Tecnologia em Metalurgia, Materiais e Mineração
Tecnologia em Metalurgia, Materiais e Mineração
Artigo Original


Onbattuvelli, Valmikanathan; Laddha, Sachin; Park, Seong-Jin; Souza, Jupiter Palagi de; Atre, Sundar Vedanarayan

Downloads: 0
Views: 999


Silicon carbide (SiC) exhibits many functional properties that are relevant to applications in electronics, aerospace, defense and automotive industries. However, the successful translation of these properties into final applications lies in the net-shaping of ceramics into fully dense microstructures. Increasing the packing density of the starting powders is one effective route to achieve high sintered density and dimensional precision. The present paper presents an in-depth study on the effects of nanoparticle addition on the powder injection molding process (PIM) of SiC powder-polymer mixtures. In particular, bimodal mixtures of nanoscale and sub-micrometer particles are found to have significantly increased powder packing characteristics (solids loading) in the powder-polymer mixtures. The influence of nanoparticle addition on the multi-step PIM process is examined. The above results provide new perspectives which could impact a wide range of materials, powder processing techniques and applications.


Powder injection molding, Nanoparticles, Thermal management, SiC


1 GERMAN, R. M.; BOSE, A. Injection molding of metal and ceramics. New Jersey: MPIF, 1997.

2 ONBATTUVELLI, V. P. et al. Properties of SiC and AlN feedstocks for the powder injection moulding of thermal management devices . PIM International, v. 4, n. 3, p. 64-70, Sep. 2010.

3 DABAK, T.; YUCEL, O. Shear viscosity behavior of highly concentrated suspensions at low and high shear-rates. Rheologica Acta, v. 25, n. 5, p. 527-33, Sep. 1986. http://dx.doi.org/10.1007/BF01774404

4 BAKAN, H. I. Injection moulding of alumina with partially water soluble binder system and solvent debinding kinetics. Materials Science and Technology, v. 23, n. 7, p. 787-91, July 2007. http://dx.doi. org/10.1179/174328407X161196

5 HWANG, K. S.; SHU, G. J.; LEE, H. J. Solvent debinding behavior of powder injection molded components prepared from powders with different particle sizes. Metallurgical and Materials Transactions A, v. 36, p.161-7, Jan. 2005. http://dx.doi.org/10.1007/s11661-005-0148-6

6 SURNEV, S.; LEPKOVA, D.; YOLEVA, A. Influence of the sintering additives on the phase composition and the thermal conductivity of aluminium nitride ceramics. Materials Science and Engineering B, v. 10, n. 3, p. 35-40, 1991. http://dx.doi.org/10.1016/0921-5107(91)90092-A

7 MOLISANI, A. L. et al. Effects of CaCO3 content on the densification of aluminum nitride. Journal of the European Ceramic Society, v. 26, n. 15, p. 3431-40, 2006. http://dx.doi.org/10.1016/j.jeurceramsoc.2005.08.010

8 GERMAN, R. M. Sintering theory and practice. New York: John Wiley and Sons, 1996.

9 ZHOU, H. et al. Effects of binary additives B2O3–Y2O3 on the microstructure and thermal conductivity of aluminum nitride ceramics. Journal of Materials Science, v. 34, n. 24, p. 6165-8, Dec. 1999. http://dx.doi. org/10.1023/A:1004782223271

10 LI, X. L. et al. AlN ceramics prepared by high-pressure sintering with La2O3 as a sintering aid. Journal of Alloys and Compounds, v. 463, n. 1-2, p. 412-6, Sep. 2008. http://dx.doi.org/10.1016/j.jallcom.2007.09.050

11 KUME, S. et al. Effects of annealing on dielectric loss and microstructure of aluminum nitride ceramics Journal of American Ceramic Society, v. 88, n. 11, p. 3229-31, Nov. 2005. http://dx.doi.org/10.1111/j.1551-2916.2005.00556.x

12 ONBATTUVELLI, V. P.; ATRE, S. V. Review of net shape fabrication of thermally conducting ceramics. Materials and Manufacturing Processes, v. 26, n.11, p. 832-45, 2011. http://dx.doi.org/10.1080/10426914.2010.515646

588696997f8c9dd9008b45f2 tmm Articles
Links & Downloads

Tecnol. Metal. Mater. Min.

Share this page
Page Sections