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Agus Edy Pramono,Muhammad Zaki Nura,Johny Wahyuadi M. Soedarsono,Nanik Indayaningsih 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
Experimental research on carbon ceramic composites fabricated from carbon and organoclay had been conducted. Electrical conductivity, specific wear rate, density and porosity, morphology, SEM EDX, and XRD were studied. The higher the content of carbon powder, the higher the electrical conductivity produced. Likewise, the higher the sintering temperature of composite increases the electrical conductivity of carbon ceramic composite. The higher the carbon powder content reduces the composite wear rate. Carbon content can increase the hardness of carbon ceramic composites. Composite density tends to be relatively stable with increasing sintering temperature. Increasing the content of carbon powder has shown to reduce composite density. The composite is getting lighter. The higher the carbon content in the composite increases the percentage of porosity of carbon ceramic composites, but it can still increase the electrical conductivity. Generally, carbon ceramic composites contain macroporous.
Nath, K. Amar,Prasad, K.,Chandra, K.P.,Kulkarni, A.R. Techno-Press 2013 Advances in materials research Vol.2 No.2
Impedance and electrical conduction studies of $Ba(Nd_{1/2}Nb_{1/2})O_3$ ceramic prepared using conventional high temperature solid-state reaction technique are presented. The crystal symmetry, space group and unit cell dimensions were estimated using Rietveld analysis. X-ray diffraction analysis indicated the formation of a single-phase cubic structure with space group $Pm\bar{3}m$. Energy dispersive X-ray analysis and scanning electron microscopy studies were carried to study the quality and purity of compound. The circuit model fittings were carried out using the impedance data to find the correlation between the response of real system and idealized model electrical circuit. Complex impedance analyses suggested the dielectric relaxation to be of non-Debye type and negative temperature coefficient of resistance character. The correlated barrier hopping model was employed to successfully explain the mechanism of charge transport in $Ba(Nd_{1/2}Nb_{1/2})O_3$. The ac conductivity data were used to evaluate the density of states at Fermi level, minimum hopping length and apparent activation energy.
전도성을 가지는 하이브리드 Ti<sub>2</sub>AlN 세라믹 복합체의 마이크로 방전드릴링에서 가공성 평가
허재영,정영근,강명창,Heo, Jae-Young,Jeong, Young-Keun,Kang, Myung-Chang,Busnaina, Ahmed 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.4
$Ti_2AlN$ composites are a laminated compounds that posses unique combination of typical ceramic properties and typical metallic(Ti alloy) properties. In this paper, the powder synthesis, SPS sintering, composite characteristics and machinability evaluation were systematically conducted. The random orientation characteristics and good crystallization of the $Ti_2AlN$ phase are observed. The electrical and thermal conductivity of $Ti_2AlN$ is higher than that of Ti6242 alloy. A machining test was carried out to compare the effect of material properties on micro electrical discharge drilling for $Ti_2AlN$ composite and Ti6242 alloy. Also, mixture table as a kind of tables of orthogonal arrays was used to know how parameter is main effective at experimental design. Consequently, hybrid $Ti_2AlN$ ceramic composites showed good machining time and electrode wear shape under micro ED-drilling process. This conclusion proves the feasibility in the industrial applications.
A. Hussain,안창원,H.J. Lee,I.W. Kim,J.S. Lee,S.J. Jeong,S.K. Rout 한국물리학회 2010 Current Applied Physics Vol.10 No.1
We have fabricated lead-free Bi0.5(Na0.75K0.25)0.5TiO3 (BNKT) ceramics by a conventional process (CP)and reactive templated grain growth (RTGG) methods. The effect of grain orientation on structure, dielectric,complex impedance and electrical properties was investigated. The phase formation and grain morphology of BNKT ceramics were examined by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. High dielectric constant and low dielectric loss was observed for grain oriented (textured) BNKT ceramics. Complex impedance, temperature dependent ac and dc conductivity were performed to explore the conduction behavior of the prepared BNKT ceramics.
Hussain, A.,Ahn, C.W.,Lee, H.J.,Kim, I.W.,Lee, J.S.,Jeong, S.J.,Rout, S.K. Elsevier 2010 CURRENT APPLIED PHYSICS Vol.10 No.1
We have fabricated lead-free Bi<SUB>0.5</SUB>(Na<SUB>0.75</SUB>K<SUB>0.25</SUB>)<SUB>0.5</SUB>TiO<SUB>3</SUB> (BNKT) ceramics by a conventional process (CP) and reactive templated grain growth (RTGG) methods. The effect of grain orientation on structure, dielectric, complex impedance and electrical properties was investigated. The phase formation and grain morphology of BNKT ceramics were examined by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. High dielectric constant and low dielectric loss was observed for grain oriented (textured) BNKT ceramics. Complex impedance, temperature dependent ac and dc conductivity were performed to explore the conduction behavior of the prepared BNKT ceramics.
Micro electrical discharge drilling characteristics of conductive SiC–Ti 2 CN composite
권준영,장성훈,권원태,김욱영 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.7
An electrically conductive SiC-Ti 2 CN composite was fabricated from β-SiC and TiN powders with 2 vol% equimolar Y 2 O 3 -Sc 2 O 3 additives by conventional hot-pressing. The composite (electrical resistivity of nearly 10 -4 Ω·cm) was wire electro discharge machined into a specimen having a thickness of 500 μm. Entrance clearance, machining time, number of shorts, material removal rate (MRR), counts, and the effects of the capacitance and voltage of conductive SiC-Ti 2 CN composite during micro electrical discharge drilling were measured and compared to those of SUS304. As the unit discharge energy increased, entrance clearance, machining time, and number of shorts decreased. A decrement in the number of shorts was the main reason for decrements in entrance clearance and machining time. MRR was proportional to unit discharge energy. The study to determine the location of shorts during electro discharge drilling was also conducted. It was founded that the short circuit occurred mainly at the beginning (0–1000 cts) because of low electrical density, and right before the exit (3000–5000 cts) owing to the difficulty of removing debris. Both the capacitance and voltage tended to be inversely proportional to the number of shorts.
Qin, Fen,Roh, Hee-Suk,Caliskan, Salim,Lee, Seongha,Kim, Sun-Dong,Woo, Sang Kook,Lee, Jung-Kun Elsevier 2019 Journal of the European Ceramic Society Vol.39 No.5
<P><B>Abstract</B></P> <P>We studied crystallization, grain growth and electric properties of La<SUB>0.8</SUB>Sr<SUB>0.2</SUB>MnO<SUB>3</SUB> (LSM) ceramics which were produced using the microwave-treatment. While co-precipitated nanoparticles remain mainly amorphous, the microwave irradiated particles are crystallized into LSM and La<SUB>2</SUB>Mn<SUB>2</SUB>O<SUB>7</SUB> at 550 °C, due to higher dielectric polarizability of La. This, in turn, decreases the amount of the second phase La<SUB>2</SUB>O<SUB>3</SUB> in calcined powder and promotes the growth of perovskite grains during sintering at 1400 °C. Larger grains of LSM ceramics lower the activation energy of small polaron hopping from 0.35 eV to 0.24 eV and increases high-temperature electric conductivity. In addition, high crystallinity of LSM ceramics from the microwave-treatment suppresses a chemical reaction with ZrO<SUB>2</SUB> and NiO in a temperature range of 900 – 1100 °C under oxidizing and reducing ambiances. These results show that LSM ceramics from the microwave-assisted reaction meet requirements for an interconnect layer for solid oxide electrolysis cells.</P>
Agus Edy Pramono,Mochamad Bayu Taufik Firdaus,Windrayo Ratriomasyo,Muhammad Zaki Nura,Johny Wahyuadi M. Soedarsono 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.10
Carbon ceramic composites of local materials from coconut coir waste with clay matrix or organoclay have been successfully fabricated. The composites have successfully demonstrated the thermal and electrical conductive properties. The research variables are composition ratio of 1 : 10, 2 : 10, and 3 : 10% weight, and sintering temperature of 800 o C, 900 o C and 1000 o C. The higher the content of the coconut coir powder the higher the electrical conductivity the composite produces. Likewise, the higher the composite sintering temperature, the higher the electrical conductivity of the composite. The electrical conductivity value of the optimal carbon ceramic composite is produced by composites with a composition ratio of 1:30, at a sintering temperature of 900 o C. The higher the carbon contents, the lower the thermal conductivity of composite. Increased pyrolysis sintering temperatures do not increase the thermal conductivity of composites. The optimum value of thermal conductivity is generated by carbon ceramic composites at a pyrolytic sintering temperature of 900 o C, at a ratio of 1 : 10. In general, increasing sintering temperature does not change the composite density. Composite density tends to be constant to increase sintering temperature. Increasing the content of coconut coir powder, which turns into carbon, is shown to decrease composite density.
Properties of ceramic fabricated of synthetic carbon and organoclay based on carbon particle size
Agus Edy Pramono,R. Sugeng Mulyono,R. Grenny Sudarmawan,Muhammad Zaki Nura,Haolia Rahman,Nanik Indayaningsih 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.4
The electrical and thermal conductivity properties of ceramics fabricated from carbon powder and clay have been studied. Thisstudy was designed by varying the particle size of carbon powders of mesh 150; 200; 250; 300; 350, with a carbon-organoclayratio of 30: 70% by weight, 200 bar compacting, and sintering of 950; 1000; 1050 °C. Electrical conductivity, thermalconductivity, specific wear rate, density/porosity, and ceramic morphology have been studied. The thermal conductivity followsthe tendency of electrical conductivity, because of the effect of carbon particle size. Increased sintering temperatures tend todecrease wear resistance. The smaller the particle size of carbon powder, it tends to increase the wear rate and the density ofcarbon-ceramic experiences relatively small changes. Porosity tends to follow density, even though the size of carbon particlesgets smaller. The occurrence of porous and cracking is more due to the irregular shape of carbon and matrix particles.
차세대 반도체 소자용 세라믹 박막의 전기적 분석 방법 리뷰
이동현(Donghyun Lee),양건(Kun Yang),박주용(Ju-Yong Park),박민혁(Min Hyuk Park) 한국세라믹학회 2019 세라미스트 Vol.22 No.4
Ceramic thin films are key materials for fundamental electronic devices such as transistors and capacitors which are highly important for the state-of-the-art electronic products. Their characteristic dielectric properties enable accurate control of current conduction through channel of transistors and stored charges in capacitor electrodes. The electronic conduction in ceramic thin films is one of the most important part to understand the electrical properties of electronic device based on ceramic thin films. There have been numerous papers dealing with the electronic conduction mechanisms in emerging ceramic thin films for future electronic devices, but these studies have been rarely reviewed. Another interesting electrical characterization technique is one based on electrical pulses and following transient responses, which can be used to examine physical and chemical changes in ceramic thin films. In this review, studies on various conduction mechanisms through ceramic thin films and electrical characterization based on electric pulses are comprehensively reviewed.