Development of Self-lubricating Nickel Based Composite Clad using Microwave Heating in Improving Resistance to Wear at Elevated Temperatures

2021 ◽  
Author(s):  
G. Suresh ◽  
M. R. Ramesh ◽  
M. S. Srinath
Keyword(s):  
Microwave Heating ◽  
Elevated Temperatures ◽  
Resistance To Wear

BERYLCO 25S

Alloy Digest ◽  
1952 ◽  
Vol 1 (3) ◽  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Precipitation Hardening ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
Good Resistance ◽  
Subzero Temperatures ◽  
Endurance Strength ◽  
Wear And Corrosion ◽  
Resistance To Wear

Abstract Berylco 25S alloy is the high-performance beryllium-copper spring material of 2 percent nominal beryllium content. It responds to precipitation-hardening for maximum mechanical properties. It has high elastic and endurance strength, good electrical and thermal conductivity, excellent resistance to wear and corrosion, high corrosion-fatigue strength, good resistance to moderately elevated temperatures, and no embrittlement or loss of normal ductility at subzero temperatures. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-3. Producer or source: Beryllium Corporation.

AL TECH HTB-2

Alloy Digest ◽  
1983 ◽  
Vol 32 (9) ◽  
Keyword(s):  
Fracture Toughness ◽  
High Speed ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
High Hardenability ◽  
Good Oxidation Resistance ◽  
Temperature Performance ◽  
Resistance To Wear ◽  
Specialty Steel ◽  
Highly Loaded

Abstract AL TECH HTB-2 is a chromium-molybdenum-vanadium steel that is a lower molybdenum high-speed steels. It has a high hardenability and is a vacuum-melted steel for bearings. It is especially suited for highly loaded bearings in gas turbine enginens operating at elevated temperatures under critical service requirements. It has outstanding resistance to wear and softening at temperatures up to 800 F and also exhibits relatively good oxidation resistance. HTB-2 is furnished in both the single vacuum-melted and double vacuum-melted condition. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and machining. Filing Code: TS-417. Producer or source: AL Tech Specialty Steel Corporation.

The Effect of Particle Size on Microwave Heated Carbon and the Subsequent Crystallite Growth

1992 ◽  
Vol 269 ◽  
Author(s):  
Claude P. Lorenson ◽  
Mark C.L. Patterson ◽  
Gail Risto ◽  
Robert Kimber
Keyword(s):  
Particle Size ◽  
Crystal Growth ◽  
Dielectric Properties ◽  
Microwave Heating ◽  
Elevated Temperatures ◽  
Microwave Energy ◽  
Heat Absorption ◽  
Crystallite Growth ◽  
Absorption Mechanism ◽  
Effect Of Particle Size

ABSTRACTThe dielectric properties of carbon imply that heating with microwave energy should not be significant at elevated temperatures. It has been demonstrated, however, that temperatures in excess of 1900°C can be achieved with low powers. The effect of particle size on the heating rate will be presented and a heat absorption mechanism is postulated to explain the high temperatures observed.Under controlled conditions, conventional and microwave heating has been used to observe growth of the carbon crystallite size up to a temperature of 1400°C. Under these conditions, no enhanced crystal growth was observed for microwave heating.

scholarly journals STUDY OF THE OXIDATIVE STABILITY OF SEVERAL TYPES OF VEGETABLE OILS WITH DIFFERENT TECHNOLOGICAL PARAMETERS

2020 ◽  
pp. 82-90
Author(s):  
N. V. Makarova ◽  
M. S. Voronina
Keyword(s):  
Fatty Acids ◽  
Microwave Heating ◽  
Vegetable Oils ◽  
Sunflower Oil ◽  
Processing Time ◽  
Elevated Temperatures ◽  
Unsaturated Fatty Acids ◽  
Storage Temperature ◽  
Treatment Time ◽  
Oxidative Processes

Vegetable oils are currently not only one of the most popular foods in the world, having a reputation for being healthy, but also the main source of unsaturated fatty acids, which prevent numerous cardiovascular and other diseases. In order to study the depth of oxidative changes in the chemical composition of the fatty acid phase in real technological processing processes and the preparation of culinary dishes using vegetable oils, the peroxide, acid, anisidine, Totox, thiobarbituric numbers for vegetable oil were studied under various conditions of model conditions: cooking (temperature 95-100 °C, processing time 30 min), frying (temperature 195-200 °C, processing time 15 min), short-term heating (microwave heating power 90 W, processing time 2 min), breaking the condition ovy storage (temperature 35-40 °C, and treatment time 3 to 7 days). With a comparative description of oxidative processes in coconut, palm, and sunflower oil, it was established that sunflower oil is prone to deep oxidative damage processes. A high propensity to increase the studied parameters was found for all treatment options, which indicates a deep occurrence of oxidative processes in vegetable oils. A particularly large effect, accelerating the oxidation of unsaturated fatty acids of sunflower oil, is observed in the case of storage at elevated temperatures and microwave heating. Based on these data, recommendations are made on the need to use natural antioxidants in the processing of vegetable oils, food production using vegetable oils, cooking culinary dishes, in the formulation of which vegetable oils are present.

CARPENTER V.S.M.

Alloy Digest ◽  
1966 ◽  
Vol 15 (5) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
Chromium Steel ◽  
Good Resistance ◽  
Temperature Performance ◽  
Resistance To Wear ◽  
Heat Checking ◽  
Resistance To Heat ◽  
Hot Hardness

Abstract Carpenter V.S.M. is a molybdenum, chromium steel which offers good resistance to heat checking, provides high hot hardness and good resistance to wear and abrasion at elevated temperatures. It is recommended for valve and bearing components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on high temperature performance as well as forming, heat treating, machining, and joining. Filing Code: TS-179. Producer or source: Carpenter.

Characterization of Rare-Earth Fluoride Anti-Stokes Phosphors by Scanning arid Transmission Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 142-143
Author(s):  
N. M. P. Low ◽  
L. E. Brosselard
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Elevated Temperatures ◽  
Stoichiometric Composition ◽  
Rare Earth Ions ◽  
Crystalline Solid ◽  
Precipitation Process ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Rare Earth Fluorides

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.

Observations oh Nucleation and Growth of Voids in Nickel

1970 ◽  
Vol 28 ◽  
pp. 414-415
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
B. Mastel
Keyword(s):  
High Purity ◽  
Growth Stage ◽  
Elevated Temperatures ◽  
Early Growth ◽  
Nucleation And Growth ◽  
Pure Nickel ◽  
Different Temperatures ◽  
Total Fluence ◽  
Neutron Exposure ◽  
Growth Of Voids

Some information on the size and density of voids that develop in several high purity metals and alloys during irradiation with neutrons at elevated temperatures has been reported as a function of irradiation parameters. An area of particular interest is the nucleation and early growth stage of voids. It is the purpose of this paper to describe the microstructure in high purity nickel after irradiation to a very low but constant neutron exposure at three different temperatures.Annealed specimens of 99-997% pure nickel in the form of foils 75μ thick were irradiated in a capsule to a total fluence of 2.2 × 1019 n/cm2 (E > 1.0 MeV). The capsule consisted of three temperature zones maintained by heaters and monitored by thermocouples at 350, 400, and 450°C, respectively. The temperature was automatically dropped to 60°C while the reactor was down.

Voids in Irradiated Tungsten and Molybdenum

1969 ◽  
Vol 27 ◽  
pp. 190-191
Author(s):  
Robert C. Rau ◽  
Robert L. Ladd
Keyword(s):  
Melting Point ◽  
Fast Neutron ◽  
Neutron Irradiation ◽  
Elevated Temperatures ◽  
Irradiation Temperature ◽  
The Body ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Recent studies have shown the presence of voids in several face-centered cubic metals after neutron irradiation at elevated temperatures. These voids were found when the irradiation temperature was above 0.3 Tm where Tm is the absolute melting point, and were ascribed to the agglomeration of lattice vacancies resulting from fast neutron generated displacement cascades. The present paper reports the existence of similar voids in the body-centered cubic metals tungsten and molybdenum.

Mechanical Properties and Dislocation Structure of Single Crystal Cdte Deformed in Compression at 300°C

1976 ◽  
Vol 34 ◽  
pp. 592-593
Author(s):  
Ernest L. Hall ◽  
J. B. Vander Sande
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Dislocation Structure ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Strain Curve ◽  
Optical Devices ◽  
Semiconductor Compound ◽  
Wide Range ◽  
Sample Orientation

The present paper describes research on the mechanical properties and related dislocation structure of CdTe, a II-VI semiconductor compound with a wide range of uses in electrical and optical devices. At room temperature CdTe exhibits little plasticity and at the same time relatively low strength and hardness. The mechanical behavior of CdTe was examined at elevated temperatures with the goal of understanding plastic flow in this material and eventually improving the room temperature properties. Several samples of single crystal CdTe of identical size and crystallographic orientation were deformed in compression at 300°C to various levels of total strain. A resolved shear stress vs. compressive glide strain curve (Figure la) was derived from the results of the tests and the knowledge of the sample orientation.

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