The Effect of Heat Treatments on the Microstructure and Electrical Properties of A1/Tiw/Polycrystalline Si Contacts

1990 ◽  
Vol 202 ◽  
Author(s):  
S. Berger ◽  
Y. Komem ◽  
B. Z. Weiss
Keyword(s):  
Heat Treatment ◽  
Electrical Properties ◽  
Electrical Resistance ◽  
Heat Treatment Temperature ◽  
Schottky Diodes ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Electrical Measurements ◽  
Short Annealing ◽  
First Time

ABSTRACTThe effect of heat treatments on the microstrueture, composition and electrical properties of the Al/TiW/ Polycrystal1ine Si system was studied systematically for the first time. It was found that Al and Si diffuse through the grain boundaries of the TiW layer at 400°C. Subsequently, Si accumulates at the Al/TiW interface while Al diffuses into the po1ycrystal1ine Si. TiSi, TiSi2, Al3Ti, and WAl10 are formed only at the Al/TiW interface as a result of the heat-treatments for 30min at temperatures between 450 and 500°C. The sheet resistance, measured on the surface of the Al film, is constant up to 350°C and then increases with the heat treatment temperature at all times. The I–V curves are characteristic to Schottky diodes. The general dependece of the current on the applied voltage remains the same but the electrical resistance changes as a result of the heat-treatments. At the long annealing time(30min), the electrical resistance decreases with the heat-treatment temperature. However, at the short annealing times(10–60sec), it first incrsases(between 400 and 450°C) and then decreases (between 450 and 500°C). The results of the electrical measurements are correlated to the microstructural and compositional changes occured due to the heat treatments.

Research on Effect of Erbium Salt in the Anodization of Aluminum

2011 ◽  
Vol 413 ◽  
pp. 300-303
Author(s):  
Xiao Zhen Liu ◽  
Liang Wei Zhu ◽  
Gang Wang ◽  
Ling Ling Song ◽  
Xiao Yun Tang
Keyword(s):  
Heat Treatment ◽  
Acid Solution ◽  
Aluminum Oxide ◽  
Heat Treatment Temperature ◽  
Anodic Aluminum Oxide ◽  
Sulphuric Acid Solution ◽  
Treatment Temperature ◽  
Anodic Aluminum ◽  
First Time ◽  
Anodization Method

Erbium salt was used as additives for the first time in preparing anodic aluminum oxide (AAO) films to improve its performance. AAO films were prepared from a 15 vol. % sulphuric acid solution containing erbium salt by anodization method; the effects of concentration of erbium on microhardness and thickness of AAO film were researched, respectively. The effect of heat treatment temperature on structure of AAO film was researched. AAO films were characterized by XRD, EDAX and SEM techniques, respectively. The microhardness and thickness of AAO film were 378.5HV and 82μm respectively, which were higher 12.99% and 17.14% than those of the film prepared in electrolyte of nothing addition erbium salt respectively. The aperture of AAO film was more uniform and the surface of AAO film was smoother than those of films prepared in electrolyte of nothing addition erbium salt. The apertures of AAO film were in 25~30nm. There was not erbium in AAO film. AAO films were amorphous when heat treatment temperatures of AAO film were below 800°C, when heat treatment temperature of AAO film were 850°C and 1000°C respectively, and AAO films were γ-Al2O3and α-Al2O3film respectively.

scholarly journals Effect of Processing Parameters on the Thermal and Electrical Properties of Electroless Nickel-Phosphorus Plated Carbon Fiber Heating Elements

2020 ◽  
Vol 6 (1) ◽  
pp. 6
Author(s):  
Bo-Kyung Choi ◽  
Soo-Jin Park ◽  
Min-Kang Seo
Keyword(s):  
Heat Treatment ◽  
Electrical Properties ◽  
Heat Treatment Temperature ◽  
Treatment Time ◽  
Volume Resistivity ◽  
Treatment Temperature ◽  
Heat Treatment Time ◽  
Plating Bath ◽  
Infrared Thermal Imaging ◽  
Thermal And Electrical Properties

Carbon fibers (CFs) were plated with nickel-phosphorus (Ni-P) using an electroless plating process. The effects of the process parameters such as heat treatment temperature, heat treatment time, and the pH of the plating bath on electroless Ni-P plating were investigated. The structure, elemental composition, and thermal and electrical properties of Ni-P plated CFs (MCF) were characterized by X-ray diffraction (XRD), a four-probe volume resistivity tester, and an infrared thermal imaging camera, respectively. The XRD indicated the presence of amorphous and crystalline phases of Ni and Ni-P. The MCF were able to perform at high temperatures because of their higher thermal conductivity. A heat treatment temperature of 300 °C, a heat treatment time of 4 h, and a pH of 8.5 were found to be optimum for obtaining MCF with desirable thermal and electrical properties.

Effect of NaNbO3 Crystalline Aggregates on the Electrical Properties of SiO2-Na2O-Nb2O5 Glass-Ceramics

2006 ◽  
Vol 514-516 ◽  
pp. 274-279 ◽  
Author(s):  
Manuel P.F. Graça ◽  
Maria Gracinda Ferreira da Silva ◽  
Manuel A. Valente
Keyword(s):  
Heat Treatment ◽  
Electrical Properties ◽  
Heat Treatment Temperature ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Treated Sample ◽  
Dc And Ac Conductivity ◽  
Potential Applications ◽  
Quenching Method ◽  
Crystalline Aggregates

The presence of NaNbO3 crystallites in a glass matrix has scientific and technological interest due to their electrical properties and potential applications in microwave, pyroelectric and piezoelectric devices. A glass with the composition 60SiO2-30Na2O-10Nb2O5 (% mole) was prepared by the melt-quenching method. NaNbO3 microcrystallites were precipitated on the surface of the glass by heat-treatment. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, dc and ac conductivity measurements were used in the study of the glass and glassceramic materials. The number of particles, precipitated in the surface of the glass-ceramic samples, increases from the 650 to the 750°C and decrease in the 800°C sample. In all these samples the particles size thickness increases with the rise of the heat-treatment temperature. In the 750 and 800°C samples it was observed the presence of a white surface layer formed by NaNbO3 crystallites aggregations. The dc conductivity (σdc) decreases with the rise of the heat –treatment temperature up to 750°C and the dielectric constant value, at 1kHz and room temperature, has a maximum value of 34.94 for the 800 °C treated sample.

Effect of Neodymium Salt in the Anodization of Aluminum in Sulphuric Acid

2011 ◽  
Vol 415-417 ◽  
pp. 1895-1898 ◽  
Author(s):  
Xiao Zhen Liu ◽  
Jian Qiang Gen ◽  
Ai Bing Yu ◽  
Gang Wang ◽  
Ling Ling Song ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Acid Solution ◽  
Sulphuric Acid ◽  
Heat Treatment Temperature ◽  
Anodic Aluminum Oxide ◽  
Sulphuric Acid Solution ◽  
Treatment Temperature ◽  
Anodic Aluminum ◽  
First Time ◽  
Anodization Method

Neodymium salt was used as additives for the first time in preparing anodic aluminum oxide (AAO) films to improve its performance. AAO films were prepared by anodization method from a 15 vol. % sulphuric acid solution containing neodymium salt; the effects of concentration of neodymium on microhardness and thickness of AAO film were researched, respectively. The effect of heat treatment temperature on structure of AAO film was researched. AAO films were characterized by XRD, EDAX and SEM techniques. The microhardness and thickness of AAO film were 377.2HV and 85μm respectively, which were higher 12.60% and 21.43% than those of the film prepared in electrolyte of nothing addition neodymium salt, respectively. The surface of AAO film was smoother and the aperture of AAO film was more uniform than those of films prepared in electrolyte of nothing addition neodymium salt. The apertures of AAO film were in 25～30nm. There was not neodymium in AAO film. AAO films were amorphous when heat treatment temperatures of AAO film were below 800°C, heat treatment temperature of AAO film were 850°C and 1000°C respectively, AAO films were γ-Al2O3and α-Al2O3film respectively.

scholarly journals Modified Solution Annealing Heat Treatments of Powder Bed Fused Inconel 718

2021 ◽  
Author(s):  
Ala'aldin Alafaghani ◽  
Muhammad Ali Ablat ◽  
Ala Qattawi
Keyword(s):  
Heat Treatment ◽  
Inconel 718 ◽  
Heat Treatment Temperature ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Slight Reduction ◽  
Solution Annealing ◽  
Microscopy Imaging ◽  
Wide Range ◽  
Anisotropic Mechanical Properties

Abstract Inconel 718 (IN718) is a superalloy commonly used in aerospace, turbomachinery, and applications with extreme conditions due to its creep and corrosion resistance and high strength and hardness at a wide range of temperatures. The recent development of metal additive manufacturing offers a new approach to fabricate complex IN718 parts with minimal machining. However, additively manufactured IN718 parts suffer from anisotropic mechanical properties and are usually inferior to conventionally produced parts. This is especially noticeable under dynamic loading conditions, where they suffer from lower fatigue strength and life in addition to lower reliability. This study focuses on post-processing heat treatments that aim to homogenize the microstructure of the additively manufactured IN718 and reduce the defects produced during fabrication. In this work, we developed modified solution annealing treatments for IN718 samples, followed by tensile testing. X-ray diffraction and scanning electron microscopy imaging were used to evaluate the microstructure. The results show that by increasing the initial heat treatment temperature, better isotropy, Young’s modulus, and ductility were produced at the cost of a slight reduction in the tensile strength. The further rise in the heat treatment temperature increased the grain size significantly and produced unfavourable precipitate morphology, which caused a brittle behaviour.

Effect of Praseodymium Salt on Properties of Anodic Aluminum Oxide Films

2011 ◽  
Vol 399-401 ◽  
pp. 847-850 ◽  
Author(s):  
Xiao Zhen Liu ◽  
Zhao Xin Liu ◽  
Ai Bing Yu ◽  
Gang Wang ◽  
Ling Ling Song ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Aluminum Oxide ◽  
Sulphuric Acid ◽  
Heat Treatment Temperature ◽  
Anodic Aluminum Oxide ◽  
Sulphuric Acid Solution ◽  
Treatment Temperature ◽  
Anodic Aluminum ◽  
Α Al2o3 ◽  
First Time

Praseodymium salt was used as additives for the first time in preparing anodic aluminum oxide (AAO) films to improve its performance. AAO films were prepared by anodization method from a 15 vol.% sulphuric acid solution containing praseodymium salt. The effects of Pr concentration on microhardness and thickness of AAO film were investigated, respectively. The effect of heat treatment temperature on structure of AAO film was investigated. AAO films were characterized by XRD, EDAX and SEM techniques. AAO films showed higher microhardness and thickness, the surface of AAO film was smoother and the aperture of AAO film was more uniform than those of films prepared in 15 vol. % sulphuric acid anodization solution. The microhardness and thickness of AAO film were 355.7HV and 84μm respectively. The apertures of AAO film were in 25～30nm. There was not praseodymium in AAO film. AAO films were amorphous when heat treatment temperatures of AAO film were below 800°C. When heat treatment temperature of AAO film were 850°C and 1000°C respectively, AAO films were γ-Al2O3 and α-Al2O3 film respectively.

scholarly journals An Experimental Study on the Slippage Effects of Sandstone under Confining Pressure and Low Pore Pressure Conditions

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Zhengdai Li ◽  
Jianping Zuo ◽  
Yue Shi ◽  
Fei Xu ◽  
Meilu Yu ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Pore Pressure ◽  
Wave Velocity ◽  
Heat Treatment Temperature ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Slippage Effect ◽  
Temperature Heat ◽  
The Impact

Due to the influences of various factors, such as temperature, stress, and composition, the research regarding rock permeability has been complicated. This study examined the variation laws of sandstone specimens under changing rates of confining and pore pressures after high-temperature heat treatments. The results showed that the free water in the rock volatilized during the low-temperature heat treatments in the range of 100°C to 300°C, with the increase of the heat-treatment temperature above 500°C; the crystal water in the rock is gradually separated out; and the particles in the samples had undergone phase transformations resulting in increased permeability. According to ultrasonic wave velocity test results, the internal cracks of the samples expanded with the increases in the heat-treatment temperatures. In addition, the high-temperature heat treatments were found to improve the accuracy of the direction of the Earth’s stress when using circumferential wave velocity anisotropy methods. Under the influence of slippage effects, as the pore pressure increased, the measured permeability of the samples decreased and the slippage effect occurs in the rock samples with the permeability of 10-3 μm2~10-6 μm2. The experimental results showed that the contribution rate of the slippage effect decreases with the increase of the heat-treatment temperature of the specimen, and the contribution rates of the sandstone slippage effect were generally higher than 5%. Therefore, the impact effects on the permeability of sandstone slippage should be considered in practical engineering processes.

Study on the Crimp Property of PTT/PET Bicomponent Filament

2013 ◽  
Vol 781-784 ◽  
pp. 2680-2684
Author(s):  
Kan Lai ◽  
Mei Yu Chen ◽  
Run Jun Sun ◽  
Hong Sun
Keyword(s):  
Heat Treatment ◽  
Water Treatment ◽  
Heat Treatment Temperature ◽  
Treatment Time ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Heat Treatment Time ◽  
Boiling Water ◽  
Component Ratio

In this work, the crimp properties of PTT/PET bicomponent filament with different component ratios were investigated. The results show that, after boiling water treatment for 15 minutes, the crimpability of 50/50 component ratio is superior to that of 40/60 and 60/40 component ratio. Heat treatment can realize the shrinkage difference of the two components in a biocomponent filament and enable the biocomponent filament to have good crimpability and bulkiness. In addition, different heat treatments, heat treatment time and heat treatment temperature can also bring different crimp effects to the biocomponent filaments.

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