Porous TiB2 ceramics have been fabricated by compacting TiB2 powders with cold isostatical pressing, followed by pressureless sintering. The microstructural feature, relative density, flexural strength, and fracture toughness were investigated. The experimental results revealed that the porosity of the fabricated porous TiB2 was controllable between ∼ 50 and ∼ 84 per cent depending on the sintering temperature and initial compacted pressures. The flexural strength and fracture toughness were improved with the increased relative density. The improved mechanical properties of the sintered porous TiB2 were attributed to the enhanced neck bonding and growth.
PengH. X.FanZ.EvansJ. R. G.BusfieldJ. J. C.Microstructure of ceramic foams. J. Eur. Ceram. Soc., 2000, 20, 807–813.
2.
CorbinS. F.ApteP. S.Engineered porosity via tap casting, lamination and the percolation of pryolyzable particulates. J. Am. Ceram. Soc., 1999, 82, 1693–1701.
3.
OhS. T.TajimaK. I.AndoM.OhjiT.Strengthening of porous alumina by pulse electric current sintering and nanocomposite processing. J. Am. Ceram. Soc., 2000, 83, 1314–1316.
4.
FukasawaT.AndoM.OhjiT.KanzakiS.Synthesis of porous ceramics with complex pore structure by freeze-dry processing. J. Am. Ceram. Soc., 2001, 84, 230–232.
5.
WangJ. H.GanM.ShiJ. X.Detection and characterization of penetrating pores in porous materials. Mater. Charact., 2007, 58, 8–12.
6.
KamalM. M.MonhamadA. A.Combustion in porous media. Proc. IMechE, Part A: J. Power and Energy, 2006, 220, 487–508.
7.
AmirM.RohwerK.Effect of oscillation on skin friction drag under the influence of diverse pressure gradients. Proc. IMechE, Part G: J. Aerospace Engineering, 2007, 221, 831–845.
8.
HongC. Q.HanJ. C.ZhangX. H.MengS. H.Preparation and thermal ablation behavior of titanium diboride/(copper, nickel) C4 material. Mater. Sci. Eng. A, 2007, 447, 95–98.
9.
DaleH.DavidJ. G.Mechanical properties of a partially sintered alumina. J. Eur. Ceram. Soc., 1995, 15, 769–775.
10.
OhS.-T.TajimaK.-I.AndoM.OhjiT.Fabrication of porous Al2O3 by microwave sintering and its properties. Mater. Lett., 2001, 48, 215–218.
11.
OhI.-H.NomuraN.MasahashiN.HanadaS.Mechanical properties of porous titanium compacts prepared by powder sintering. Script. Mater., 2003, 49, 1197–1202.
12.
SheJ. H.OhjiT.Fabrication and characterization of highly porous mullite ceramics. Mater. Chem. Phys., 2003, 80, 610–614.
13.
MathewsT.MatthewsG. P.HuggettS.Estimating particle size distributions from a network model of porous media. Powder Technol., 1999, 104, 169–179.
14.
SheJ. H.YangJ.-F.KondoN.High-strength porous silicon carbide ceramics by an oxidation-bonding technique. J. Am. Ceram. Soc., 2002, 85, 2852–2854.
15.
DengZ.-Y.YangJ.-F.BeppuY.Effect of agglomeration on mechanical properties of porous zirconia fabricated by partial sintering. J. Am. Ceram. Soc., 2002, 85, 1961–1965.
16.
DengZ. Y.FukasawaT.AndoM.ZhangG. J.OhjiT.Bulk alumina support with high tolerant strain and its reinforcing mechanisms. Acta Mater., 2001, 49, 1939–1946.
17.
FangY.AgrawalD. K.RoyD. M.Fabrication of porous hydroxyapatite ceramics by microwave processing. J. Mater. Res., 1992, 7, 490–494.
18.
BhaumikS. K.DivakarC.SinghA. K.UpadhyayaG. S.Synthesis and sintering of TiB2 and TiB2-TiC composite under high pressure. Mater. Sci. Eng. A, 2000, 279, 275–281.
19.
WangW. M.FuZ. Y.Influence of hot pressing temperature and time on microstructure and mechanical properties of TiB2 ceramics. J. Eur. Ceram. Soc., 2002, 22, 1045–1049.
20.
RiceR. W.Comparison of stress concentration versus minimum solid area based mechanical property-porosity relations. J. Mater. Sci., 1993, 28, 2178–2190.
21.
FlinnB. D.BordiaR. K.ZimmermannA.RodelJ.Evolution of defect size and strength of porous alumina during sintering. J. Eur. Ceram. Soc., 2000, 20, 2561–2568.
22.
RiceR. W.Limitations of pore-stress concentration on the mechanical properties of porous materials. J. Mater. Sci., 1997, 32, 4731–4736.
23.
RiceR. W.Evaluation and extension of physical property-porosity based on minimum solid area models. J. Mater. Sci., 1996, 31, 102–118.
24.
DengZ.-Y.SheJ. H.InagakiY.Reinforcement by crack-tip blunting in ceramics. J. Eur. Ceram. Soc., 2004, 24, 2055–2059.
