Isothermal oxidation properties of pure copper

1990 ◽  
pp. 43-54 ◽  
Author(s):  
C. Zhou ◽  
W.W. Smeltzer
Keyword(s):  
Pure Copper ◽  
Isothermal Oxidation ◽  
Oxidation Properties

In situ Raman spectroscopy study on the effect of antioxidants on high temperature oxidation properties of TMPTO

2019 ◽  
Vol 71 (5) ◽  
pp. 706-711 ◽  
Author(s):  
Bingxue Cheng ◽  
Haitao Duan ◽  
Yongliang Jin ◽  
Lei Wei ◽  
Jia Dan ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
High Temperature ◽  
Thermal Oxidation ◽  
High Temperature Oxidation ◽  
Isothermal Oxidation ◽  
In Situ Raman Spectroscopy ◽  
Temperature Oxidation ◽  
Content Type ◽  
Structure Changes ◽  
Oxidation Properties

Purpose This paper aims to investigate the thermal oxidation characteristics of the unsaturated bonds (C=C) of trimethylolpropane trioleate (TMPTO) and to reveal the high temperature oxidation decay mechanism of unsaturated esters and the nature of the anti-oxidation properties of the additives. Design/methodology/approach Using a DXR laser microscopic Raman spectrometer and Linkam FTIR600 temperature control platform, the isothermal oxidation experiments of TMPTO with or without 1.0 wt. % of different antioxidants were performed. Findings The results indicated that the Raman peaks of =C-H, C=C and -CH2- weaken gradually with prolonged oxidation time, and the corresponding Raman intensities drop rapidly at higher temperatures. The aromatic amine antioxidant can decrease the attenuation of peak intensity, as it significantly reduces the rate constant of C=C thermal oxidation. The hindered phenolic antioxidant has a protective effect during the early stages of oxidation (induction period), but it may accelerate the oxidation of C=C afterwards. Originality/value Research on the structure changes of synthetic esters during oxidation by Raman spectroscopy will be of great importance in promoting the use of Raman spectroscopy to analyze the oxidation of lubricants.

Microstructure evolution and isothermal oxidation properties of c-AlPO4 and SiC whisker co-modified mullite coated SiC-C/SiC composites

2019 ◽  
Vol 45 (16) ◽  
pp. 20704-20713 ◽  
Author(s):  
Dongmei Pu ◽  
Pengju Chen ◽  
Peng Xiao ◽  
Zhuan Li ◽  
Zeyan Liu ◽  
...  
Keyword(s):  
Microstructure Evolution ◽  
Isothermal Oxidation ◽  
Oxidation Properties ◽  
Sic Composites

Corrosion and Oxidation Protection of Ti6Al4V Alloy by an Inorganic Metal Modified Silicate Composite Coating

2010 ◽  
Vol 654-656 ◽  
pp. 1952-1955 ◽  
Author(s):  
Cheng Wang ◽  
Sheng Long Zhu ◽  
Fu Hui Wang
Keyword(s):  
Thermal Shock ◽  
Composite Coating ◽  
Salt Spray ◽  
Mass Gain ◽  
Isothermal Oxidation ◽  
Ti6al4v Alloy ◽  
Coated Alloy ◽  
Oxidation Properties ◽  
Oxidation And Corrosion ◽  
Corrosion And Oxidation

An inorganic metal modified silicate composite coating was developed to protect the corrosion and oxidation of Ti6Al4V alloy at 650°C. The properties of the coatings were investigated by oxidation and corrosion experiments, and the microstructure of the coatings was studied by SEM. The isothermal oxidation results indicated that the Ti6Al4V alloy suffered serious oxidation after exposed for 100h at 650°C and the mass of the alloy gained almost lineally, while the coated alloy had almost no mass gain and the coatings keep intact after oxidation. The salt spray test for 20h and oxidation at 650°C for 2h was carried out to investigate the corrosion and oxidation properties of the coatings. The results indicated that the alloy experienced serious corrosion after experiment for 20 cycles, while the coated alloy did not corrode after the experiments. The thermal shock experiments indicated that the coatings could withstand 50 times thermal shock when kept for 5min at 700°C and then immediately put into 3.5%NaCl solution at room temperature.

Oxidation Behavior of TiC/ Fe Ceramics Produced by Self-Propagating High-Temperature Synthesis

2010 ◽  
Vol 434-435 ◽  
pp. 116-119 ◽  
Author(s):  
Bin Li ◽  
Zong De Liu ◽  
Li Ping Zhao ◽  
Yan Rong Bao
Keyword(s):  
High Temperature ◽  
Synthesis Method ◽  
Isothermal Oxidation ◽  
Composite Ceramics ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Oxidation Properties ◽  
Kinetics Of ◽  
Static Pressing

The key problem about the application of TiC/Fe composite ceramics in high temperature is the oxidation resistance. With an aim to investigate oxidation properties, the high density TiC/Fe ceramics was produced by self-propagating high-temperature synthesis method combined with pseudo hot iso-static pressing (SHS/PHIP). The oxidation kinetics of TiC/Fe ceramics were investigated by means of conducting the isothermal oxidation experiments in air at temperature of 550°C  900°C for up to 150 hours, and measuring the variations of the weight gains of the composites with the oxidation times. The microstructure evolution of the composites during the oxidation processing was studied by using SEM/EDS and XRD. Experimental results show that TiC/Fe ceramics basically follows a parabolic rule at high temperature. A detailed characterization of the microstructure and distribution of the phases within the scale following oxidation studies has been undertaken to suggest the possible mechanism for the oxidation of TiC/Fe ceramics.

Preparation, Characterization and Oxidation Mechanism Study of Biomorphic Porous Carbon Coated with SiC Gradient Coating

2009 ◽  
Vol 610-613 ◽  
pp. 211-214
Author(s):  
Ming Jian Wu ◽  
Peng Zhao Gao ◽  
Yan Li Liu ◽  
Han Ning Xiao
Keyword(s):  
Kinetic Parameters ◽  
Porous Carbon ◽  
Oxidation Mechanism ◽  
Isothermal Oxidation ◽  
Carbon Surface ◽  
Mechanism Study ◽  
Porous Network ◽  
Carbon Coated ◽  
Oxidation Properties ◽  
Line Scanning

A biomorphic porous carbon coated with gradient SiC coating (SiC/BPC) was prepared by controlled carbonizing native pine under Ar atmosphere and then processed with precursor infiltration-pyrolysis (PIP) of organosilan. Microstructure and component of SiC/BPC were performed by SEM, EDS (attached with line scanning program) and XRD. The non-isothermal oxidation properties and mechanism of SiC/BPC were studied by TGA. The kinetic parameters were calculated through model-functions methods. Experimental results showed that SiC/BPC has a topologically uniform interconnected porous network microstructure, the SiC coating was amorphous and combines well with the carbon surface, which improved the oxidation resistance of BPC material about 150K. The non-isothermal oxidation reaction of SiC/BPC exhibited the characteristic of self-catalytic, the oxidation mechanism of SiC/BPC was 2-D diffusion, decelerator -t curve, the kinetic parameters are lgA/min-1= 15.483；E/kJ•mol-1 = 287.49.

Preparation and Oxidation Properties of Carbon/Carbon Composites with the Antioxidant SiC/NiCS Coating

2017 ◽  
Vol 727 ◽  
pp. 881-888
Author(s):  
Yi Li ◽  
Fan Hao Zeng ◽  
Ji An Liu ◽  
Zhi Huan Zou ◽  
Yi Gu
Keyword(s):  
Oxidation Resistance ◽  
Transition Layer ◽  
Bending Strength ◽  
Retention Rate ◽  
Isothermal Oxidation ◽  
Carbon Composites ◽  
Before And After ◽  
Oxidation Properties ◽  
Short Time ◽  
Strength Retention

In the paper, the SiC/NiCS coating on carbon/carbon composites was designed and prepared, and its oxidation properties was investigated. The SiC transition layer is prepared by embedding method while the NiCS coating by brushing slurry. Oxidation resistance of various coatings and the same coating sintered by different ways are analyzed through the isothermal oxidation experiment. The strength retention of the samples after oxidation is tested through the three-point bending experiment. The surface and cross section morphology of the coating before and after oxidation are observed by SEM, and crystalline phases of the coating are analyzed by XRD. According to the results, the coating have excellent short-time oxidation resistance, and the weightless rate with oxidation time presents linear increasing trend basically. With the increase of temperature, the weight-loss rate increases. The more serious oxidation is, the lower bending strength retention rate is. The integrity and density of the barrier layer and the across-running cracks of the silicon carbide transition layer are the main factors influencing the oxidation resistance of the sample.

TEM study of a biofilm on copper corrosion

1996 ◽  
Vol 54 ◽  
pp. 220-221
Author(s):  
W. A. Chiou ◽  
N. Kohyama ◽  
B. Little ◽  
P. Wagner ◽  
M. Meshii
Keyword(s):  
Marine Bacterium ◽  
Culture Medium ◽  
Copper Alloys ◽  
Pure Copper ◽  
Localized Corrosion ◽  
Natural Seawater ◽  
Copper Corrosion ◽  
New Approach ◽  
The Past ◽  
Copper Tolerant

The corrosion of copper and copper alloys in a marine environment is of great concern because of their widespread use in heat exchangers and steam condensers in which natural seawater is the coolant. It has become increasingly evident that microorganisms play an important role in the corrosion of a number of metals and alloys under a variety of environments. For the past 15 years the use of SEM has proven to be useful in studying biofilms and spatial relationships between bacteria and localized corrosion of metals. Little information, however, has been obtained using TEM capitalizing on its higher spacial resolution and the transmission observation of interfaces. The research presented herein is the first step of this new approach in studying the corrosion with biological influence in pure copper.Commercially produced copper (Cu, 99%) foils of approximately 120 μm thick exposed to a copper-tolerant marine bacterium, Oceanospirillum, and an abiotic culture medium were subsampled (1 cm × 1 cm) for this study along with unexposed control samples.

Integration of pure copper to optimize heat dissipation in injection mould inserts using laser metal deposition

2021 ◽  
Vol 33 (1) ◽  
pp. 012029
Author(s):  
Stefan Polenz ◽  
Christian Kolbe ◽  
Florian Bittner ◽  
Elena López ◽  
Frank Brückner ◽  
...  
Keyword(s):  
Heat Dissipation ◽  
Pure Copper ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Injection Mould

Enhancement of EDM Performance by Using Copper-Silver Composite Electrode

2020 ◽  
Vol 38 (9A) ◽  
pp. 1352-1358
Author(s):  
Saad K. Shather ◽  
Abbas A. Ibrahim ◽  
Zainab H. Mohsein ◽  
Omar H. Hassoon
Keyword(s):  
Surface Roughness ◽  
Material Removal Rate ◽  
Material Removal ◽  
High Speed ◽  
Composite Electrode ◽  
Removal Rate ◽  
Pure Copper ◽  
High Speed Steel ◽  
Pulse On Time ◽  
Pulse Off Time

Discharge Machining is a non-traditional machining technique and usually applied for hard metals and complex shapes that difficult to machining in the traditional cutting process. This process depends on different parameters that can affect the material removal rate and surface roughness. The electrode material is one of the important parameters in Electro –Discharge Machining (EDM). In this paper, the experimental work carried out by using a composite material electrode and the workpiece material from a high-speed steel plate. The cutting conditions: current (10 Amps, 12 Amps, 14 Amps), pulse on time (100 µs, 150 µs, 200 µs), pulse off time 25 µs, casting technique has been carried out to prepare the composite electrodes copper-sliver. The experimental results showed that Copper-Sliver (weight ratio70:30) gives better results than commonly electrode copper, Material Removal Rate (MRR) Copper-Sliver composite electrode reach to 0.225 gm/min higher than the pure Copper electrode. The lower value of the tool wear rate achieved with the composite electrode is 0.0001 gm/min. The surface roughness of the workpiece improved with a composite electrode compared with the pure electrode.

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