Pengaruh Variasi Waktu Sintering Terhadap Pertumbuhan Fase Bahan Superkonduktor BSCCO-2212 dengan Kadar Ca=1,10 Menggunakan Metode Pencampuran Basah

This research was conducted to determine the effect of sintering time on the formation of the superconducting phase BSCCO-2212 by calculating the level of purity of the phases formed and looking at the microstructure. The variation of sintering time was 10, 20, 30 and 40 hours using the wet mixing method. The sample was calcinated with 800 °C for 10 hours and sintered with 830 °C. The XRD’s characterization result shows a decrease in phase purity with increasing the sintering time. The relative high volume fraction of the BSCCO-2212/ts10 sample is 90,48% while, the lowest volume fraction of BSCCO-2212/tc40 is 50,74%. The relative high orientation degree of BSCCO-2212/ts20 is 18,47% and the lowest orientation degree of BSCCO-2212/ts10 is 8,4%. The SEM’s characterization result shows of all samples have been oriented and have relatively little space between slabs (voids).

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Sintesis Superkonduktor BSCCO-2223 dengan Variasi Waktu Sintering pada Kadar Ca=2,10 Menggunakan Metode Pencampuran Basah

Jurnal Teori dan Aplikasi Fisika ◽

10.23960/taf.v7i2.1980 ◽

2019 ◽

Vol 7 (2) ◽

pp. 139-144

Author(s):

Siti Istikomah ◽

◽

Suprihatin Suprihatin ◽

Agus Riyanto ◽

◽

...

Keyword(s):

Volume Fraction ◽

Orientation Degree ◽

Phase Purity ◽

Sintering Time ◽

Purity Level ◽

Degree Of Orientation ◽

Mixing Method

Research about the effect of sintering time on the phase purity level of superconductor BSCCO-2223 at the level of Ca 2,10 has been synthesized using the wet-mixing method. Sample dissolved is slowly with HNO3 and aquades, then drying gradually temperature of 300, 400, 600 °C. The sample was calcined for 10 hours at 800 °C and sintered using variations of time 10, 20, 30, and 40 hours at 865°C. Variations were carried out to determine the effect of sintering time on the purification of the superconductor. XRD results show that sintering time has an effect on the volume fraction value of BSCCO-2223. Volume fraction that is relatively high at 30 hours sintering time is 79,17 % with an orientation degree value of 37.94%. While the lowest was obtained at the time of sintering for 10 hours with the volume fraction of 38.47% with a degree of orientation of 15.27%. the SEM results show that all samples have layers oriented and have relatively little space between the plates (voids).

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Analisis Pertumbuhan Fase Superkonduktor BSCCO-2212 dan BPSCCO-2212 Akibat Variasi Suhu Sintering Menggunakan Metode Pencampuran Basah

Journal of Energy, Material, and Instrumentation Technology ◽

10.23960/jemit.v2i4.77 ◽

2021 ◽

Vol 2 (4) ◽

pp. 86-95

Author(s):

Pulung Karo Karo ◽

◽

Risky Putra Ramadhan ◽

Suprihatin Suprihatin ◽

Yanti Yulianti

Keyword(s):

Volume Fraction ◽

Sintering Temperature ◽

Superconducting Phase ◽

Phase Purity ◽

Optimum Point ◽

Purity Level ◽

Degree Of Orientation ◽

Mixing Method

The research was conducted to determine the effect of sintering temperature on the level of purity of the superconducting phase BSCCO-2212 and BPSCCO-2212 using the wet mixing method. Sintering was carried out for 20 hours with variations in sintering temperature: 825, 830, 835 and 840°C. XRD results showed that the phase purity level increased until it reached the optimum point at 835°C sintering temperature and then decreased at 840°C. The highest volume fraction of the BSCCO-2212 sample was obtained at a sintering temperature of 835°C at 71.09% and the highest degree of orientation was obtained at a sintering temperature of 830°C at 26.44%. In the BPSCCO-2212 sample, the highest volume fraction was obtained at a sintering temperature of 835°C at 52.59% and the highest degree of orientation at a sintering temperature of 830°C at 43.49%. The results of the comparison of BSCCO-2212 and BPSCCO-2212 samples showed that the BPSCCO-2212 sample had a higher level of phase purity than BSCCO-2212.

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Face Grinding Surface Quality of High Volume Fraction SiCp/Al Composite Materials

Chinese Journal of Mechanical Engineering ◽

10.1186/s10033-020-00527-2 ◽

2021 ◽

Vol 34 (1) ◽

Author(s):

Xu Zhao ◽

Yadong Gong ◽

Guiqiang Liang ◽

Ming Cai ◽

Bing Han

Keyword(s):

Friction Coefficient ◽

Surface Morphology ◽

Surface Quality ◽

Volume Fraction ◽

High Volume ◽

Spindle Speed ◽

High Volume Fraction ◽

Machining Parameters ◽

Al Composite

AbstractThe existing research on SiCp/Al composite machining mainly focuses on the machining parameters or surface morphology. However, the surface quality of SiCp/Al composites with a high volume fraction has not been extensively studied. In this study, 32 SiCp/Al specimens with a high volume fraction were prepared and their machining parameters measured. The surface quality of the specimens was then tested and the effect of the grinding parameters on the surface quality was analyzed. The grinding quality of the composite specimens was comprehensively analyzed taking the grinding force, friction coefficient, and roughness parameters as the evaluation standards. The best grinding parameters were obtained by analyzing the surface morphology. The results show that, a higher spindle speed should be chosen to obtain a better surface quality. The final surface quality is related to the friction coefficient, surface roughness, and fragmentation degree as well as the quantity and distribution of the defects. Lower feeding amount, lower grinding depth and appropriately higher spindle speed should be chosen to obtain better surface quality. Lower feeding amount, higher grinding depth and spindle speed should be chosen to balance grind efficiently and surface quality. This study proposes a systematic evaluation method, which can be used to guide the machining of SiCp/Al composites with a high volume fraction.

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Study on the High-Speed Milling Performance of High-Volume Fraction SiCp/Al Composites

Materials ◽

10.3390/ma14154143 ◽

2021 ◽

Vol 14 (15) ◽

pp. 4143

Author(s):

Youzheng Cui ◽

Shenrou Gao ◽

Fengjuan Wang ◽

Qingming Hu ◽

Cheng Xu ◽

...

Keyword(s):

High Speed ◽

Large Scale ◽

Volume Fraction ◽

Simulation Analysis ◽

Cutting Temperature ◽

High Volume ◽

Cutting Parameters ◽

High Volume Fraction ◽

High Wear Resistance ◽

Element Analysis

Compared with other materials, high-volume fraction aluminum-based silicon carbide composites (hereinafter referred to as SiCp/Al) have many advantages, including high strength, small change in the expansion coefficient due to temperature, high wear resistance, high corrosion resistance, high fatigue resistance, low density, good dimensional stability, and thermal conductivity. SiCp/Al composites have been widely used in aerospace, ordnance, transportation service, precision instruments, and in many other fields. In this study, the ABAQUS/explicit large-scale finite element analysis platform was used to simulate the milling process of SiCp/Al composites. By changing the parameters of the tool angle, milling depth, and milling speed, the influence of these parameters on the cutting force, cutting temperature, cutting stress, and cutting chips was studied. Optimization of the parameters was based on the above change rules to obtain the best processing combination of parameters. Then, the causes of surface machining defects, such as deep pits, shallow pits, and bulges, were simulated and discussed. Finally, the best cutting parameters obtained through simulation analysis was the tool rake angle γ0 = 5°, tool clearance angle α0 = 5°, corner radius r = 0.4 mm, milling depth ap = 50 mm, and milling speed vc= 300 m/min. The optimal combination of milling parameters provides a theoretical basis for subsequent cutting.

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