High Temperature Microstructural Stability of Si3N4 in TiAl Alloys

2007 ◽  
Vol 534-536 ◽  
pp. 1577-1580
Author(s):  
Jee Hoon Choi ◽  
Dong Bok Lee
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Reaction Layer ◽  
Microstructural Stability ◽  
Tial Alloys ◽  
Plasma Sintering ◽  
The Matrix ◽  
Spark Plasma

Alloys of Ti-50 at.% Al with (3 and 10)wt.% Si3N4 particles were prepared by a mechanical alloying-spark plasma sintering (MA-SPS) method. The matrix consisted primarily of TiAl, Ti2AlN, TiN. Si3N4 was unstable in the matrix and started to decompose forming a Ti5Si3 reaction layer on the surface of former Si3N4 particles during sintering and heat treatment at 1373 K.

scholarly journals NIOBIUM REINFORCED BY α-Al2O3 FIBERS Part 1. Two-Component Compositions

2021 ◽  
pp. 58-77
Author(s):  
E.N. Kablov ◽  
◽  
B.V. Shchetanov ◽  
A.N. Bolshakova ◽  
I.Yu. Efimochkin ◽  
...  
Keyword(s):  
High Temperature ◽  
Mechanical Alloying ◽  
Barrier Coatings ◽  
Ternary Diagrams ◽  
New Class ◽  
Plasma Sintering ◽  
Two Component ◽  
The Matrix ◽  
Spark Plasma ◽  
Α Al2o3

The paper reviews the results of development of a new class of high-temperature composites based on niobium and various types of reinforcers continuous monocrystalline fibers (MCF) α-Al2O3, with TiN, Mo, W barrier coatings, and with controlled (Si, Ti) and uncontrolled (O, C) impurities. The analysis of Nb–Si, Nb–C, Nb–O binary diagrams and Nb–Si–Ti, Nb–Fe–Ti ternary diagrams was performed, on the basis of which the matrix compositions were selected. The basis for the preparation of composites was the powder method of mechanical alloying of the mixture preparing, followed by its pressing together with α-Al2O3 MCF by spark plasma sintering (SPS) and further preparation of experimental samples. An analysis of the interaction of fibers with a matrix was carried out, where the matrix was Nb or system on the basis of the above mentioned binary or ternary diagrams.

Synthesis and Spark Plasma Sintering of Mg2Si Nanopowder by Mechanical Alloying and Heat Treatment

2016 ◽  
Vol 13 (3) ◽  
pp. 498-505 ◽  
Author(s):  
Mohammad Khajelakzay ◽  
Saeed Reza Bakhshi ◽  
Gholam Hossein Borhani ◽  
Mazaher Ramazani
Keyword(s):  
Heat Treatment ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Plasma Sintering ◽  
Spark Plasma

High Temperature Oxidation-Sulfidation of Cr-ZrO2-Al2O3 Composite Fabricated by Mechanical Alloying and Spark Plasma Sintering

2005 ◽  
Vol 24-25 ◽  
pp. 391-394
Author(s):  
A. Martínez-Villafañe ◽  
U. Arce-Colunga ◽  
Victor M. Orozco-Carmona ◽  
C. Gaona-Tiburcio ◽  
R.A. Saucedo-Acuña ◽  
...  
Keyword(s):  
High Temperature ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
Plasma Sintering ◽  
Spark Plasma

Spark Plasma Sintering Behavior of Fe-TiC Composite Materials Fabricated by Mechanical Alloying

2007 ◽  
Vol 544-545 ◽  
pp. 825-828 ◽  
Author(s):  
Ho Jung Cho ◽  
Sung Yeal Bae ◽  
In Shup Ahn ◽  
Dong Kyu Park
Keyword(s):  
High Temperature ◽  
Composite Materials ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Cutting Tools ◽  
High Hardness ◽  
Sintering Behavior ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Sintering Properties

TiC-based cermets attract much attention because of their excellent wear-resistance, high hardness at high temperature, good chemical stability, superior thermal deformation resistance. Therefore, titanium carbide is mainly used for cutting tools, grinding wheels, coated cutting tips and coated steel tools. In this research, Fe-TiC composite materials were fabricated by spark plasma sintering (SPS) after mechanical alloying. TiH2 and graphite powders were used to synthesize TiC phase. In order to compare the properties of sintered materials using mixture powder (D’AE+TiH2+graphite), commercial TiC powder was mixed with Distaloy AE (D’AE) powder as a same mechanical alloying method. Then, the shape of each mixture powder (D’AE+TiH2+graphite, D’AE+TiC (commercial)) and sintering properties were compared. TiC phase was synthesized by self-propagating high-temperature synthesis (SHS) reaction during spark plasma sintering. It was confirmed by using X-ray diffraction (XRD). Energy dispersive spectrometry (EDS) and Scanning electron microscopy (SEM) were used to observe shape of mixture powders and also sintering properties were examined such as hardness, relative density. In case of sintered material for 10min holding time at 1373K after mechanical alloying for 1 hour with D’AE, TiH2 and graphite, it indicated higher hardness value 49HR-C than a case using D’AE and TiC powder.

High Temperature Oxidation of Cr-ZrO2-Al2O3 Composite Fabricated by Mechanical Alloying and Spark Plasma Sintering

2006 ◽  
pp. 129-134
Author(s):  
U. Arce-Colunga ◽  
F.A. Reyes-Valdes ◽  
A. Martínez-Villafañe ◽  
Victor M. Orozco-Carmona ◽  
F. Almeraya-Calderón ◽  
...  
Keyword(s):  
High Temperature ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Microstructure and Mechanical Properties of Ti-Nb Alloys Prepared by Mechanical Alloying and Spark Plasma Sintering

2019 ◽  
Vol 29 (3) ◽  
pp. 1445-1452 ◽  
Author(s):  
Damian Kalita ◽  
Łukasz Rogal ◽  
Tomasz Czeppe ◽  
Anna Wójcik ◽  
Aleksandra Kolano-Burian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
Recoverable Strain ◽  
Α Phase ◽  
Plasma Sintering ◽  
Nb Content ◽  
Spark Plasma ◽  
Sintered Alloys

Abstract The effect of Nb content on microstructure, mechanical properties and superelasticity was studied in Ti-Nb alloys fabricated by powder metallurgy route using mechanical alloying and spark plasma sintering. In the microstructure of the as-sintered materials, undissolved Nb particles as well as precipitations of α-phase at grain boundaries of β-grains were observed. In order to improve the homogeneity of the materials, additional heat treatment at 1250 °C for 24 h was performed. As a result, Nb particles were dissolved in the matrix and the amount of α-phase was reduced to 0.5 vol.%. Yield strength of the as-sintered alloys decreased with Nb content from 949 MPa for Ti-14Nb to 656 MPa for Ti-26Nb, as a result of the decreasing amount of α-phase precipitations. Heat treatment did not have a significant effect on mechanical properties of the alloys. A maximum recoverable strain of 3% was obtained for heat-treated Ti-14Nb, for which As and Af temperatures were − 12.4 and 2.2 °C, respectively.

scholarly journals High Temperature Oxidation Resistance Performance of TiC/Mo Composite by Spark Plasma Sintering

2021 ◽  
Author(s):  
Renheng HAN ◽  
Ziming BAO ◽  
Yanqin ZHU ◽  
Ning LI ◽  
Ming TANG ◽  
...  
Keyword(s):  
High Temperature ◽  
Oxide Film ◽  
Oxidation Resistance ◽  
Spark Plasma Sintering ◽  
High Temperature Oxidation ◽  
Oxidation Process ◽  
Temperature Oxidation ◽  
Plasma Sintering ◽  
The Matrix ◽  
Spark Plasma

In this paper, the Titanium carbide/Molybdenum (TiC/Mo) alloy was prepared by spark plasma sintering (SPS). The oxidation process of the TiC/Mo alloy at different oxidation temperatures was studied, and the oxidation mechanism was discussed in depth. The focus is on the influence of the introduction of TiC particles on the high-temperature oxidation properties of Mo alloys. The phase composition and morphology of the oxide film were analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results showed that, after oxidation, the surface oxide film is mainly composed of Titanium dioxide (TiO2), Molybdenum dioxide (MoO2), Molybdenum trioxide (MoO3) and Molybdenum oxide hydrate (MoO3(H2O)2) phases. As the oxidation temperature increases, the surface of the oxide film will warp, and thereby increase porosity. The dense MoO2 will form a protective inner oxide layer and inhibit further progress of the TiC/Mo alloy. Oxygen will undergo violent oxidation through the pores and the inside of the matrix, and the protective MoO2 internal oxide film will disappear. TiC particles dispersed in the matrix will be oxidized to form TiO2, which will be gradually deposited on the surface of the oxide film, hindering the diffusion of oxygen to the matrix. The quantity loss during the entire oxidation process is significantly reduced. Therefore, the introduction of TiC can greatly improve the oxidation resistance of Mo alloys.

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