Characterization of SiO2-encapsulated WSi2/W5Si3 nanoparticles synthesized by a mechanochemical route

Ovalı, Didem; Ağaoğulları, Duygu; Öveçoğlu, M. Lütfi

doi:10.1016/j.ceramint.2018.02.161

Cited by 14 publications

(1 citation statement)

References 53 publications

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“…According to Figures 1a and 1b, the results of the thermal analysis and its XRD for ASW system respectively formed the tungsten silicide (W 5 Si 3 and WSi 2 ) along with the alumina phase 25,26 . The DTA diagram ( Figure 1a) shows a generally positive slope indicating that the reaction of aluminothermic and the formation of tungsten silicide (Reaction 1 to 4 in Table 4) become more and more exothermic by the increase of the temperature.…”

Section: Asw Systemmentioning

confidence: 99%

Thermal Analysis on the Milled Al+B2O3+Si+WO3 System to Synthesize Al2O3-WxSiy-WxBy Powders

Moghaddam

Kalantar

2020

Mat. Res.

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Composites including silicide of tungsten and boride of tungsten intermetallic compound as reinforced agents in alumina matrix have a good mechanical properties in low and high temperature (high friction resistance, strength, resin stance to creep and relatively high thermal shock resistance), moreover, they have chemical neutral with a high corrosion resistance in a high corrosive and high temperature environment. The purpose of this study is to investigate thermal analysis, phase and microstructural evaluation during synthesis of above mentioned composite by combustion aluminothermic processing in three systems 1-Al+Si+WO 3 , 2-Al+B 2 O 3 +WO 3 and 3-Al+B 2 O 3 +Si+WO 3. A Ball-milled starting material according to stoichiometric ratio was thermal analyzed (DTA-TGA) for each of above mentioned system. The XRD results never show any new phase during ball-milling even up to 10 hours. The forming of tungsten silicide (W x Si y) is in lower temperature in comparison with tungsten boride (W x B y) during the thermal analysis experiments. The presence of Si in the Al+B 2 O 3 +WO 3 system facilitates the formation of tungsten borides. The microstructural observations show a uniform and dense distribution of silicide and boride of tungsten in the alumina matrix. Silicide phases are small grain with spherical morphology whereas; the boride phases are coarser and relatively elongated with irregular morphology.

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Section: Asw Systemmentioning

confidence: 99%

Thermal Analysis on the Milled Al+B2O3+Si+WO3 System to Synthesize Al2O3-WxSiy-WxBy Powders

Moghaddam

Kalantar

2020

Mat. Res.

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Powder Metallurgical Processing of Al–5 wt% Cu Matrix Composites Reinforced with MoSi₂ and WSi₂ Particulates

Mertdinç‐Ülküseven,

Ovalı‐Döndaş,

Süzer

et al. 2024

Adv Eng Mater

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Herein, investigations on the microstructural, physical, and mechanical properties of molybdenum disilicide (MoSi2)‐ and tungsten disilicide (WSi2)‐reinforced aluminum (Al)–copper (Cu) matrix composites are reported. Powder metallurgy methods such as mechanochemical synthesis (MCS), mechanical alloying (MA), cold pressing, and pressureless sintering are combined to produce composites. First of all, MoSi2 and WSi2 nanoparticles are synthesized by MCS and selective acid leaching, yielding reinforcement materials for Al–Cu matrix. Powder blends consisting of 95 wt% Al and 5 wt% Cu are mixed with metal disilicides at different weight percentages (1, 2, and 5 wt%). MA for 4 h is conducted on these overall blends using a high‐energy ball mill. Microstructural and thermal properties of the as‐blended and mechanically alloyed powders are determined, and then they are compacted under 450 MPa and sintered at 550 °C for 2 h. Mechanical characterization of the composites reveals an increase in hardness and wear resistance with an increasing amount of reinforcement content. Among bulk samples, 5 wt% WSi2‐reinforced composites have the highest microhardness (165 ± 15 HV) and lowest wear rate (1.69 × 106 μm3 Nm−1) values. However, under the compression forces, the highest toughness and strength are obtained from 2 wt%‐reinforced composites.

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Characterization of mechanically alloyed and pressureless sintered Al-7 wt% Si-2 wt% LaB6-2 wt% (MoSi2, WSi2) hybrid composites

Tekoğlu

Yürektürk

Ağaoğulları

et al. 2019

Advanced Powder Technology

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Characterization of SiO2-encapsulated WSi2/W5Si3 nanoparticles synthesized by a mechanochemical route

Cited by 14 publications

References 53 publications

Thermal Analysis on the Milled Al+B2O3+Si+WO3 System to Synthesize Al2O3-WxSiy-WxBy Powders

Thermal Analysis on the Milled Al+B2O3+Si+WO3 System to Synthesize Al2O3-WxSiy-WxBy Powders

Powder Metallurgical Processing of Al–5 wt% Cu Matrix Composites Reinforced with MoSi₂ and WSi₂ Particulates

Characterization of mechanically alloyed and pressureless sintered Al-7 wt% Si-2 wt% LaB6-2 wt% (MoSi2, WSi2) hybrid composites

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Characterization of SiO2-encapsulated WSi2/W5Si3 nanoparticles synthesized by a mechanochemical route

Cited by 14 publications

References 53 publications

Thermal Analysis on the Milled Al+B2O3+Si+WO3 System to Synthesize Al2O3-WxSiy-WxBy Powders

Thermal Analysis on the Milled Al+B2O3+Si+WO3 System to Synthesize Al2O3-WxSiy-WxBy Powders

Powder Metallurgical Processing of Al–5 wt% Cu Matrix Composites Reinforced with MoSi2 and WSi2 Particulates

Characterization of mechanically alloyed and pressureless sintered Al-7 wt% Si-2 wt% LaB6-2 wt% (MoSi2, WSi2) hybrid composites

Contact Info

Product

Resources

About

Powder Metallurgical Processing of Al–5 wt% Cu Matrix Composites Reinforced with MoSi₂ and WSi₂ Particulates

Characterization of mechanically alloyed and pressureless sintered Al-7 wt% Si-2 wt% LaB6-2 wt% (MoSi2, WSi2) hybrid composites