Reactive Melt Infiltration of Boron Containing Fiber Reinforced Preforms Forming a ZrB 2 Matrix

Synthesis of an Al 2O 3/Al co-continuous composite by reactive melt infiltration

Reaction mechanism and microstructure development of ZrSi2 melt-infiltrated Cf/SiC-ZrC-ZrB2 composites: The influence of preform pore structures

Reactive melt infiltration of silicon-molybdenum alloys into microporous carbon preforms

Surface tension measurement of Ti–Zr and Ti–Hf alloys at high-temperature by the pendant drop method

To attain the goal of receiving the well toughened ceramic matrix composite material for radioactive jackets to protect from nuclear radioactivity for commercial and defense applications. This research task is initiated to prepare the composites by preparing the Al-Si alloy at different propositions and infiltrate the alloy into the B4C pellets at different temperatures. This task dealt with the methodology of reactive melt infiltration (RMI) technique and processing of ceramic matrix composites in lightweight. Moreover, it registered the phenomenon and factors influencing the infiltration process and characterization of constituents of the ceramic matrix infiltrated composites. Fine particles of 10 μm boron carbide powder (B4C) was characterized by determining the free carbon content and thermal behavior experiments. By the addition of binder, the densification of porous B4C green preforms and its pressing efficiency were analyzed. Four sets of Si-Al alloys were produced with various combinations and smelting parameters; and were investigated its property through XRD/EDS tests and SEM images. Nominal 50% porosity B4C preforms were infiltrated by various proportions of hypereutectic Si-Al alloys at various batches through pressureless reactive melt infiltration process under inert argon atmosphere with different infiltration temperatures and infiltration duration. The poor infiltration, partial infiltration, changes in physical aspect, wetting phenomena were also discussed.

C/C–SiC–ZrC composites fabricated by reactive melt infiltration with Si0.87Zr0.13 alloy

HfB2-SiC ceramics fabricated by reactive melt infiltration and its long-term oxidation behavior at 1650°C

Water vapor corrosion behaviors of Yb2SiO5-Yb2O3-Si-SiC ceramic fabricated by tape casting and reactive melt infiltration

Ablation behaviour of Csf/ZrB2-SiC composites fabricated by direct ink writing and reactive melt infiltration

Synthesis of Ti3SiC2-based materials by reactive melt infiltration

Complex structure reaction-bonded silicon carbide (RB-SiC) can be prepared by reactive melt infiltration (RMI) and digital light processing (DLP). However, the strength and modulus of RB-SiC prepared by DLP are not sufficient, due to its low solid content (around 40 vol.%), compared with the traditional fabrication techniques (solid content > 60 vol.%). With this understanding, a new method to improve the properties of RB-SiC was proposed, by the impregnation of composite precursor into the porous preform. The composite precursor was composed of phenolic (PF) resin and furfuryl alcohol (FA). PF and FA were pyrolyzed at 1850 °C to obtain amorphous carbon and graphite into the porous preform, respectively. The effects of multiphase carbon on the microstructure and performance of RB-SiC was studied. When the mass ratio of PF to FA was 1/4, the solid content of RB-SiC increased from 40 vol.% to 68.6 vol.%. The strength, bulk density and modulus were 323.12 MPa, 2.94 g/cm3 and 348.83 Gpa, respectively. This method demonstrated that the reaction process between liquid Si and carbon could be controlled by the introduction of multiphase carbon into the porous preforms, which has the potential to regulate the microstructure and properties of RB-SiC prepared by additive manufacturing or other forming methods.

Vat photopolymerization of large-aperture high performance SiC mirror through multiphase carbon infiltration modification

Carbon fiber reinforced silicon carbide matrix(C/SiC)braking materials were prepared by a reactive melt infiltration method.The microstructure characteristics of SiC were studied by means of optical microscope,scanning electron microscope and transmission electron microscope in combination with component analysis by X-ray diffraction.Results show thatβ-SiC zone usually forms inside the short-cut fabric,around the needling fibers,and among the fiber bundles in the non-woven web.Residual Si locates among SiC grains.In C/SiC composites,there exist two different areas of SiC,one is coarserβ-SiC grains between 5-15μm at the SiC-Si interface,and the other is a zone of a fine grainedβ-SiC layer with dimension of about 100nm at the SiC-C interface.

Study on the gradient characteristics of reactive melt infiltration C/SiC-HfC composite

Enhanced anti-ablation performance of carbon/carbon composites modified with ZrC-SiC