In the study, to manufacturing process of 500 μm pore size was confirmed by varying the sintering temperature of the foamed glass used as a chimney lining block of a thermal power plant with a nano-carbon blowing agent. It was confirmed that a process shows improved compressive strength by 1.4 times...
In the study, to manufacturing process of 500 μm pore size was confirmed by varying the sintering temperature of the foamed glass used as a chimney lining block of a thermal power plant with a nano-carbon blowing agent. It was confirmed that a process shows improved compressive strength by 1.4 times by adding 0∼50 wt% basalt fiber addition at 750 ℃ sintering conditions. Firstly, to fabricate foamed glass with 500 μm closed pores in the temperature range below 1000 ℃, in this study, 0 ∼ 10 wt% nano carbon was used as blowing agents and examined a new process that can lower the process temperatures below existing sintering process temperatures under process conditions that can lower the costs. In order to confirmed the optimum blowing agent contents and sintering temperature, 0-10 wt% 35 nm nano carbon was added to 10㎛ glass powder (CaO, MgO, Al2O3–83% SiO2), and sintered at 700-900 ℃. We also examined the properties of the foamed glasses resulting from this new approach, including mechanical properties. To check the pore types of the sintered samples, 50 μƖ of H2O was dropped on the specimen surface using a micropipette. The pore size was confirmed by an optical microscope. To check the porosity, an image analyzing program was used. Instron and a heat flow meter were used to examine the changes in mechanical strength and thermal conductivity respectively. The main experimental results showed that the sintering at 700 °C showed a pore size of less than 351.3 μm and a high compressive strength of 2.5 MPa or more, but the porosity was less than 60%, making it inappropriate for use as an insulating material. When sintered at 800 °C or higher, a pore size of 120 to 2000 μm and a porosity of 50 to 80% were confirmed depending on the temperature. At this time, the compressive strength was confirmed to be 0.06 MPa or more, it was determined not be possible to use it as an insulating material. When sintering at 750 ℃, it was confirmed that the pore size of 500 ㎛ and porosity was confirmed to 45 ∼ 70%. At this time, the compressive strength was over 1.8 MPa, confirmed to the possibility of use as an insulating material. Therefore, we confirmed a 500 μm foam glass fabrication process with appropriate 6 wt% nano carbon addition and sintering temperature of 750 ℃ that shows improved compressive strength and reasonable thermal conductivity. Secondly, Basalt-fiber between 0 and 50 wt% was added to 10 μm glass powder containing 6 wt% nano-carbon and was low-temperature sintered at 750 ℃ to produce reinforced foam glass. The changes in mechanical properties and thermal conductivities of fiber reinforced foam glass produced by adding 0 ∼ 50 wt% basalt-fibers to 10 μm glass powder containing 6 wt% nanocarbon via low-temperature sintering at 750 ℃were examined. The prepared basalt-fibers with an aspect ratio of 70.88, whose diameter was 12 μm and length was 880 μm, to the prepared glass powder, the mixture underwent ball milling for 15 min. To analysis of pore type, pore size, pore rate, compressive strength, and thermal conductivity was same as the previous experiment. In addition, to assess the microstructure and aspect ratio of pores of the sample, FE-SEM and image analysis program were used, respectively. The main experimental results showed that the sample was confirmed to have closed pores up to the addition of 13 wt% basalt-fiber, with open pores being observed from 20 wt% or more. Microstructure analysis showed that the sample was shown to have dense basalt-fiber clusters with an even distribution of pores at 13 wt% basalt-fibers, whereas irregular pores formed with more basalt fiber addition. Compressive strength was increased by approximately 48 % compared to the sample without basalt-fiber addition while the sample with 13 wt% basalt-fibers showed gradual improvement up to a total of 2.96 MPa and then a gradual decrease with more addition. The thermal conductivity was seen to increase from 0.16 to 0.28 W/mㆍK with increasing basalt-fiber addition; nevertheless, the properties were suitable for using the samples as a thermal insulator. Therefore, by adding an appropriate amount of basalt-fiber to existing foam glass and performing low-temperature sintering at 750 °C, it was possible to produce a new fireproof compatible foam glass that has improved mechanical properties and whose thermal conductivity characteristics were not significantly changed.
In the study, to manufacturing process of 500 μm pore size was confirmed by varying the sintering temperature of the foamed glass used as a chimney lining block of a thermal power plant with a nano-carbon blowing agent. It was confirmed that a process shows improved compressive strength by 1.4 times by adding 0∼50 wt% basalt fiber addition at 750 ℃ sintering conditions. Firstly, to fabricate foamed glass with 500 μm closed pores in the temperature range below 1000 ℃, in this study, 0 ∼ 10 wt% nano carbon was used as blowing agents and examined a new process that can lower the process temperatures below existing sintering process temperatures under process conditions that can lower the costs. In order to confirmed the optimum blowing agent contents and sintering temperature, 0-10 wt% 35 nm nano carbon was added to 10㎛ glass powder (CaO, MgO, Al2O3–83% SiO2), and sintered at 700-900 ℃. We also examined the properties of the foamed glasses resulting from this new approach, including mechanical properties. To check the pore types of the sintered samples, 50 μƖ of H2O was dropped on the specimen surface using a micropipette. The pore size was confirmed by an optical microscope. To check the porosity, an image analyzing program was used. Instron and a heat flow meter were used to examine the changes in mechanical strength and thermal conductivity respectively. The main experimental results showed that the sintering at 700 °C showed a pore size of less than 351.3 μm and a high compressive strength of 2.5 MPa or more, but the porosity was less than 60%, making it inappropriate for use as an insulating material. When sintered at 800 °C or higher, a pore size of 120 to 2000 μm and a porosity of 50 to 80% were confirmed depending on the temperature. At this time, the compressive strength was confirmed to be 0.06 MPa or more, it was determined not be possible to use it as an insulating material. When sintering at 750 ℃, it was confirmed that the pore size of 500 ㎛ and porosity was confirmed to 45 ∼ 70%. At this time, the compressive strength was over 1.8 MPa, confirmed to the possibility of use as an insulating material. Therefore, we confirmed a 500 μm foam glass fabrication process with appropriate 6 wt% nano carbon addition and sintering temperature of 750 ℃ that shows improved compressive strength and reasonable thermal conductivity. Secondly, Basalt-fiber between 0 and 50 wt% was added to 10 μm glass powder containing 6 wt% nano-carbon and was low-temperature sintered at 750 ℃ to produce reinforced foam glass. The changes in mechanical properties and thermal conductivities of fiber reinforced foam glass produced by adding 0 ∼ 50 wt% basalt-fibers to 10 μm glass powder containing 6 wt% nanocarbon via low-temperature sintering at 750 ℃were examined. The prepared basalt-fibers with an aspect ratio of 70.88, whose diameter was 12 μm and length was 880 μm, to the prepared glass powder, the mixture underwent ball milling for 15 min. To analysis of pore type, pore size, pore rate, compressive strength, and thermal conductivity was same as the previous experiment. In addition, to assess the microstructure and aspect ratio of pores of the sample, FE-SEM and image analysis program were used, respectively. The main experimental results showed that the sample was confirmed to have closed pores up to the addition of 13 wt% basalt-fiber, with open pores being observed from 20 wt% or more. Microstructure analysis showed that the sample was shown to have dense basalt-fiber clusters with an even distribution of pores at 13 wt% basalt-fibers, whereas irregular pores formed with more basalt fiber addition. Compressive strength was increased by approximately 48 % compared to the sample without basalt-fiber addition while the sample with 13 wt% basalt-fibers showed gradual improvement up to a total of 2.96 MPa and then a gradual decrease with more addition. The thermal conductivity was seen to increase from 0.16 to 0.28 W/mㆍK with increasing basalt-fiber addition; nevertheless, the properties were suitable for using the samples as a thermal insulator. Therefore, by adding an appropriate amount of basalt-fiber to existing foam glass and performing low-temperature sintering at 750 °C, it was possible to produce a new fireproof compatible foam glass that has improved mechanical properties and whose thermal conductivity characteristics were not significantly changed.
AI-Helper
※ AI-Helper는 부적절한 답변을 할 수 있습니다.