A novel technique for fabricatingin situ Al2O8/Ti x Al y composites

Wang, D. Z.; Liu, Z. R.; Yao, C.K.; Yao, Meibao

doi:10.1007/bf00591594

Cited by 26 publications

(25 citation statements)

References 2 publications

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“…[2]) can be written E. Bending Test by considering the free-energy changes for possible reaction products between the TiO 2 reinforcement and the aluminum The bending strength with various temperatures is shown matrix [16,17,18] and the Al-Ti phase equilibrium diagram taken in Figure 11. The composite composed of TiO 2 /A356 withfrom Reference 19. out heat treatment has an excellent bending strength (685 MPa).…”

Section: Methodsmentioning

confidence: 99%

Effect of heat treatments on In-Situ Al2O3/TiAl3 composites produced from squeeze casting of TiO2/A356 composites

Hsu

Chao

2002

Metall Mater Trans B

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In-situ Al 2 O 3 /TiAl 3 intermetallic matrix composites were fabricated via squeeze casting of TiO 2 /A356 composites heated in the temperature range from 700 ЊC to 780 ЊC for 2 hours. The phase transformation in TiO 2 /A356 composites employing various heat-treatment temperatures (700 ЊC to 780 ЊC) was studied by means of differential thermal analysis (DTA), microhardness, scanning electron microscopy (SEM), electron probe microanalysis (EPMA), and X-ray diffraction (XRD). From DTA, two exothermic peaks from 600 ЊC to 750 ЊC were found in the TiO 2 /A356 composites. The XRD showed that Al 2 O 3 and TiAl 3 were the primary products after heat treatment of the TiO 2 /A356 composite. The fabrication of in-situ Al 2 O 3 /TiAl 3 composites required 33 vol pct TiO 2 in Al and heat treatment in the range from 750 ЊC to 780 ЊC. The hardness (HV) of the in-situ Al 2 O 3 /TiAl 3 composites (1000 HV) was superior to that of nonreacted TiO 2 /A356 composites (200 HV). However, the bending strength decreased from 685 MPa for TiO 2 /A356 composites to 250 MPa for Al 2 O 3 /TiAl 3 composites. It decreased rapidly because pores occurred during the formation of Al 2 O 3 and TiAl 3 . The activation energy of the formation of Al 2 O 3 and TiAl 3 from TiO 2 and A356 was determined to be about 286 kJ/mole.

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Section: Methodsmentioning

confidence: 99%

Effect of heat treatments on In-Situ Al2O3/TiAl3 composites produced from squeeze casting of TiO2/A356 composites

Hsu

Chao

2002

Metall Mater Trans B

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“…For the TiO 2 -Al system without B, the thermite reaction takes place at 738 ЊC to 825 ЊC: [28] 3TiO…”

Section: Tio 2 -Al-b Systemmentioning

confidence: 99%

In Situ ceramic particle-reinforced aluminum matrix composites fabricated by reaction pressing in the TiO2 (Ti)-Al-B (B2O3) systems

Tjong

1997

Metall Mater Trans A

100

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Particulate TiB 2 reinforced aluminum-based metal matrix composites (MMCs) were successfully fabricated by means of the reaction processing method. TiB 2 particulates were formed in situ through the reaction of Ti and B in systems. The results showed that in situ TiB 2 particulates formed in the Ti-Al-B system had a size of 5 m and they exhibited block and rodlike structures. Moreover, coarse Al 3 Ti blocks several tens of micrometers in size were also formed simultaneously. On the other hand, equiaxed Al 2 O 3 and TiB 2 particulates with a size of less than 2 m were formed in situ in the TiO 2 -Al-B and TiO 2 -Al-B 2 O 3 systems. The Al 3 Ti phase was completely eliminated in the TiO 2 -Al-B system with increasing B content. Tensile tests revealed that the Al 2 O 3 ⅐ TiB 2 /Al composite fabricated from the TiO 2 -Al-B system exhibits excellent mechanical properties. The yield strength of the Al 2 O 3 ⅐ TiB 2 /Al composite appeared to increase with increasing TiB 2 content. The yield strength of the Al 2 O 3 ⅐ TiB 2 /Al composite could be further increased by introducing CuO into the TiO 2 -Al-B system. Such an increment in mechanical strength arose from the strengthening effect caused by the Al 2 Cu precipitates. The incorporation of CuO had no effect on the in situ reaction process of the TiO 2 -Al-B system. Finally, the effect of SiC addition on the microstructure and mechanical properties of the composites fabricated from the TiO 2 -Al-B and TiO 2 -Al-B-CuO systems was also investigated.

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“…We know the band gap of CZTS can be varied by changing the compositions of the constituent elements [16][17][18] and many defects form in the CZTS crystal [19]. We, then, considered that the CZTS composition changed partly for 150 min preheated sample.…”

Section: Photoluminescence Measurement Resultsmentioning

confidence: 99%

“…Figures 4 and 5 show the PL spectra of the samples preheated for 20 and 150 min. Since the bandgap energy of CZTS is about 1.5 eV [16][17][18], the observed PL signals are due to band to impurity or donor to accepter transitions. For 20 min preheated sample, the peak energies for three curves with different measuring positions were at 1.265 eV.…”

Section: Characterization Of Electrodeposited Cztsmentioning

confidence: 96%

Effect of preheating time on uniformity of electrodeposited Cu₂ZnSnS₄ thin films studied by carrier lifetime and photoluminescence measurements

Hamada

Fukuyama

Jiang

et al. 2015

Phys. Status Solidi C

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Cu2ZnSnS4 (CZTS) is paid attention to the low‐cost and nontoxic solar cell material. In this study, CZTS thin film was deposited by using an electrodeposition technique followed by a sulfurization after preheating the deposited metallic precursor layer. We investigated the film properties of CZTS thin films for understanding the effect of preheating time on the photovoltaic properties such as carrier lifetime and recombination mechanism by using a microwave photoconductivity decay (μ‐PCD) and a photoluminescence (PL) measurement. The results of the μ‐PCD measurements showed that carrier lifetime increased with increasing the preheating time and longer carrier lifetime was observed in a part of deposited thin film. The PL measurements showed the peak energy shift to lower energy region by a surface position of the sample preheated for 150 min. We found the CZTS crystal quality improved but the homogeneity worsened with increasing the preheating time. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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A novel technique for fabricatingin situ Al2O8/Ti x Al y composites

Cited by 26 publications

References 2 publications

Effect of heat treatments on In-Situ Al2O3/TiAl3 composites produced from squeeze casting of TiO2/A356 composites

Effect of heat treatments on In-Situ Al2O3/TiAl3 composites produced from squeeze casting of TiO2/A356 composites

In Situ ceramic particle-reinforced aluminum matrix composites fabricated by reaction pressing in the TiO2 (Ti)-Al-B (B2O3) systems

Effect of preheating time on uniformity of electrodeposited Cu₂ZnSnS₄ thin films studied by carrier lifetime and photoluminescence measurements

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A novel technique for fabricatingin situ Al2O8/Ti x Al y composites

Cited by 26 publications

References 2 publications

Effect of heat treatments on In-Situ Al2O3/TiAl3 composites produced from squeeze casting of TiO2/A356 composites

Effect of heat treatments on In-Situ Al2O3/TiAl3 composites produced from squeeze casting of TiO2/A356 composites

In Situ ceramic particle-reinforced aluminum matrix composites fabricated by reaction pressing in the TiO2 (Ti)-Al-B (B2O3) systems

Effect of preheating time on uniformity of electrodeposited Cu2ZnSnS4 thin films studied by carrier lifetime and photoluminescence measurements

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Effect of preheating time on uniformity of electrodeposited Cu₂ZnSnS₄ thin films studied by carrier lifetime and photoluminescence measurements