Properties of SiC particulate preforms based on different pore-forming agents and bonding methods for making SiC/Al composites

Abstract

The preforms with high SiC volume fraction (>50%) were successfully fabricated by two bonding methods. Moreover, the dimensional change, compressive strength, and microstructure of SiC preforms were investigated, and the bonding mechanism among SiC particulates in preforms was also discussed. Results show that, after heating to 1 100 °C and holding for 2 h, a uniform and interconnected structure in the SiC preforms can be obtained by using starch, stearic acid, and graphite respectively as the pore-forming agents, which benefits the subsequent infiltration by the molten metals. More neck-like-jointing among SiC particulate by using graphite as the pore-forming agent improves the dimensional accuracy and compressive strength of the preform. Besides, the properties of the preforms by the binder bonding are better than those by the oxidation bonding, which is mainly because the mixed neck-like-jointing and binder at high temperature provide effective bonding together.

Keywords

SiC preforms / pore-forming agent / bonding methods / properties

References

[1] Hale D K. The Physical Properties of Composite Materials[J]. J. Mater. Sci., 1976, 11(11): 2 105-2 141.

[2] Kaczmar J W, Pietrzak K, Wlosinski W. The Production and Application of Metal Matrix Composite Materials[J]. J. Mater.Process. Technol., 2000, 106(1–3): 58-67.

[3] Zweben C. Advances in High-preformance Thermal Management Materials: A Review[J]. J. Adv. Mater., 2007, 39: 3-10.

[4] Biswas D K, Gatica J E, Tewari S N. Dynamic Analysis of Unidirectional Pressure Infiltration of Porous Preforms by Pure Metals[J]. Metall. Mater. Trans. A., 1998, 29: 377-385.

[5] Shen X Y, Ren S B, He X B, et al. Study on Methods to Strengthen SiC Preforms for SiC/Al Composites by Pressureless Infiltration[J]. J. Alloys Compd., 2009, 468(1–2): 158-163.

[6] Pech-Canul M I, Makhlouf M M. Processing of Al-SiC Metal Matrix Composites by Pressureless Infiltration of SiC Preforms[J]. J. Mater. Synth. Process., 2000, 8(1): 35-52.

[7] Xiong H P, Xiong B W, Yu H, et al. Effects of Binders on Dimensional Accuracy and Mechanical Properties of SiC Particulates Preforms Fabricated by Selective Laser Sintering[J]. Composites Part B, 2013, 44(1): 480-483.

[8] Shi Z L, Lee J, Zhang D, et al. The Passive-oxidized Behavior of SiC Particulate and Their Jointing Characteristics[J]. J. Mater. Process. Technol., 2001, 110(2): 127-131.

[9] Ureña A, Martínez E E, Rodrigo P, et al. Oxidation Treatments for SiC Particulate Used as Reinforcement in Aluminium Matrix Composites[J]. Compos. Sci. Technol., 2004, 64(12): 1 843-1 854.

[10] Satoh A. Water Glass Bonding[J]. Sensor. Actuators. A, 1999, 72(2): 160-168.

[11] Lidén E, Karlsson S, Tokarz B. Silica Sols as Refractory Fibre Binders[J]. J. Eur. Ceram. Soc., 2001, 21(6): 795-808.

[12] Xiong B W, Yu H, Xu Z F, et al. Study on Dual Binders for Fabricating SiC Particulate Preforms Using Selective Laser Sintering[J]. Composites Part B, 2013, 48: 129-133.

[13] Lee H S, Hong S H. Pressure Infiltration Casting Process and Thermophysical Properties of High Volume Fraction SiCp/Al Metal Matrix Composites[J]. Mater. Sci. Tech., 2003, 19(8): 1 057-1 064.

[14] Zhang H W, Loukus J, Loukus A. Improvement of the Bonding Interface in Hybrid Fiber/particle Preform Reinforced Al Matrix Composite[J]. Mater. Lett., 2009, 63(2): 310-312.

[15] Živcová Z, Gregorová E, Pabst W, et al. Thermal Conductivity of Porous Alumina Ceramics Prepared Using Starch as a Pore-forming Agent[J]. J. Eur. Ceram. Soc., 2009, 29(3): 347-353.

[16] Kim J G, Cho W S, Sim J H. Effect of Potato-starch on the Microstructure and PTCR Characteristics of^(Ba,Sr)TiO₃[J]. J. Mater. Sci. Mater. Electron., 2002, 13: 497-501.

[17] Romano P, Velasco F J, Torralba J M, et al. Processing of M2 Powder Metallurgy High-speed Steel by Means of Starch Consolidation[J]. Mater. Sci. Eng. A, 2006, 419(1–2): 1-7.

[18] Mao X J, Wang S W, Shimai S. Porous Ceramics with Tri-modal Pores Prepared by Foaming and Starch Consolidation[J]. Ceram. Int., 2008, 34(1): 107-112.

[19] Zhang Q, Ma X Y, Wu G H. Interfacial Microstructure of SiCp/Al Composite Produced by the Pressureless Infiltration Technique[J]. Ceram. Int., 2013, 39(5): 4 893-4 897.

[20] Zou A H, Zhou X L, Li D S, et al. The Influence of SiCp Oxidized on the Interface Layer and Thermal Conductivity of SiCp/Al Composites[J]. Compos. Interface, 2013, 20(2): 107-117.