Study of Ti – Al based high-temperature cermet filters

2021 ◽  
Vol 87 (12) ◽  
pp. 23-29
Author(s):  
A. O. Kirillov ◽  
V. I. Uvarov ◽  
R. D. Kapustin
Keyword(s):  
High Temperature ◽  
Gas Flow ◽  
Elevated Temperatures ◽  
Pore Space ◽  
High Strength ◽  
Corrosive Media ◽  
Thermal Tests ◽  
Entire Volume ◽  
Intermetallic System ◽  
Effective Use

Operation in corrosive media and/or at high temperatures requires improved characteristics of the performance and durability of filtering equipment. The Ti – Al intermetallic system combines low density with high strength and exhibits high resistance to oxidation and corrosion at elevated temperatures. We present the results of studying high-temperature Ti – Al cermet products (filters) with nanoscale pores. Filters were obtained from a mixture of Ti and Al powders (mass ratio 40:60) by thermal explosion. XRD methods showed that the synthesized material consists of two main phases: TiAl3 and Al2O3. The microstructure analysis revealed the presence of large-sized TiAl3 structures and spherical Al2O3 aggregates enveloped by nanostructured TiAl3. Moreover, nanoscale fibrous TiAl3 compounds forming a multilevel developed cobweb-like structure are observed in the entire volume of the pore space of the material. The open porosity of the material was 48%, the pore size was 0.1 – 0.2 μm, the efficiency of the porous material was 99.999%, the resistance to gas flow was 100 mm of water column, and the filtration index was 0.062. Thermal tests revealed the possibility of effective use of filters under conditions of elevated (up to 800°C) temperatures and corrosive media due to the chemically stable and heat-resistant binary structure of the material. The results obtained can be used to improve the methodology of the development and operation of high-temperature cermet filters based on Ti – Al.

CARPENTER L-605 ALLOY

Alloy Digest ◽  
1987 ◽  
Vol 36 (8) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Elevated Temperatures ◽  
Base Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Temperature Performance ◽  
Cobalt Base Alloy ◽  
Cobalt Base ◽  
Oxidation And Corrosion

Abstract CARPENTER L-605 alloy is a nonmagnetic cobalt-base alloy that has good oxidation and corrosion resistance and high strength at elevated temperatures. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Co-81. Producer or source: Carpenter.

BUDERUS 58-28

Alloy Digest ◽  
1972 ◽  
Vol 21 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Elevated Temperatures ◽  
High Strength ◽  
Heat Treating ◽  
Cobalt Alloy ◽  
Temperature Performance ◽  
Steel Corporation

Abstract BUDERUS 58-28 is a cobalt alloy having high strength and excellent toughness at elevated temperatures. This datasheet provides information on composition, physical properties, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Co-64. Producer or source: Buderus Steel Corporation.

Mechanical Properties and Microstructure of the Newly Developed Steel (Low C 18Cr-11Ni-3Cu-Mo-Nb-B-N) After Aging Treatment

2020 ◽  
Author(s):  
Nao Otaki ◽  
Tomoaki Hamaguchi ◽  
Takahiro Osuki ◽  
Yuhei Suzuki ◽  
Masaki Ueyama ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Vickers Hardness ◽  
Elevated Temperatures ◽  
Rupture Strength ◽  
Aging Treatment ◽  
High Strength ◽  
High Temperature Strength ◽  
Short Term ◽  
Rich Phase

Abstract In petroleum refinery plants, materials with high sensitization resistance are required. 347AP has particularly been developed for such applications and shows good sensitization resistance owing to its low C content. However, further improvement in high temperature strength is required for high temperature operations in complex refineries, such as delayed cokers. Recently, a new austenitic stainless steel (low C 18Cr-11Ni-3Cu-Mo-Nb-B-N, UNS No. S34752) with high sensitization resistance and high strength at elevated temperatures has been developed. In this study, the mechanical properties and microstructures of several aged specimens will be reported. By conducting several aging heat treatments in the range of 550–750 °C for 300–10,000 h on the developed steel, it was revealed that there were only few coarse precipitates that assumed sigma phase even after aging at 750 °C for 10,000 h. This indicates that the newly developed steel has superior phase stability. The developed steel drastically increased its Vickers hardness by short-term aging treatments. Through transmission electron microscopy observations, the fine precipitates of Cu-rich phase were observed dispersedly in the ruptured specimen. Therefore, the increase in Vickers hardness in short-term aging is possibly owing to the dispersed precipitation of Cu-rich phase. There was further increase in Vickers hardness owing to Z phase precipitation; however, the increment was smaller than that caused by Cu-rich phase. The newly developed alloy demonstrated excellent creep rupture strength even in the long-term tests of approximately 30,000 h, which is attributed to these precipitates.

Paper 7: Advanced Nickel-Chromium Base Alloys

1965 ◽  
Vol 180 (4) ◽  
pp. 160-171
Author(s):  
C. H. White ◽  
J. Heslop
Keyword(s):  
High Temperature ◽  
Binary System ◽  
Gas Turbine ◽  
Elevated Temperatures ◽  
High Strength ◽  
Gas Turbine Engine ◽  
Turbine Engine ◽  
Nickel Chromium ◽  
Chromium Alloys ◽  
Resistance To Oxidation

Nickel-chromium alloys have been in use since early in this century for high temperature applications because of their resistance to oxidation. Since the advent of the gas-turbine engine, more complex alloys capable of maintaining high strength at elevated temperatures have been developed from the simple binary system. These complex alloys were initially mainly strengthened by the precipitation of the Ni3(Ti, Al) phase but more recent alloys have been further strengthened by additions of cobalt, tungsten, molybdenum, niobium, and tantalum. The properties and applications of these alloys are discussed.

Model Combustor to Assess the Oxidation Behavior of Ceramic Materials Under Real Engine Conditions

1999 ◽  
Author(s):  
D. Filsinger ◽  
A. Schulz ◽  
S. Wittig ◽  
C. Taut ◽  
H. Klemm ◽  
...  
Keyword(s):  
High Temperature ◽  
International Development ◽  
Gas Turbines ◽  
Gas Flow ◽  
Oxidation Behavior ◽  
Elevated Temperatures ◽  
Ceramic Materials ◽  
Test Rig ◽  
Combustion Gas ◽  
Wide Range

A further increase of thermal efficiency and a reduction of the exhaust emissions of ground based gas turbines can be achieved by introducing new high temperature resistant materials. Therfore, ceramics are under international development. They offer excellent strengths at room and elevated temperatures. For gas turbine combustor applications, however, these materials have to maintain their advantageous properties under hostile environment. For the assessment and comparison of the oxidation behavior of different nonoxide ceramic materials a test rig was developed at the Institute for Thermal Turbomachinery (ITS), University of Karlsruhe, Germany. The test rig was integrated into the high temperature/ high pressure laboratory. A ceramic model combustion chamber was designed which allowed the exposure of standard four-point flexure specimens to the hot combustion gas flow. Gas temperatures and pressures could be varied in a wide range. Additionally, the partial steam pressure could be adjusted to real combustor conditions. The present paper gives a detailed description of the test rig and presents results of 100 hours endurance tests of ceramic materials at 1400°C. The initial strengths and the strengths after oxidation tests are compared. In addition to this, photographs illustrating the changes of the material’s microstructure are presented.

scholarly journals STRAIN BEHAVIOUR OF ULTRA-HIGH-STRENGTH CONCRETE UNDER THE ELEVATED TEMPERATURE AND 0.25FCK LOADING

2016 ◽  
Author(s):  
Gyu Yong Kim ◽  
Young Wook Lee ◽  
Nenad Gucunski ◽  
Gyeong Cheol Choe ◽  
Min Ho Yoon
Keyword(s):  
Compressive Strength ◽  
High Temperature ◽  
High Strength Concrete ◽  
Loading Condition ◽  
Elevated Temperatures ◽  
High Strength ◽  
Total Strain ◽  
High Temperature Creep ◽  
Temperature Creep ◽  
Strain Behaviour

The high-temperature creep of Ultra-High-Strength Concrete (UHSC) has been investigated in this study. The purpose of this study is to evaluated total strain and high-temperature creep at elevated temperatures under loading condition of UHSC. To evaluate the strain behaviour of UHSC at elevated temperatures, ϕ100 mm × 200 mm cylindrical specimens of UHSC with compressive strengths of 80, 130 and 180 MPa concrete were heated to 700 °C at a rate of 1 °C/min. The total strain and high-temperature-creep were measured under the loading condition of 0.25 of the compressive strength at room temperature. As results, Total strain of UHSC increased showing shrinkage with increasing compressive strength. The high-temperature creep of UHSC increased with the temperature and higher level of compressive strength showed bigger high-temperature creep.

AISI No. 671

Alloy Digest ◽  
1981 ◽  
Vol 30 (10) ◽  
Keyword(s):  
High Temperature ◽  
Elevated Temperatures ◽  
Base Alloy ◽  
Turbine Blades ◽  
High Strength ◽  
Heat Treating ◽  
Age Hardening ◽  
Jet Engines ◽  
Cobalt Base Alloy ◽  
Cobalt Base

Abstract AISI No. 685 is a high-temperature, high-strength, cobalt-base alloy. It responds to an age-hardening heat treatment. At elevated temperatures it has high mechanical properties and excellent resistance to corrosion and oxidation. Its numerous applications include high-temperature hardware, turbine blades, parts for jet engines and aerospace components. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness, creep, and fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Co-79. Producer or source: High-strength, high-temperature alloy mills & foundries.

PANDEX VAC ARC

Alloy Digest ◽  
1961 ◽  
Vol 10 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Precipitation Hardening ◽  
Elevated Temperatures ◽  
High Strength ◽  
Heat Treating ◽  
Good Corrosion Resistance ◽  
Temperature Performance

Abstract PANDEX VAC ARC is a precipitation hardening, austenitic, heat resisting alloy designed for service at elevated temperatures where high strength and good corrosion resistance are required. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on low and high temperature performance, and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-115. Producer or source: Latrobe Steel.

CRUTEMP 25

Alloy Digest ◽  
1975 ◽  
Vol 24 (4) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Control Systems ◽  
Gas Turbines ◽  
Elevated Temperatures ◽  
High Strength ◽  
Heat Treating ◽  
Temperature Performance ◽  
Automotive Emission

Abstract CRUTEMP 25 is a fully austenitic stainless steel with outstanding resistance to scaling at elevated temperatures. It also has high strength at elevated temperatures and its weldability is excellent. It is used in such applications as automotive emission control systems and gas turbines. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: SS-309. Producer or source: Crucible Stainless Steel Division, Colt Industries.

ACI TYPE HF

Alloy Digest ◽  
1963 ◽  
Vol 12 (5) ◽  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
High Temperature ◽  
High Resistance ◽  
Elevated Temperatures ◽  
High Strength ◽  
Heat Treating ◽  
Temperature Performance ◽  
Resistance To Oxidation ◽  
Iron Chromium

Abstract Type HF is an austenitic iron-chromium-nickel alloy offering high resistance to oxidation at elevated temperatures, high strength and corrosion resistance. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: SS-143. Producer or source: Stainless steel foundries.

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