Pressure-assisted SHS synthesis of MgAl2O4–TiAl in situ composites with interpenetrating networks

Horvitz, Dror; Готман, И.

doi:10.1016/s1359-6454(02)00041-1

Cited by 42 publications

(24 citation statements)

References 16 publications

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“…17)-19) Horvitz and Gotman 20) produced MgAl2O4/TiAl composite by CS of a blend of TiO2, Mg and Al powders where all the blend components were reactive and the evolved heat was used only in densification of the product. However, successful management of the heat released from CS can also be used in generating side reactions which cannot proceed in a self-propagating style.…”

Section: )-5)mentioning

confidence: 99%

In-situ synthesis of porous magnesia spinel/TiB2 composite by combustion technique

Zaki

Ahmed

Abdel-Gawad

2009

J. Ceram. Soc. Japan

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In this work, the very weak exothermic formation reaction of MgAl2O4 spinel is successfully conducted in a self-sustaining manner with the advantages of energy savings, high reaction rate and highly porous product. The energy and Al2O3 required for this reaction are obtained from the combustion reaction of TiO2-B2O3-Al while MgO is added to the reactive mixture. Ignition of the reaction mixture is carried out at room temperature despite the dilution effect of MgO (19 vol%). Reduced aluminium grain size and preheating the reactant before ignition were found to be very effective to complete the formation reaction of MgAl2O4 spinel. Thermodynamic calculations of adiabatic combustion temperatures and spinel molten fractions at different initial temperatures were carried out. Oxidation resistance study of this new composite shows that it can safely work up to 600°C in open atmosphere and that 700°C is considered to be its threshold oxidation temperature.

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Section: )-5)mentioning

confidence: 99%

In-situ synthesis of porous magnesia spinel/TiB2 composite by combustion technique

Zaki

Ahmed

Abdel-Gawad

2009

J. Ceram. Soc. Japan

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“…For a powder mixture with the ratio of components Ti:B = 1:2 the adiabatic temperature of combustion is Tad = 3190 K [5]. Alumina-magnesia spinel MgAl 2 O 4 is inert in relation to the mixture Ti-2B.…”

Section: Resultsmentioning

confidence: 99%

“…According to the literature data [5], 12 mol % of MgO and 85.5 mol % of Al 2 O 3 can be dissolved in alumina-magnesia spinel. In Table 2, the eutectic melting temperatures in the MgO-Al 2 O 3 system are presented.…”

Section: Mgal2o4mentioning

confidence: 99%

Self-Propagating High Temperature Synthesis of TiB2–MgAl2O4 Composites

Radishevskaya¹,

Лепакова²,

Karakchieva

et al. 2017

Metals

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Metal borides are widely used as heat-insulating materials, however, the range of their application in high-temperature conditions with oxidative medium is significantly restricted. To improve the thermal stability of structural materials based on titanium boride, and to prevent the growth of TiB 2 crystals, additives based on alumina-magnesia spinel with chemical resistant and refractory properties have been used. The aim of this work is to study the structure of TiB 2 with alumina-magnesia spinel additives obtained by self-propagating high-temperature synthesis (SHS). TiB 2 structure with uniform fine-grained distribution was obtained in an MgAl 2 O 4 matrix. The material composition was confirmed by X-ray diffraction analysis (DRON-3M, filtered Co kα-emission), FTIR spectroscopy (Thermo Electron Nicolet 5700, within the range of 1300-400 cm −1 ), and scanning electron microscopy (Philips SEM 515). The obtained material represents a composite, where the particles of TiB 2 with a size of 5 µm are uniformly distributed in the alloy of alumina-magnesia spinel.

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“…[17] The same reactions were demonstrated upon conversion of volatile oxides into interconnected fibers of MgAl 2 O 4 (spinel) phase in an Al alloy by self-propagating, high-temperature synthesis of powder compacts. [18,19] It was reported that oxide particles work better as nucleating substrates when the melt is subjected to an external physical field. Atamanenko et al [20] reported improved nucleation of aluminum on synthetic Al 2 O 3 particles after ultrasonic cavitation melt processing.…”

Section: Introductionmentioning

confidence: 99%

Potential of an Al-Ti-MgAl2O4 Master Alloy and Ultrasonic Cavitation in the Grain Refinement of a Cast Aluminum Alloy

Sreekumar

Babu

Eskin

2016

Metall Mater Trans B

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A new grain refining master alloy containing MgAl 2 O 4 and Ti was synthesized by in situ reaction of TiO 2 particles in an Al-Mg melt. MgAl 2 O 4 particles formed were distributed in the melt by ultrasonic cavitation processing. The obtained master alloy showed considerable (50 pct) grain refining ability in a commercial A357-type Al-Si alloy. Ultrasonication contributed further to 25 pct in the grain refinement. In comparison with a commercial Al-5 pct Ti-1 pct B master alloy, the efficiency of the new master alloy is less at a lower addition rate. Nevertheless, both master alloys performed similarly at higher additions. The strength and ductility of the inoculated and ultrasonicated alloy showed at least a 10 pct and a 50 pct increase, respectively, as compared with non-grain-refined alloy and a similar mechanical performance in comparison with the alloy inoculated with Al-5 pct Ti-1 pct B master alloy.

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Pressure-assisted SHS synthesis of MgAl2O4–TiAl in situ composites with interpenetrating networks

Cited by 42 publications

References 16 publications

In-situ synthesis of porous magnesia spinel/TiB2 composite by combustion technique

In-situ synthesis of porous magnesia spinel/TiB2 composite by combustion technique

Self-Propagating High Temperature Synthesis of TiB2–MgAl2O4 Composites

Potential of an Al-Ti-MgAl2O4 Master Alloy and Ultrasonic Cavitation in the Grain Refinement of a Cast Aluminum Alloy

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