산학협동과 요업

이종근,Lee Chong Keun 한국시멘트협회 1973 시멘트 심포지움 Vol. No.

티타늄琺瑯후릿트에 關한 硏究

이종근,한기성,Lee, Chong-Keun,Han, Ki-Sung 대한화학회 1957 대한화학회지 Vol.4 No.1

There are two problems to be solved by our efforts in the enamel frit. One is how we can cover the enamel frit thin with complete milk white as possible, and the other is how it can be, made resistant for chemicals than before one. The frit which can solved the two problems just mentioned above is titanium enamel frit. This frit has been developed in America after War Ⅱ, and now the research for concerning antimony frit into titanium frit is under development entirely. In order to develope the enamel industry in Korea, it is urgent problem to convert antimony frit into titanium frit. By the way the titanium frit is emulsified titanium oxide crystal which made through reheating the supersaturated solution of titanium oxide in the basis of glass. Unfortunately, there are many obscure points in active fact or which influence on its composition and characteristics yet. However, this task was tried for the first in Korea. As first step, the test was carried on the reference books, and we can be possible convert antimony frit into titanium frit as a result of this experiment. As a conclusion, for the purpose of developing the enamel industry in Korea, we studied that the research for converting antimony enamel frit which has been used popularly into titanium enamel frit which is more economic and resistant for chemicals. As a result of experiments, the following points concerning with titanium frit have become clearly. 1. It is better when the composition of titanium enamel frit has as following table.Man Duck San Silica 24 An Yang Feldspar 20 Borax 28 Sodium Nitrate 4 Cryolite 7 Calcium Carbonate 3.6∼1 Titanium Oxide 10 Calcium phosphate 0 ∼3.2 Calcium Fluoride 0∼1.8 Antimony Oxide 0∼0.5 2. The amount of $TiO_2$, to be added is $10%\;to\;12{%,\;CaF_2\;is\;under\;1.8%,\;P_2O_5\;is\;under\;1.6%,\;Sb_2O_3\;is\;under\;0.5%$. 3. In the titanium frit, the limit of iron oxide amount to be included is under 0. 5%. 4. Comparing the titanium enamel frit with antimony enamel frit not only the titanium frit can be savely 20.6% in the price of raw materials, but one time of glazing and heating process is omitted in each case, and it is known the titanium frit is more resistant for chemicals than antimony frit.

자기질 연삭 숫돌에 있어서의 결합제와 결합도에 관한 연구

이종근,이병하,오유인,Lee, Chong-Keun,Lee, Byung-Ha,Oho, Yoo-In 한국세라믹학회 1976 한국세라믹학회지 Vol.13 No.4

釉上彩色料에 關한 硏究

이종근,박용완,Lee, Chong-Keun,Park, Yong-Wan 대한화학회 1957 대한화학회지 Vol.4 No.1

High-fire stain is influenced by the conditions of glaze, firing atmosphere, etc. On the contrary, low fire stain is not influenced by those conditions but obtainable in arbitrary colors and it is indispensable for pottery decoration. It is difficult for us to study into the color in the sphere of result publication method and expression of color. Looking over the literature on this subject, I have been confronted with much difficulties, accordingly, I made a basic and systematic experiment as to six low-firing stains (blue, green, blue-green, brown black and yellow) and made it proper to be applied in these studies. On pigment, I confirmed the influence of the assistant coloring matter by mixing up the coloring matter and the assistant coloring matter in various proportions. On flux, I measured the melting point by making PbO-$SiO_2$ system and PbO-$B_2O_3-SiO_2$ system and decided the range of usage. Also I checked the coloring by making the pigment on laze with pigment and flux manufactured, and concluded the pigment and flux adaptation to it.

한국형 인공슬관절 신합금 개발을 위한 실험적연구

배대경(Dae Kyung Bae),김상훈(Shang Hoon Kim),최주(Ju Choi),김재수(Jae Soo Kim),이종근(Chong Keun Lee) 대한정형외과학회 1986 대한정형외과학회지 Vol.21 No.6

융제법에 의한 규회석 단결정 성장에 관한 연구

이종근,한상목 한국화학공학회 1975 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.13 No.1

염화나트리움을 융제로 하여 의규회석 (α-CaSiO₃)의 단결정을 성장시켰으며, 육성방법은 백금도가니를 사용하여 1200℃에서 800℃까지 3-5℃/hr의 서냉속도로 행하였다. 출발원료는 화학양론적인 몰비(CaO:SiO₂=1:1)에 의해 고상 또는 수열반응으로 합성하였으며 이를 원료로해서 얻은 단결정들은 b축으로 성장한 단책상(lath-like)결정이었다. 이는 도가니 벽면에 서냉에 의하여 과포화용액의 침전으로 말미암아 자연 발생적인 핵이 생성되어 성장한 것이며 이 단결정들을 광학현미경으로 크기를 조사하고 X-선 회절법 및 투과와 주사전자현미경으로 여러 특성을 연구하였다. Single crystals of pseudo-wollastonite (α-CaSiO₃) were growth by using NaCl as flux. The experiments for growing crystals were carried out in platinum crucible by cooling slowly the fused matter from 1200℃ to 800℃ at a rate of 3∼5℃/hr. The starting raw materials used have been synthesized with stoichiometric mole ratio (CaO:SiO₂=1:1) by solid and hydrothermal reaction. The grown crystals obtained in such a method have lath-like habit elongated to b-axis. These seemed to be grown from spontaneous nuclei which were precipitated on the wall of the crucible from the supersaturated solution by slow cooling. The crystal size was measured by all optical microscope and various characteristics were also investigated by using X-ray diffractometer, electron microscope, and scanning microscope.

석출형 Ni 형초내열합금의 유계적 합금설계

최주,이종근,최승주 대한금속재료학회(대한금속학회) 1981 대한금속·재료학회지 Vol.19 No.7

Trials were made to develop gamma prime precipitation hardened nickel-base superalloys which have both excellent creep rupture strength and hot corrosion resistance. The factors which influence high temperature characteristics were expressed a function of alloy composition by means of multiple regression analysis. Setting certain conditions on the factors, alloy composition was calculated with use of the computer. The alloys developed by this method are proved to be excellent in creep rupture strength and sulfidation resistance.

Ni 기초내열합금의 내유화부식성 개선에 대하여

최주,이종근,최종술 대한금속재료학회(대한금속학회) 1980 대한금속·재료학회지 Vol.18 No.4

耐硫化腐蝕性을 改善하기 위하여 Ni基超耐熱鑄造合金의 組成을 電子計算機로 算出하여 眞空溶解한 다음 實驗合金과 旣存合金을 900℃, 75%Na₂SO₄+25%NaCl 溶融鹽을 써서 도가니試驗을 하였다. Scale層을 EPMA 및 電子廻析法으로 調査해본 바 實驗合金에 있어서는 바깥부터 基地와 密着性이 좋은 Cr₂O₃, TiO₂ 및 Al₂O₃層이 차례로 形成되어 耐硫化腐蝕性을 크게 改善하였으며 한편 旣存合金인 Mar-M200에 있어서는 Al₂O₃層이 形成되어 加速酸化가 일어났다. 耐蝕性에 대한 合金元素의 效果를 보기 위하여 腐蝕깊이와 組成間의 關係式을 重回歸法으로 求해 본 바 Cr과 함께 Ti 및 Al도 매우 有效하였으며 한편 Co 및 W는 큰 影響을 끼치지 않았다. For the improvement of sulfidation resistance, several experimental nickel-base superalloys were newly designed by utilizing computer. The corrosion test was carried out using molten salt of 75%Na₂SO₄+25%NaCl at 900℃. Oxide scales of experimental alloys being examined by EPMA and electron diffraction were shown to consist of Cr₂O₃, TiO₂ at the outer side and Al₂O₃ at the innermost which was tightly adherent to the matrix. It is, therefore, proposed that the superior sulfidation resistance of experimental alloys is attributed to the excellent adherent oxide layers. The relationship between corrosion depth and alloying elements was obtained by means of multiple regression analysis. This led to a conclusion that Ti, Al and Cr improve greatly hot corrosion resistance whereas Co and W influence little it.

석출 강화형 Ni-Cr-W 계 초내열 합금의 합금설계

최주,이종근,최종술 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.9

A wrought nickel-base superalloy aimed to be used at above 1000℃ was designed by means of a statistical method. The alloy designed and investigated was based on the Ni-Cr-W-Ti-Al system, where the strangthening was achieved by a solid solution hardening superimposed with the gamma prime precipitation hardening. The new alloy exibited both excellent creep rupture strength and better corrosion resistance, and the rupture life of the alloy had reached up to 550 hr at 1000℃ under the stress of 4㎏/㎟. The main precipitates contributing to the elevation of high temperature strength were found to be the randomly distributed coarse alpha tungsten particles together with the uniformly distributed fine gamma prime particles. In this alloy. the carbide of M_(23)C_6 type was appeared to be stable precipitate after a long time heat treatment at 900℃ whereas that of M_6C type was stable at 1000℃.