was shinned through high-alumina bushing with nozzles at the rate of 500 to 900 m./min. at 1,050˚ to 1,100℃. Physical and chemical properties of monofilament were conducted on 4 kinds of glass fibers. Specimens treated at the specified condition were examined in terms of tensile strength, fiber diameter, chemical durability, and weathering. The results are summarized as follows (1) Specimens composed of glass fiber based on high aluminaborosilicate glass show favorable stability, high tensile strength, good weathering resistance and chemical durability. (2) Resin-coacted fiber gives remarkable chemical durability with increasing diameter.