Processing of in situ Al3Ti/Al composites by advanced high shear technology: influence of mixing speed

Zeng, Yan; Himmler, David; Randelzhofer, P.; Körner, Carolin

doi:10.1007/s00170-020-05956-w

Cited by 6 publications

(4 citation statements)

References 31 publications

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“…Typical CMs structures are shown in Figure 2. The samples obtained by adding a reactive component to the matrix melt are characterized by the presence of Al3Ti intermetallics formed in the in-situ reaction between the matrix material and titanium [12,13] Intermetallic compounds in CMs samples poured after a 20-minute exposure of the melt are predominantly in the form of block crystals, which indicates the completion of the exothermic reaction of their formation and thermodynamic stability [14]. Due to the epitaxial correspondence, the titanium aluminide particles become crystallization centers and are fairly uniformly distributed in the aluminum matrix.…”

Section: Resultsmentioning

confidence: 99%

Aluminium matrix hybrid composite materials reinforced with carbides and intermetallics

Mikheev

Kalashnikov²

2023

E3S Web of Conf.

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Composite materials based on aluminum, reinforced withparticles of titanium carbide and intermetallic compounds of titanium aluminide, are made by casting technology. Investigations of the structure, mechanical and tribotechnical characteristics of the manufactured composite materials have been carried out. It is shown that the reinforcement of an aluminum matrix with TiC particles, or intermetallic phases of Al3Ti, formed by introducing reactive titanium powders into the melt, is an effective way to increase the tribotechnical characteristics. It has been established that the reinforcement of the aluminum matrix with TiC particles has a greater effect on the reduction of the friction coefficient and the wear rate, in comparison with the reinforcement with intermetallic phases Al3Ti, despite the higher volume fraction of the latter. It has been determined that the greatest wear resistance is provided by hybrid reinforcing of an aluminum matrix with TiC particles and intermetallic phases. The additional introduction of stronger TiC particles leads to a decrease in the load on the Al3Ti intermetallics, thereby preventing their destruction under the action of high external loads. In addition, the presence of a larger number of reinforcing phases in hybrid composite materials than in other composite materials samples provides not only a decrease in the load on each reinforcing particle separately, but also a decrease in the fraction of the matrix in the friction surface, thereby expanding the range of triboloading.

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Section: Resultsmentioning

confidence: 99%

Aluminium matrix hybrid composite materials reinforced with carbides and intermetallics

Mikheev

Kalashnikov²

2023

E3S Web of Conf.

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“…critically affect the structural properties of molecular sieve, synthesis yield and MTO reactive activation. [20][21][22][23][24][25] Dumitriu et al [26] successfully synthesized SAPO-34 molecular sieves by hydrothermal method using piperidine as a template. The optimal synthesis conditions are 1.0 Al 2 O 3 /0.6 P 2 O 5 /0.8 SiO 2 /1.1 Pip: 100 H 2 O (molar ratio), 200 °C crystallization for 4-8 days.…”

Section: Progress In the Synthesis Of Conventional Sapo-34 Molecular ...mentioning

confidence: 99%

“…According to the researchers′ continuous exploration of the hydrothermal synthesis of SAPO‐34 molecular sieves, the type and amount of its raw materials (silicon source, aluminum source, phosphorus source, template agent), hydrothermal synthesis process conditions (such as stirring time, stirring speed, feeding order, crystallization temperature, crystallization time, ageing temperature and time, crystallization temperature‐programmed rise rate, gel PH, drying temperature and time, calcination temperature and time, etc.) critically affect the structural properties of molecular sieve, synthesis yield and MTO reactive activation [20–25] …”

Section: Synthesis and Influencing Factors Of Conventional Sapo‐34 Mo...mentioning

confidence: 99%

Synthesis and Applications of SAPO‐34 Molecular Sieves

Cheng

et al. 2021

Chemistry A European J

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Silicoaluminophosphate zeolite (SAPO‐34) has been attracting increasing attention due to its excellent form selection and controllability in the chemical industry, as well as being one of the best industrial catalysts for methanol‐to‐olefin (MTO) reaction conversion. However, as a microporous molecular sieve, SAPO‐34 easily generates carbon deposition and rapidly becomes inactivated. Therefore, it is necessary to reduce the crystal size of the zeolite or to introduce secondary macropores into the zeolite crystal to form a hierarchical structure in order to improve the catalytic effect. In this review, the synthesis methods of conventional SAPO‐34 molecular sieves, hierarchical SAPO‐34 molecular sieves and nanosized SAPO‐34 molecular sieves are introduced, and the properties of the synthesized SAPO‐34 molecular sieves are described, including the phase, morphology, pore structure, acid source, and catalytic performance, in particular with respect to the synthesis of hierarchical SAPO‐34 molecular sieves. We hope that the review can provide guidance to the preparation of the SAPO‐34 catalysts, and stimulate the future development of high‐performance hierarchical SAPO‐34 catalysts to meet the growing demands of the material and chemical industries.

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“…AMCs reinforced with particulate reinforcements, such as ceramic particles and intermetallic particles, have been broadly studied owing to their extraordinary mechanical and tribological properties [13][14][15][16]. Among the particulate reinforcements, Al 3 Ti has attracted much attention as a promising reinforcement in AMCs as a result of its high Young's modulus and high hardness, as well as its low density [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

In Situ Formation of Al3Ti and Its Effects on the Microstructure, Hardness and Tribological Properties of Al Matrix Composites with Various Ti Contents

Lin

Ren

et al. 2023

Crystals

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At present, Al matrix composites (AMCs) have drawn much attention owing to their light weight, high specific strength, high thermal conductivity, and superior excellent wear resistance, which endows them with great potential in the aerospace, automobile and military industries. In this study, AMCs with different Ti contents (0, 5 and 10 vol.%) were prepared by powder metallurgy. During the sintering, Al3Ti particles were in situ formed in the Al matrix. It was found that the Ti completely reacted with the Al matrix and formed fine in situ Al3Ti particles in Al-10Ti, while some large Ti-Al3Ti core-shell formed in Al-5Ti due to the incomplete reaction between the Ti and the Al matrix. Furthermore, the hardness of the composites was significantly improved by the in situ formed Al3Ti particles, reaching 143.3 HV in Al-5Ti and the highest value at 331.2 HV in Al-10Ti, respectively. The wear resistance of the composites is remarkably enhanced by Al3Ti particles compared to the unreinforced Al. Al-5Ti has the highest wear resistance among the samples. The wear resistance of the Al-10Ti composite becomes slightly deteriorated compared to Al-5Ti due to the brittle nature of Al3Ti, which leads to a three-body abrasive wear.

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Processing of in situ Al3Ti/Al composites by advanced high shear technology: influence of mixing speed

Cited by 6 publications

References 31 publications

Aluminium matrix hybrid composite materials reinforced with carbides and intermetallics

Aluminium matrix hybrid composite materials reinforced with carbides and intermetallics

Synthesis and Applications of SAPO‐34 Molecular Sieves

In Situ Formation of Al3Ti and Its Effects on the Microstructure, Hardness and Tribological Properties of Al Matrix Composites with Various Ti Contents

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