scholarly journals High-Temperature Properties of SiC-Si3N4 Particle Composites

1998 ◽  
Author(s):  
Gerhard Woetting ◽  
Bernhard Caspers ◽  
Ernst Gugel ◽  
Ralf Westerheide
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Hot Pressing ◽  
Oxidation Behavior ◽  
Short Term ◽  
High Temperature Properties ◽  
Sintering Additive ◽  
Hot Pressing Sintering

Due to promising results in literature, SiC-Si3N4 particle composites in the range 0–100% SiC were evaluated. Focusing on high-temperature properties, mainly Y2O3 was used as sintering additive. Consolidation occurred primarily by hot-pressing, sintering tests were performed for comparison. Besides short-term properties like strength, toughness etc., long-term properties like creep and oxidation behavior were determined. Results as a function of SiC-content and microstructure were discussed with respect to materials’ performance at high temperatures and possibilities of their production on a technical scale.

High-Temperature Properties of SiC-Si3N4 Particle Composites

1999 ◽  
Vol 122 (1) ◽  
pp. 8-12 ◽  
Author(s):  
G. Woetting ◽  
B. Caspers ◽  
E. Gugel ◽  
R. Westerheide
Keyword(s):  
High Temperature ◽  
High Temperatures ◽  
Hot Pressing ◽  
Oxidation Behavior ◽  
Short Term ◽  
High Temperature Properties ◽  
Sintering Additive ◽  
Hot Pressing Sintering

Due to promising results in literature, SiC-Si3N4 particle composites in the range 0–100 percent SiC were evaluated. Focusing on high-temperature properties, mainly Y2O3 was used as sintering additive. Consolidation occurred primarily by hot-pressing, sintering tests were performed for comparison. Besides short-term properties like strength, toughness etc., long-term properties like creep and oxidation behavior were determined. Results as a function of SiC-content and microstructure were discussed with respect to materials’ performance at high temperatures and possibilities of their production on a technical scale. [S0742-4795(00)00201-5]

Long-Term Oxidation Behavior of Selected High Temperature Alloys

2007 ◽  
Author(s):  
S. Krishna Srivastava ◽  
Michael J. Newburn ◽  
John P. Cotner ◽  
Mark A. Richeson
Keyword(s):  
High Temperature ◽  
Oxidation Behavior ◽  
Scanning Electron Micrographs ◽  
Corrosion Attack ◽  
Short Term ◽  
Haynes 230 ◽  
High Temperature Alloys ◽  
Oxidation Testing ◽  
Scanning Electron

Long-term oxidation behavior of alloys cannot be estimated reliably by extrapolation of short-term results; therefore long-term testing is imperative. Such data often are not available. Oxidation testing for a period of 360 days has been conducted for several high temperature alloys extensively used in the gas turbine industry. The alloys tested comprised of HASTELLOY® X alloy, HAYNES® 230®, HR-120®, and 214™ alloys, the first three being chromia forming and the last one being an alumina forming alloy. The specimens were exposed to flowing air at 1800°F(982°C), 2000°F(1093°C), 2100°F(1149°C) and 2200°F(1204°C). The tests were interrupted and the specimens were weighed every 30 days. At the completion of each test, the samples were examined metallographically to determine the internal attack. The magnitude of oxidation attack was studied in terms of the weight change and total metal affected. The paper will report the results of the long-term oxidation testing and the analysis of the corrosion attack with the optical and scanning electron micrographs. HASTELLOY, HAYNES, 230 and HR-120 are registered trademarks and 214 is a trademark of Haynes International, Inc.

Preparation and properties of sintering additive-free AlN–BN composite ceramics by hot-pressing sintering

2015 ◽  
Vol 27 (2) ◽  
pp. 2014-2021 ◽  
Author(s):  
Cancan Jin ◽  
Taibao Wang ◽  
Limei Pan ◽  
Jian Yang ◽  
Chunfeng Hu ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Composite Ceramics ◽  
Sintering Additive ◽  
Hot Pressing Sintering

High Temperature Oxidation Behavior of Ti3SiC2 in Air

2005 ◽  
Vol 486-487 ◽  
pp. 97-100
Author(s):  
J.H. Ko ◽  
Sung Sic Hwang ◽  
Sang Whan Park ◽  
Dong Bok Lee
Keyword(s):  
High Temperature ◽  
Hot Pressing ◽  
High Temperature Oxidation ◽  
Oxidation Behavior ◽  
Coarse Grained ◽  
Amorphous Sio2 ◽  
Temperature Oxidation ◽  
Fine Grained ◽  
High Temperature Oxidation Behavior ◽  
Tio2 Rutile

Fine-grained and coarse-grained Ti3SiC2 materials were synthesized by hot pressing using TiC0.67 and Si powders as starting materials. The oxidation between 900 and 1100oC in air resulted in the formation of an outer TiO2 (rutile) layer and an inner mixed layer of TiO2 and amorphous SiO2, accompanying the liberation of carbon into the air. Fine-grained Ti3SiC2 displayed better oxidation resistance than coarse-grained one, with activation energies of 376.5~380 kJ/mol for oxidation.

scholarly journals Oxidation behavior of 316L austenitic stainless steel in high temperature air with long-term exposure

2020 ◽  
Vol 7 (6) ◽  
pp. 066517
Author(s):  
Xi Huang ◽  
Kai Xiao ◽  
Xiaodong Fang ◽  
Zicheng Xiong ◽  
Lihua Wei ◽  
...  
Keyword(s):  
Stainless Steel ◽  
High Temperature ◽  
Austenitic Stainless Steel ◽  
Oxidation Behavior ◽  
316L Austenitic Stainless Steel

TRANSPORT PROPERTIES OF PURE METALS AT HIGH TEMPERATURES: I. COPPER

1967 ◽  
Vol 45 (11) ◽  
pp. 3677-3696 ◽  
Author(s):  
M. J. Laubitz
Keyword(s):  
High Temperature ◽  
Transport Properties ◽  
High Temperatures ◽  
Pure Copper ◽  
High Temperature Properties ◽  
Temperature Range ◽  
Pure Metals

This paper is the first of a series reporting our investigations into the high-temperature properties of the monovalent metals. It contains a description of the methods used in these investigations, and the results of measurements of the transport properties of pure copper, over the temperature range 300–1 250 °K. These results are compared with some previously published work, and also with standard theoretical expressions applicable to the monovalent metals.

scholarly journals High-temperature short-term and long hardness of sintered compact and porous titanium-siliceous carbide ti3sic2

2004 ◽  
Vol 36 (1) ◽  
pp. 11-20 ◽  
Author(s):  
S.A. Firstov ◽  
E.P. Pechkovsky
Keyword(s):  
High Temperature ◽  
Ternary Compound ◽  
Solid Phase ◽  
Porous Titanium ◽  
Critical Values ◽  
Holding Time ◽  
Short Term ◽  
Sintered Compact ◽  
Temperature Range

The ternary compound of titanium-siliceous carbide Ti3SiC2, one of the representatives of Nan laminates, prepared by solid-phase sintering is investigated in compact and porous (q=0.03-0.41) states. Features of its short-term and long-term hardness (?=10 N) behavior in the temperature range from 20 to 1200?? at a holding time of 1-60 min were studied. It is shown that a temperature of about 700?? and holding time under load of about 10 min are critical values of the indentation procedure that correspond to an intensive decrease of hardness. The presence of porosity results in a decrease in hardness. a deformation scheme of compact and porous titanium-siliceous carbide Ti3SiC2 in the temperature range from 20 to 1200?? is proposed. .

Property and Microstructure of Machinable B4C/BN Nanocomposites

2008 ◽  
Vol 368-372 ◽  
pp. 936-939 ◽  
Author(s):  
Tao Jiang ◽  
Zhi Hao Jin ◽  
Jian Feng Yang ◽  
Guan Jun Qiao
Keyword(s):  
Fracture Toughness ◽  
High Temperature ◽  
Chemical Reaction ◽  
Fracture Strength ◽  
Vickers Hardness ◽  
Hot Pressing ◽  
Composite Powders ◽  
B4c Particles ◽  
Hot Pressing Sintering ◽  
Nanocomposite Powders

The B4C/BN nanocomposites were fabricated by hot-pressing sintering of the B4C/BN nanocomposite powders at 1850oC for 1h under the pressure of 30MPa. The composite powders with the microstructure of B4C particles coated with nano-sized BN particles were prepared by the chemical reaction of H3BO3 and CO(NH2)2 on the surface of B4C particles at high temperature. The microstructure investigation of the nanocomposites sintered samples showed that the nano-sized h-BN particles were homogenously distributed in the B4C matrix. With the increasing content of h-BN, the density of the B4C/BN nanocomposites decreased gradually; the fracture strength and fracture toughness of the B4C/BN nanocomposites decreased gradually, the strength and toughness of the B4C/BN nanocomposites with the h-BN content of 10wt% and 20wt% achieved high values. The Vickers hardness of the B4C/BN nanocomposites decreased remarkably with the increasing content of h-BN, while the machinability of the B4C/BN nanocomposites was significantly improved. The B4C/BN nanocomposites with the h-BN content more than 20wt% exhibited excellent machinability.

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