• 한국재료학회지
• /
• 제32권12호
• /
• pp.538-544
• /
• 2022

In existing ceramic mold manufacturing processes, inorganic binder systems (Si-Na, two-component system) are applied to ensure the effective firing strength of the ceramic mold and core. These inorganic binder systems makes it possible to manufacture a ceramic mold and core with high dimensional stability and effective strength. However, as in general sand casting processes, when molten metal is injected at room temperature, there is a limit to the production of thin or complex castings due to reduced fluidity caused by the rapid cooling of the molten metal. In addition, because sodium silicate generated through the vitrification reaction of the inorganic binder is converted into a liquid phase at a temperature of 1,000 ℃. or higher, it is somewhat difficult to manufacture parts through high-temperature casting. Therefore, in this study, a high-strength ceramic mold and core test piece with effective strength at high temperature was produced by applying a Si-Na-Ti three-component inorganic binder. The starting particles were coated with binary and ternary inorganic binders and mixed with an organic binder to prepare a molded body, and then heat-treated at 1,000/1,350/1,500 ℃ to prepare a fired body. In the sample where the two-component inorganic binder was applied, the glass was liquefied at a temperature of 1,000 ℃ or higher, and the strength decreased. However, the firing strength of the ceramic mold sample containing the three-component inorganic binder was improved, and it was confirmed that it was possible to manufacture a ceramic mold and core via high temperature casting.

• 한국농공학회논문집
• /
• 제56권5호
• /
• pp.37-44
• /
• 2014

The physical, mechanical and freezing and thawing properties of non cement porous vegetation concrete using non-sintering inorganic binder have been evaluated in this study. Four types of porous vegetation concrete according to the binder type is evaluated. The pH value, void ratio, compressive strength, repeated freezing and thawing properties were tested. The test results indicate that the physical, mechanical and repeated freezing and thawing properties of porous vegetation concrete using the non-sintering inorganic binder is increased or equivalent compared to the porous vegetation concrete using the blast furnace slag + cement and hwang-toh + cement binders. Also, Vegetation monitoring test results indicate the porous vegetation concrete using the non-sintering inorganic binder have increasing effects of vegetation growth.

• 한국산학기술학회논문지
• /
• 제6권4호
• /
• pp.337-341
• /
• 2005

본 연구에서는 광촉매 $TiO_2/P-25$를 POF에 코팅하여 IPA 분해 활성을 고찰한 결과, 코팅 시 용매의 조건은 에탄올에서 IPA의 분해효율이 가장 우수하였고 무기바인더(KR-400), 유기바인더(A-9540) 및 무$\cdot$유기 복합바인더(GPTMS, TMOS)중에서 유기 바인더인 A-9540을 사용했을 때 효율이 가장 우수한 것으로 나왔다. 유기 바인더는 광 분해반응에 의하여 바인더 자체가 분해되고 무기 바인더는 부착성이 떨어졌다. 유$\cdot$무기 복합 바인더 중에서 광분해 효율이 뛰어난 TMOS를 바인더로 선정하여 TMOS/P-25의 비율을 0.05부터 1로 바꾸어 광분해 실험을 수행한 결과, 바인더로써 TMOS의 첨가는 IPA분해 효율을 낮게 하였다.

• 한국광물학회지
• /
• 제27권4호
• /
• pp.251-262
• /
• 2014

석조문화재 보수물질로서의 적용을 위해 무기질 바인더를 시험하였다. 순수 무기질 바인더와 첨가제를 배합한 3종을 시편으로 제작하였고 거창화강석에 무기질 바인더 시편들을 부착시켜 무기질 바인더가 암석에 미치는 영향을 분석하였다. 무기질 바인더와 반응시킬 pH 4.0과 pH 5.6 수용액을 국내 강우의 산성도와 함유이온을 토대로 제조하였다. pH 8.0 약알칼리수와 pH 6.85 탈이온수를 준비하여 산성수의 대조군으로 적용하였다. 물반응 후 무기질 바인더 시편의 무게 감소는 시편의 종류에 따라서는 컸지만 물의 산성도와 상관성은 적었다. 순수 무기질 시편의 압축강도가 가장 컸으나 물반응 후 감소율이 가장 크다. 큰 흡수율은($6.72-12.44kg/m^2{\cdot}t^{1/2}$) 무기질 바인더로부터 용출된 이온 함량과 상관성이 크다. 모든 액성의 수용액이 무기질 바인더와 반응 후 pH 9.0-10.0로 변화하였으며, 수용액에서는 무기질 바인더에서 용해된 $Mg^{2+}$와 $K^+$이 다량 검출되었다. 용해된 이온들은 수용액 내 음이온들과 결합하여 높은 용해도를 지닌 $MgSO_4{\cdot}nH_2O$ 및 $KNO_3$와 같은 백색염을 형성하였다. 암석강화제와 발수제를 처리한 무기질 바인더 시편에서는 이온량이 급격하게 감소하였다.

• 한국재난정보학회 논문집
• /
• 제12권3호
• /
• pp.286-291
• /
• 2016

본 연구에서는 불연성 무기단열재를 제조하기 위해 바인더 종류를 대체하여 열전도율을 충족시키고 경량 무기단열재 개발을 위해 연구하였다. 열전도율 측정은 열전도 측정기인 HFM-436을 이용하여 열전도율을 측정하였다. 무기단열재를 바인더 SH-1(액체), SH-2(고체)와 펄라이트를 배합하여 단열재 샘플1을 만들었고, SH-3(액체)와 펄라이트를 배합하여 단열재 샘플 2를 제조했다. 총 4개의 샘플을 제조했다. 각각 바인더와 펄라이트를 틀에 넣어 성형하였으며 완전건조 후 HFM-435을 이용하여 열전도율을 측정하였다. 두 가지 다른 바인더를 사용하여 열전도율을 측정하였고 바인더에 따른 열전도율의 영향을 분석하였다.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2015년도 추계 학술논문 발표대회
• /
• pp.11-12
• /
• 2015

This study analyzed sulfate resistance of strongly acid-resistant inorganic binder based on industrial byproducts. According to the study experiment, compared to OPC mixture, the mixture of high acid-resistant inorganic binder had excellent chemical resistance against 10% H₂SO₄ solution. In the case of ordinary portland cement, its sample with 28 days of immersion had severe corrosion on its mortar erosion part, and thus external appearance was damaged greatly, and compression strength decreased by around 57% and more.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2014년도 춘계 학술논문 발표대회
• /
• pp.100-101
• /
• 2014

The global warming because of the CO₂ emission and solution about this emerge as the international enviroment problem. Particularly, it is the absolutely it is needed for reducing the CO₂ in the cement industry and harmful material actual condition. And the construction of home and abroad and material manufacturers tries for the technology development for the carbon dioxide and harmful material reduction which the portland cement in manufacture is usually emitted along with the increase of concerns about the environment-friendly concrete and panel. Therefore, in this research, the compressive strength of the inorganic binder and flexural strength tries to be measured in order to draw the inappropriate high temperature cure time of the ternary system inorganic binder using the blast furnace slag, red mud, silica fumewhich is the industrial byproduct with the cement substitute material, and etc.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2012년도 춘계 학술논문 발표대회
• /
• pp.259-262
• /
• 2012

Recently, as the national policy of green growth is promoted, construction field also makes an effort to reduce CO₂ gas released when producing cement continuously. In other words, as the method solving environmental pollution and resources exhaustion, lots of mineral material compounds such as blast furnace slag powder which is industrial by-product, fly ash, red mud, etc. are examined to bo used as the substitute good of cement Therefore this study is to investigate the hardening characteristics of alumino-silicate inorganic binder using red-mud used as a accelerator of industrial by-product such as fly ash and blast furnace slag powder according to curing temperature. As a result, it is effective to use red-mud as the accelerator of inorganic binder with other additory accelerators.

• 한국도로학회논문집
• /
• 제17권6호
• /
• pp.19-26
• /
• 2015

PURPOSES : This study intends to develop an inorganic soil pavement material using industrial by-products and to evaluate its applicability as a road pavement material. METHODS : In this study, a compressive strength experiment was conducted based on the NaOH solution molarity and water glass content to understand the strength properties of the soil pavement material according to the mixing ratio of alkali activator. In addition, the strength characteristic of the inorganic soil pavement material was analyzed based on the binder content. The performance of the soil pavement was evaluated by conducing an accelerated pavement test and a falling weight deflectometer (FWD) test. RESULTS : As a result of the soil pavement material test based on the mixture ratio of alkali activator, it was identified that the activator that mixed a 10 M NaOH solution to water glass in a 5:5 ratio is appropriate. As a result of the inorganic soil pavement materials test based on the binder content, the strength development increased sharply when the amount of added binder was over 300 kg; this level of binder content satisfied 28 days of 18 MPa of compression strength, which is the standard for existing soil pavement design. According to the measured results of the FWD test, the dynamic k-value did not show a significant difference before or after the accelerated pavement testing. Furthermore, the effective modulus decreased by approximately 50%, compared with the initial effective modulus for pedestrian pavement. CONCLUSIONS : Based on these results, inorganic soil pavement can be applied by changing the mixture proportions according to the use of the pavement, and can be utilized as road pavement from light load roads to access roads.

• 한국세라믹학회지
• /
• 제53권5호
• /
• pp.541-547
• /
• 2016

In developing high temperature molds with advantages of the sand and precision (investment) castings, mechanical properties of the mold were improved through homogeneous coating of starting powders with an inorganic binder and improvement of fabrication process. Beads with mullite composition were employed for properties of the mold under high temperature, which was compared with artificial sands. Precursors of silica and sodium oxide were used as starting materials for an inorganic binder to achieve homogeneous coating on the starting powders. Strength was enhanced by the glass phase converted from the inorganic binder through heat treatment process. Also, two kinds of process, wet and dry processes, were incorporated to prepare mold specimens. Consequently, fabrication process of the mold with superior strength and high temperature applicability, compared with the previous molds for sand casting, could be suggested through control of the starting material and enhancement of the vitrification efficiency.