scholarly journals Phase Transformation and Physical Properties of Al N-Co Film

2013 ◽  
Vol 25 (10) ◽  
pp. 5879-5880
Author(s):  
C.S. Oh ◽  
S.C. Kil ◽  
C.S. Han
Keyword(s):  
Phase Transformation ◽  
Physical Properties

Effect of MnO2 Impurity on the PZT-PMN System Ceramics for Piezoelectric Transformer

2008 ◽  
Vol 55-57 ◽  
pp. 189-192
Author(s):  
Y. Suwan ◽  
Anuson Niyompan ◽  
Rungnapa Tipakontitikul ◽  
Pitak Laoratanakul
Keyword(s):  
Dielectric Constant ◽  
Grain Size ◽  
Phase Transformation ◽  
Physical Properties ◽  
Temperature Dependence ◽  
Room Temperature ◽  
Piezoelectric Properties ◽  
Relative Dielectric Constant ◽  
Linear Shrinkage ◽  
Poling Process

The PZT-PMN ceramics system was derived from Pb(Zr0.5Ti0.5)O3 and Pb(Mg2/3Nb1/3)O3 based compositions those obtained via the columbite method. The effect of MnO2 addition on microstructure, physical properties and piezoelectric properties were investigated. In this study, the composition with PZT/PMN ratio of 1:1 was selected. To observe the effect of MnO2 adding, its concentration was varied in range 0-10 mol%. Green pellets were sintered at temperature 1250oC for 4 hours. For piezoelectric investigation, the ceramics pellets were subjected to a poling process. The XRD results show that there is no phase transformation observed for all sintered PZT-PMN samples with presence of MnO2. The SEM micrographs reveal that MnO2 can enhance sinterability as evidenced by lowering of porosity and increasing of grain size with increasing of MnO2 content. Increasing of linear shrinkage and apparent densities also confirmed such effect. Improvement of d33 from 28 to 114 pC/N could only found for MnO2 in range 0 to 4 mol%. For higher MnO2 content, there is only slightly increased. However, increasing of kp with increasing of MnO2 is clearly observed. While dielectric constant measured at room temperature and at frequency 1 kHz is higher for ceramics without MnO2 doping and it decreases with increasing MnO2 concentration. The temperature dependence of relative dielectric constant go to peak of value about 6000 at temperature around 180oC and shifting of these peaks with frequency can only be observed for samples with higher MnO2 content. This indicates a normal ferroelectric behavior for sample with lower MnO2 and there are converted to relaxor after MnO2 increased.

Study of Thermo-Physical Properties of Selected Nickel-Based Superalloys With Use of DTA Method

2012 ◽  
Author(s):  
Jana Dobrovska ◽  
Simona Zla ◽  
Frantisek Kavicka ◽  
Bedrich Smetana ◽  
Vlastimil Vodarek
Keyword(s):  
Phase Transformation ◽  
Physical Properties ◽  
Phase Transformations ◽  
Solidus Temperature ◽  
Experimental System ◽  
Reaction Scheme ◽  
Transformation Temperatures ◽  
Heating And Cooling ◽  
Temperature Heating ◽  
Thermo Physical Properties

The presented paper deals with study of thermo-physical properties of cast complex alloyed nickel based superalloys IN713LC, IN738LC and IN792-5A. In this work the technique of Differential Thermal Analysis was selected for acquisition and comparison of the phase transformation temperatures. The samples taken from superalloys in as received state were analysed at heating and cooling rates of 1, 5, 10, and 20 K/min using the experimental system Setaram SETSYS 18TM. Moreover, the transformation temperatures for zero heating/cooling rate were calculated. Based on a comparison of these temperatures it is possible to make the following conclusions: (i) The alloy IN792-5A has the highest temperature of solubility of the strengthening phase γ′ (1235°C); (ii) the highest liquidus temperature (heating) obtained by extrapolation was found in the alloy IN713LC (1349°C), the lowest solidus temperature (heating) was found for the alloy IN738LC (1212°C); (iii) At cooling an undercooling occurred in all alloys. In general it may be stated that the biggest under-cooling (TS, 47°C) was recorded in the alloy IN792 5A; (iv) The width of the interval of the heat treatment window was the biggest in alloy IN713LC (44°C); (v) The alloy IN738LC is characterised by the widest interval of melting (124°C) and solidification (134°C), while the alloy IN792 5A has the narrowest interval of melting (82°C) and at the same time almost the same interval of solidification as the alloy IN738LC (129°C); (vi) The obtained phase transformation temperatures were compared with the values of phase transformations temperatures calculated on the basis of established relationships. In order to obtain more precise description of the behaviour of Ni-based superalloys, during controlled heating/cooling of the initial material (as received state) during DTA analyses, all the samples of superalloys were subjected to a phase analysis using scanning electron microscopy. The course of phase transformations, in all the studied superalloys (IN713LC, IN738LC, IN792 5A) is likely to run according to the following reaction scheme (L = melt): L ↔ γ, L ↔ γ + MC, L ↔ γ/γ′, L ↔ γ + minority phases (such as M3B2, phase η), γ ↔ γ′.

scholarly journals Investigation on the physical properties and diffusion layer phase transformation at the interface of Sialon-Duplex Stainless-Steel bonding

2021 ◽  
Vol 15 (3) ◽  
pp. 8450-8458
Author(s):  
Mohamed Ahmed Rady ◽  
Patthi Hussain ◽  
Nagoor Basha Shaik ◽  
Balaji Bakthavatchalam
Keyword(s):  
Stainless Steel ◽  
Phase Transformation ◽  
Physical Properties ◽  
Duplex Stainless Steel ◽  
Diffusion Layer ◽  
Diffusion Bonding ◽  
Research Work ◽  
Hot Press ◽  
Press Bonding ◽  
And Diffusion

Joining SiALON to duplex stainless steel utilizes the properties of two materials which may provide an opportunity for distinctive applications. Ceramic is hard and operates at a high temperature but it is brittle whereas metal is tough but it can work at a low temperature. The benefits of the best properties of both materials can be utilized by joining them. The objectives of the research work are to investigate the physical properties and the phase transformation at the interface and at the inter-diffusion layer in between the SiAlON and duplex stainless steel. The experiment incorporated nitriding, then diffusion bonding the duplex stainless steel using the hot press. Bonding was carried out at 1200°C for the holding times of 30 minutes and 1 hour.  Metallography and micro analyses were conducted to achieve the above objectives. The study has demonstrated that 30 minutes joining time is sufficient to develop the thickness of the interface. However, 1 hour joining duration achieved cohesive and sound diffusion bonding of the SiAlON to duplex stainless steel. This is possible due to the formation of diffusion interlayer which accommodates the residual stress presence during cooling down process.

scholarly journals Stiffener Design to Maintain Line Heating Efficiency during the Lifting Process Considering Phase Transformation

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 119
Author(s):  
Hong-Jun Noh ◽  
Hun-Bong Lim ◽  
Hee-Chan Yoon ◽  
Young-Hwan Han ◽  
Hyun-Ik Yang
Keyword(s):  
Phase Transformation ◽  
Physical Properties ◽  
Plate Theory ◽  
Superposition Principle ◽  
Steel Structures ◽  
Local Model ◽  
Line Heating ◽  
Shipbuilding Industry ◽  
Heating Efficiency ◽  
Main Technique

In the shipbuilding industry, welding is the main technique used to join steel structures. There is a lifting process, post-welding, that can eliminate the correction effect of line heating. Line heating is reperformed after the lifting process. This can significantly delay the ship assembly process. Herein, we present a design method for installing a permanent stiffener to avoid the disappearance of the line heating effect during the lifting process. The change in physical properties due to heating and cooling of the line heating is calculated. The limiting stress, at which the effect of the line heating completely disappears, based on the inherent strain theory, is obtained. The phase fraction by the cooling rate is calculated using the continuous cooling transformation diagram and the Kiustinen–Marburgerm equation. Physical properties affected by the phase transformation are calculated, considering the physical properties and fraction of each phase. The square plate theory and superposition principle are used to construct a local model, with a stiffener, of the ship block. The stress caused by the shape of the stiffener and the distance between the stiffeners were calculated for the local model. The calculated stress and the limiting stress were compared to determine, for the expected line heating efficiency, the most acceptable stiffener design. Finally, to confirm the elimination of the problem, the designed stiffener is analyzed using the finite element method.

CARPENTER GLASS SEALING 27

Alloy Digest ◽  
2005 ◽  
Vol 54 (5) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Phase Transformation ◽  
Physical Properties ◽  
Iron Alloy ◽  
Fluorescent Lamps ◽  
Technology Corporation ◽  
Vacuum Tubes ◽  
Carpenter Technology Corporation

Abstract Carpenter Glass Sealing 27 is a ductile chromium-iron alloy that has been used for strong glass-to-metal seals in electronic and vacuum tubes, and incandescent and fluorescent lamps. It exhibits no phase transformation up to 1150 deg C (2100 deg F). This datasheet provides information on composition, physical properties, and elasticity. It also includes information on corrosion resistance. Filing Code: FE-136. Producer or source: Carpenter Technology Corporation.

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