Mica-glass ceramics has features such as micro-sized crystals, high strength, chemical resistance, semitransparent optical properties, etc. Due to its superior material properties, mica glass ceramics have increasing applications in dental and medical components, insulation boards, chemical devices,...
Mica-glass ceramics has features such as micro-sized crystals, high strength, chemical resistance, semitransparent optical properties, etc. Due to its superior material properties, mica glass ceramics have increasing applications in dental and medical components, insulation boards, chemical devices, etc. In many applications, especially for dental and medical components, ultra-precise polishing is required. However, it is known to be a very difficult-to-grind material because of its high hardness and brittle properties. Thus, in this study, a newly developed ultra-precise polishing method is applied to obtain nano-level surface roughness of the mica glass ceramics using magnetorheological (MR) fluids and nano abrasives. Nano-sized ceria particles were used for the polishing of the mica glass ceramics. A series of experiments were performed under various polishing conditions, and the results were analyzed. A very fine surface roughness of Ra=6.127 nm could be obtained.
Mica-glass ceramics has features such as micro-sized crystals, high strength, chemical resistance, semitransparent optical properties, etc. Due to its superior material properties, mica glass ceramics have increasing applications in dental and medical components, insulation boards, chemical devices, etc. In many applications, especially for dental and medical components, ultra-precise polishing is required. However, it is known to be a very difficult-to-grind material because of its high hardness and brittle properties. Thus, in this study, a newly developed ultra-precise polishing method is applied to obtain nano-level surface roughness of the mica glass ceramics using magnetorheological (MR) fluids and nano abrasives. Nano-sized ceria particles were used for the polishing of the mica glass ceramics. A series of experiments were performed under various polishing conditions, and the results were analyzed. A very fine surface roughness of Ra=6.127 nm could be obtained.
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가설 설정
An illustration of the MR fluid polishing system for the experiment is shown in Fig. 2. The MR fluid polishing system uses only MR fluid which has CI particles, DI water, and stabilizer(Na2CO3 and Glycerin). A magnetic field is applied to the rotating wheel.
제안 방법
Utilization of mica glass ceramics is increasing in research area of biomedical including dental restoration applications. In this study, a newly developed polishing method using magnetorheological fluids (MR fluids) is applied to obtain ultra-precision surface roughness for mica glass ceramics. This method is considered potentially effective solutions to solve problems arising in traditional polishing methods, including pressure control, pad wear, subsurface damage, and micro crack propagation problems.
), rotating wheel speed, imposed magnetic field density, machining depth, etc. In this study, a series of experiments were performed by changing process parameters to investigate the ultra-precision polishing behavior of the prepared mica glass ceramics. As a result, very fine surface roughness of Ra=6.
In this study, a series of experiments were performed to investigate the ultra-precision polishing characteristics of mica glass-ceramics using MR fluids with nano-size ceria abrasives. The surface roughness variations were measured by changing the process parameters such as magnetic field intensity, wheel rotation speed.
Experimental conditions are listed in Table 3. Polished specimens were measured using a three-dimensional surface profiler (NV6200, Zygo, U.S.A.), and the results were analyzed.
성능/효과
Three-axis motion stages (two linear and one rotational) are assembled on the table for the feeding and the positioning of the workpiece. Compositions of the used MR fluids are listed in the Table 2. Since the MR polishing results are highly affected by the surface conditions of the workpiece, the specimens were pre-polished to have uniform surface roughness of 32nm.
2. Very fine surface roughness of Ra=6.127nm was obtained when applied magnetic field intensity of 4.7 kA/m and rotating wheel speed of 616 mm/s.
The surface roughness after MR fluid polishing is shown in Fig. 5. As the results of this experiments, very fine surface roughness of Ra=6.127 nm was obtained. Fig.
참고문헌 (6)
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