Damping Capacity and Storage Modulus of SiC Matrix Composites Infiltrated by AlSi Alloy

Abstract

In this paper, we describe how an aluminum alloy-reinforced silicon carbide ceramic matrix composite (SiCCMC) with excellent damping capacity and storage modulus was fabricated by infiltration. The effects of silicon (Si) on the microstructure and damping capacity of the composite were studied. The interface bonding and damping mechanism involved were also discussed. The results show that composites with high damping capacity can be obtained by infiltrating SiC ceramics with aluminum alloy. The residual Si in the SiC ceramic had little effect on the damping capacity, and it provided the passage of aluminum alloy into the interior of the SiC ceramic. The aluminum atoms penetrate the SiC particles by diffusion. Optimal composite damping capacity was obtained when the Si content in the aluminum alloy was 15 wt. %, because the AlSi/SiC interface friction dissipated most of thermal energy. Ti3SiC2 formed on the surface had little effect on the damping capacity. Additionally, by changing the Si content in the aluminum alloy, the strength and damping capacity of the composites can be controlled.

Structural analysis, mechanical and damping behaviour of Al-Zn based composites reinforced with Cu and SiC particles

“…This mechanism appears somewhat inhibited for the Al-Zn reinforced with 8 wt.% Cu. The higher damping capacity in the Al-Zn composite reinforced 8 wt.% SiC compared with the composite composition reinforced containing 8 wt.% Cu, can be linked to dislocation damping and the intrinsic damping phenomena exhibited by multiphase systems (in this case, the matrix and reinforcements) [10]. Silva Prasad et al [19] reported that SiC powder has damping capacity higher than that of Ferrous based metallic reinforcements.…”

“…Flat shaped rectangular bar samples with dimensions of 55 mm  5.0 mm  2.0 mm were machined for the test. The DMA which operates on three-point bending mode, generated data for storage modulus (dynamic modulus) (É) and loss modulus (Ë), which were used for analysis of the damping capacity (tan d) using equation ( 3) [10]. The analysis was performed at a strain amplitude (Ɛ) of 10 mm, vibration frequencies (f) of 1 Hz, temperature range (ƭ) of 30-200 °C, and heating rate (Ʈ) of 8 K/min.…”

“…As replacement in automobile engine components, it specifically offers combination of high strength, corrosion and wear resistance, high toughness and thermal fatigue resistance which are the material properties that are critical for satisfactory service function [7,8]. However, most Aluminium based alloys with the exception Al-Zn series have low damping capacity, and require reinforcement selection to meet the service damping capacity requirements [9,10]. Ceramics which are conventionally used as reinforcements have been noted to lower ductility and toughness considerably in comparison to what is obtainable in the unreinforced Al matrices [11].…”

Wear and Corrosion Resistance of AlSi10Mg–CP–Ti Metal–Metal Composite Materials Produced by Electro-Sinter-Forging

“…Table 6 summarizes the Raman shifts observed in samples Ti20Al80 and Ti80Al20, along with their indexing. Raman Shift Indexing Ti20-AlSi [cm −1 ] Species Corroded Al Lightly-corroded Al Titanium AlCl4 -* , [a] 123 122 122 Silicon is characterized by a well-known specific peak at 520 cm −1 and a secondary peak of about 950 cm −1 [43,44]. Both peaks were found in Al corroded and lightly-corroded Al areas.…”

“…Silicon is characterized by a well-known specific peak at 520 cm −1 and a secondary peak of about 950 cm −1 [43,44]. Both peaks were found in Al corroded and lightly-corroded Al areas.…”