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P-6.11: Sensor Technology - A new chance for low generation TFT production line
摘要： We analyzed several sensor technology which have good compatibility with current TFF process, including Digital X-Ray Detector, Glass-substrate Pressure Sensor, Glass-substrate Memory, Glass-substrate Antenna and Glass-substrate MEMS Devices. The above offers some directions for low generation TFT production line’s transition.
关键词： Glass-substrate Memory,Digital X-Ray Detector,Glass-substrate MEMS Devices,Glass-substrate Pressure Sensor,Glass-substrate Antenna
更新于2025-09-09 09:28:46
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[Micro/Nano Technologies] Micro and Nano Fabrication Technology Volume 1 || Precision Molding of Microstructures on Chalcogenide Glass for Infrared Optics
摘要： Chalcogenide glass (ChG), as an alternative material in place of single-crystal germanium, is increasingly used in thermal imaging, night vision, and infrared guidance systems, etc., and microstructure array on the infrared component is widely used in micro-optical systems owing to their excellent formability through precision glass molding (PGM), which can achieve low cost and high efficiency compared with other microstructural manufacturing technologies. To describe the thermomechanical properties of ChG, the viscoelastic constitutive of ChG is modeled and used in finite element simulation to study the influence of process parameters on the forming stress. The processing parameters are studied to reduce the occurrence of microdimples and optimize the molding conditions. Finally, microstructure arrays are molded using spherical ChG preform and the optimal molding materials are identified.
关键词： Microdimples,Finite element simulation,Precision glass molding,Microstructure array,Chalcogenide glass
更新于2025-09-09 09:28:46
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Photocured characteristics of fast photocurable acrylic formulations and investigations by differential photo calorimeter
摘要： Bisphenol-A glycerolate diacrylate has been synthesized, characterized and formulated with acrylate monomers. Photocrosslinking characteristics of UV-curable acrylate monomers were investigated with the help of differential photocalorimeter equipped with UV radiometer using UV radiation of 365 nm at an intensity of 10 mWcm-2. The heat of photoreaction, curing rate and degree of conversion were studied using theoretical kinetic equations to investigate the effect of 2-ethylhexyl acrylate on photocuring behaviour of bisphenol-A glycerolate diacrylate, acrylic acid and methyl methacrylate. Curing rate reached its maximum value within 7.5 s, and more than 70% monomers were photopolymerized in all the formulations. Enthalpy of photopolymerization was found in the range of - 206 to - 171 J g-1, and maximum degree of conversion attained was 82–84% within a time span of 25 s. A comparison of DPC curves reveals that 2-ethyl hexyl acrylate has no significant effect on the curing rate of photopolymerization, however, a small decrease in degree of conversion was observed. Further, FTIR quantification of C=C bond conversion was performed in order to estimate the degree of conversion after 25 s. Specific gravity and mechanical properties of the casted films have also been reported. Glass transition temperatures were also recorded with the help of DSC, and a remarkable shift from 40.52 to 23.48 °C was observed imparting flexibility to the UV-cured compositions. The developed photocurable acrylic formulations have been used for preparation of laminated glasses which were analysed for fracture and adhesion test.
关键词： 2-Ethyl hexyl acrylate,Photopolymerization,DSC,UV curing,Glass transition,Laminated glass
更新于2025-09-09 09:28:46
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White light-emitting Dy <sup>3+</sup> -doped transparent chloroborosilicate glass: synthesis and optical properties
摘要： Dy3+-doped chloroborosilicate glasses with the composition 35.7SiO2-25.5B2O3-17BaO-3.4K2O-3.4Al2O3-15BaCl2 (mol%) were prepared using melt quenching technique. The glass transition temperature (Tg) was ~610°C. In UV-Vis-NIR absorption spectra characteristic absorption bands of Dy3+ appeared at 322, 347, 364, 388, 795 and 880 nm due to spectral transitions from the 6H15/2 level to various higher levels of Dy3+ ion. The excitation spectrum was recorded at within 200–550 nm by monitoring emissions at 576 nm. The excitation bands at 392, 428, 453 and 472 nm were attributed to the 6H15/2 → 4I13/2, 4G11/2, 4I15/2 and 4F9/2 transitions, respectively. Prominent emission bands were observed at wavelengths of 484, 576, 664 and 754 nm when excited at 447 nm. The bands correspond to the transitions 4F9/2→6H15/2, 4F9/2 → 6H13/2, 4F9/2 → 6H11/2, and 4F9/2 → 6H9/2 6F11/2 respectively. The emitted light from all the samples were found to be white. Their colour coordinates lie within the white range. The sample containing 0.5 wt% Dy2O3 emitted white light with the colour coordinates x=0.351, y=0.335, which are the very closest to pure white light and whose colour temperature of 4716 K is similar to daylight. Such white light-emitting transparent glasses promise to be enormously useful for various photonic applications.
关键词： white light generation,chloroborosilicate glass,Dy3+-doped glass,photoluminescence,absorption spectra
更新于2025-09-09 09:28:46
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Thermal behaviour of poly(methyl methacrylate)/fullerene composite films
摘要： Poly(methyl methacrylate)/fullerene composite films were fabricated by casting from toluene solutions. The mass fraction of fullerene (C60) was varied from 0.05–3 wt. %. The effect of the fullerene (C60) content on the thermal degradation parameters of the composite films was evaluated by thermogravimetric (TG) analysis. It was found that the incorporation of C60 improved the thermal stability of the polymers. The films eventually decomposed in three stages. Incorporation of fullerene caused a change in the distribution of mass loss over the stages of degradation in comparison with the pristine polymer. Using differential scanning calorimetry (DSC), the phase transitions from the glassy state to the elastic one was studied for the examined polymeric materials. New data relating to the effect of C60 on the glass transition temperature of composites with low weight fractions of filler were obtained. Specifically, for films containing up to 0.1 wt. % of C60, a single glass transition temperature was found, whereas for composites with a higher concentration of filler, two glass transition temperatures were recorded.
关键词： Composite materials,thermogravimetric (TG) analysis,glass transition,DSC,fullerenes,thermal stability
更新于2025-09-09 09:28:46
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The effect of Nb2O5 on fast neutron removal cross section, optical, and structural properties of some calcium borate oxide glasses containing Bi3+ ions
摘要： Background In recent years, the preparation of transparent glass in the visible region has led to the development of radiation shielding materials with measuring structure and optical properties. Also, the study on the interaction of neutron radiation with matter is important in the field of radiation protection. Purpose Preparation of transparent calcium and bismuth borate oxide glasses containing Nb5+ ions can be used as a neutron radiation shield and determine refractive index with different methods for this glass. Methods Niobium bismuth borate glasses with composition 60B2O3–20CaO–(20 ? x)Bi2O3–xNb2O5, where (x is in mol%, 0 ≤ x ≤ 10), have been prepared using conventional melt-quenching technique; the structure of each sample was studied by XRD, FTIR, and UV spectra chart analysis. Results XRD and FTIR showed that all glass samples were highly homogeneous and had structured with short-range-order/amorphous solids. The refractive index of each sample was estimated by charts of UV–Vis and FTIR, in addition to an empirical method, and we obtained values very close to each other. The refractive index values are relatively high, so this glass can be used in nonlinear studies as well as luminescence characterization. The macroscopic fast neutron removal cross sections ((cid:2)R/ρ) have calculated, for all samples, and the highest value was in sample containing 2.5% niobium pentoxide. Conclusion Bismuth borate glass containing a few niobium pentoxide can be used as a protective shield of neutrons.
关键词： Borate glass,Refractive index,UV–Vis,Oxide glasses,Optical properties
更新于2025-09-09 09:28:46
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On-machine texturing of PCD micro-tools for dry micro-slot grinding of BK7 glass
摘要： While using diamond micro-tools for micro-grinding, tool re-clamping errors and low chip removal space from machining zone are the primary factors which cause large vibrations, higher grinding forces and poor surface quality. On-machine tool preparation and tool texturing prior to micro-grinding can reduce tool re-clamping error. It can further help to reduce the tool-workpiece contact area along with enhanced chip removal from the machining zone speci?cally essential during dry micro-grinding as usage of the cutting ?uid should be minimized or completely avoided for environmental aspects. In this study, end faces of polycrystalline diamond (PCD) micro-tools have been on-machine textured using micro electro-discharge machining (micro-EDM) process. Four types of textured tools are envisaged viz. tool with one micro-cavity at the center of the end face (T2), one micro-groove along the end face diameter (T3), two intersecting micro-grooves at the end face (T4) and four intersecting micro-grooves at the end face (T5). A new term “contact area ratio” is de?ned to explain the texture dimension on the end face of the micro-grinding tools. Performances of di?erent micro-textured tools (T2, T3, T4 and T5) with respect to a normal commercial tool (T1) in terms of grinding force, surface roughness and micro-slot quality are investigated for micro-slot grinding of BK7 glass. It is observed that micro-textured micro-grinding tool e?ciently serves the purpose of provisional chip collection in passive grinding areas of the tool whereas chip adhesion or wear on the active grinding areas signi?cantly gets reduced as compared to un-textured tools. Maximum reductions in the x and y direction forces are observed with tool type T5 compared to all other tool types. Reduction in z direction force is comparable for both tool types T2 and T3. Average surface roughness decreased from tool type T1 to type T2, T3 and up to tool type T4 whereas it again increased for tool type T5. The current study shows that textured micro-grinding tools are capable of reducing high normal forces, surface roughness and material dragging which are major concerns during micro-grinding with ?at-end poly-crystalline diamond tools.
关键词： Polycrystalline diamond tool,Micro-texture,Micro-grinding,BK7 glass,Surface roughness,Grinding force,Micro-EDM
更新于2025-09-09 09:28:46
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Piezoelectric-Based Support Transducer Design to Enable High-Performance Bulk Mode Resonators
摘要： An innovative topology to realize high-performance bulk mode devices made up of low-defect material by driving them into resonance using piezoelectric thin-film transduction is proposed and implemented in this paper. Here, the piezoelectric transducer is uniquely positioned at the bulk mode’s support location. To realize the resonators, MEMSCAP Inc.’s PiezoMUMPS platform was utilized. Wine-glass and Lamé bulk mode devices are demonstrated to establish the feasibility of the support transducer drive/sense mechanism. Several drive/sense combinations of the balanced–unbalanced setup were measured. For the differential-in differential-out configuration, reduced feedthrough and enhanced stop-band rejection was observed. As a result, the Wine-glass and Lamé mode resonators having a resonance frequency ( fr ) of 20.943 and 21.15 MHz with a motional resistance (Rm) of 1.68 and 3.88 kΩ and a loaded quality factor ( Ql ) of 9940 and 6840, respectively, operating in vacuum at 0-dBm driving power are demonstrated. Temperature Coefficient of Frequency of ?26.4 and ?25 ppm/K is recorded for Wine-glass and Lamé mode resonators, respectively. To characterize the closed-loop response of the devices, they were connected to a lock-in amplifier with phase-locked loop, and a phase noise of ?122 and ?118 dBc/Hz at 1-kHz offset were measured for Wine-glass and Lamé mode resonators, respectively.
关键词： Bulk mode,wine-glass,transducer,differential-in,piezoelectric,Lamé mode,differential-out,phase noise,temperature coefficient of frequency
更新于2025-09-09 09:28:46
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Nano-layered-structure interface between Sn-Ti alloy and quartz glass for hermetic seals
摘要： The interface structure between Sn-Ti alloy and quartz glass was investigated by transmission electron microscope. The results show that the interface is continuous and dense and has a nano-layered-structure with thickness of several tens of nanometer without holes and cracks. The interface is divided into two layers. One is the TiO2 layer with a thickness of about 2 nm locates near Sn-Ti alloy, and the other is a multiphase structure layer near the quartz glass composed of nanocrystalline TiSi2, Ti5Si3 and TiO2.
关键词： Interface,Quartz glass,Microstructure,Sn-Ti alloy
更新于2025-09-09 09:28:46
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Mechanical properties of Zr-based bulk metallic glass parts fabricated by laser-foil-printing additive manufacturing
摘要： The application of bulk metallic glasses (BMGs) has been traditionally limited to parts with small dimensions and simple geometries, due to the requirement of fast cooling during the conventional process of casting. This research exemplifies a promising additive manufacturing method, i.e., laser-foil-printing (LFP), to fabricate high-quality BMG parts with large dimensions and complex geometries. In this study, Zr52.5Ti5Al10Ni14.6Cu17.9 BMG parts were fabricated by LFP technology in which MG foils are laser welded layer-by-layer upon a substrate. The mechanical properties of the fabricated BMG parts were measured using micro-indentation, tensile test and four-point bending test, and compared to as-cast BMG parts. Through LFP, as rapid cooling rates can be achieved, fully amorphous and nearly fully dense BMG parts without cracking have been successfully made. The glass transition temperature, crystallization temperature, and melting temperature of the fabricated parts are nearly the same as those of the as-cast parts. Additionally, the fabricated BMG parts exhibit mechanical properties, including micro-hardness, tensile strength, and flexural strength, comparable to the as-cast BMG parts.
关键词： laser processing,additive manufacturing,bulk metallic glass,mechanical properties
更新于2025-09-09 09:28:46