Preparation of SiC p /Al composite–bismuthate glass material and its application in mirror blanks

2018

Scanning

Self Cite

The in-house developed bismuthate glass and the SiCp/Al composites with different volume fractions of SiC particles (namely, 60 vol.%, 65 vol.%, 70 vol.%, and 75 vol.%) were jointed by vacuum hot-pressing process. The novel material can be used for the space mirror. The SiCp is an abbreviation for SiC particle. Firstly, the SiCp/Al composites with different vol.% of SiC particle were manufactured by using infiltration process. In order to obtain a stable bonding interface, the preoxide layers were fabricated on the surfaces of these composites for reacting with the bismuthate glass. The coefficient of thermal expansion (CTE) was carried out for characterizing the difference between the composites and bismuthate glass. The sealing quality of the composites and the bismuthate glass was quantified by using shear strength testing. The optical microstructures showed the particles were uniformly distributed in the Al matrix. The SEM image shows that a smooth oxidation layer was generated on the SiCp/Al composite. The CTE testing result indicated that the higher the vol.% of the particles in the composite, the lower the CTE value. The shear strength testing result disclosed that SiCp/Al composite with relatively low CTE value was favorable to obtain a bonding interface with high strength.

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of the Different High Volume Fraction of SiC Particles on the Junction of Bismuthate Glass-SiC_p/Al Composite

2018

Scanning

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“…According to previous studies, the mechanical properties of mixed particles tend to signicantly affect the shape of the particles. 8,[18][19][20] Reinforcements with different shapes will cause different resistance of base deformation and load bearing capacity. Consequently, particles with different shape will cause different strengthen effects in mixed particles, which in turn will affect the cutting properties of the material.…”

Section: Simulation Of the Cutting Of Sic P /Al Compositesmentioning

confidence: 99%

“…7 Qu et al investigated the bonding mechanism, melting and expansion behavior of the SiC p /Al composite-bismuthate. 8 Lasri et al focused on the effect of cutting parameters on surface damage of the machined component and wear resistance. 9 Palanikumar analyzed the factors inuencing tool wear on the machining of glass-berreinforced plastic composites using coated cement carbide tools.…”

Section: Introductionmentioning

confidence: 99%

Machinability of a silicon carbide particle-reinforced metal matrix composite

et al. 2016

RSC Adv.

“…For the aerospace application, combination of glass and alloy was often achieved at relatively high temperature 1000°C after 15 min in the electric furnace. In our previous work [ 12 ], the glass was combined to the SiCp/Al composite matrix with high content SiC particles with 45 μ m, 8 μ m, and 2 μ m addition by preparing an alumina layer on the surface of SiCp/Al composite in the electric furnace. Selecting an optical grade SiCp/Al composite with high SiC content as a space mirror material is propitious to promote the integration of the mirror and its supporting structure.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Anodizing of SiCp/Al Composites with Relatively High Fraction of SiCp

2018

Scanning

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By properly proportioned SiC particles with different sizes and using squeeze infiltration process, SiCp/Al composites with high volume fraction of SiC content (Vp = 60.0%, 61.2%, 63.5%, 67.4%, and 68.0%) were achieved for optical application. The flexural strength of the prepared SiCp/Al composites was higher than 483 MPa and the elastic modulus was increased from 174.2 to 206.2 GPa. With an increase in SiC volume fraction, the flexural strength and Poisson's ratio decreased with the increase in elastic modulus. After the anodic oxidation treatment, an oxidation film with porous structure was prepared on the surface of the composite and the oxidation film was uniformly distributed. The anodic oxide growth rate of composite decreased with SiC content increased and linearly increased with anodizing time.