Effects of nucleation agent particle size on properties,crystallisation and microstructure of glass-ceramics in TiO 2 -ZrO 2 -Li 2 O-CaO- Al 2 O 3 -SiO 2 system

Abstract

The objective of this study was to evaluate the effects of P₂O₅ particle size distribution on the crystalline phases and microstructure of lithium disilicate glass-ceramics derived from the TiO₂-ZrO₂-Li₂O-CaO-Al₂O₃-SiO₂ system for dentistry applications. The samples were made via fusion and casting procedure. Crystallisation as well as the morphology and microstructure of the samples were investigated using X-ray diffraction, differential scanning calorimetric and scanning electron microscopy. The results showed that the crystallisation of the samples occurred in the range of 500-650°C. The main crystalline phase was lithium disilicate (Li₂Si₂O₅) along with Lithium metasilicate (Li₂SiO₃), spodumene [LiAl(SiO₃)₂], lithium orthophosphate (Li₃PO₄) and cristobalite as secondary phases. With decreasing size of P₂O₅ particles, the morphology of Li₂Si₂O₅ crystals was transformed from needle shaped to spherical-like and the mechanical property was improved. The optimal flexural strength of 280 MPa and microhardness of 620 HV were obtained at the lithium disilicate glass-ceramics with P₂O₅ nanoparticles.

Keywords

Dental ceramics Lithium disilicate Glass-ceramic Microstructure Crystallisation Mechanical properties

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References

Stookey

S. D.

: Ind. Eng. Chem., 1959, 51, 805.

Holand

and Beall

G. H.

: ‘Glass—ceramic technology’; 2002, Westerville, OH, the American Ceramics Society.

Harper

and McMillian

P. W.

: Phys. Chem. Glasses, 1972, 13, (4), 97.

Zheng

, Wen

, Song

and Huang

X. X.

: Acta Mater., 2008, 56, 549–558.

Wen

, Zheng

and Song

: Acta Mater., 2007, 55, 3583–3591.

Holand

, Apel

, C. Hoen van't and V. Rheinberger: Non-Cryst. Solids, 2006, 352, 4041–4050.

Borom

M. P.

, Turkalo

A. M.

and Doremus

R. H.

: Am. Ceram. Soc., 1975, 58, 385–391.

Buhler-Zemp

and Volkel

: interner Bericht an Ivoclar Vivadent AG., 2005.

Albakry

, Guazzato

and Swain

M. V.

: Prosthet Dent., 2003, 89, 374–380.

10.

Berge

H. X.

, Sorensen

J. A.

and Edelhoff

: JDR, 2001, 80, 57.

11.

Sorensen

J. A.

, Berge

H. X.

and Edelhoff

: JDR, 2000, 79, 217.

12.

Kappert

H. F.

: interner Bericht an Ivoclar Vivadent AG., 2000.

13.

Hammetter

W. F.

and Loehman

R. E.

: Am. Ceram. Soc., 1987, 70, 577.

14.

James

P. F.

and McMillan

P. W.

: Phys. Chem. Glasses, 1970, 11, 14.

15.

Iqbal

, Lee

W. E.

, Holland

and James

P. F.

: Mater. Sci., 1999, 34, 4399.

16.

Muller

: in ‘Low thermal expansion glass ceramics’, (ed. Bach

), 13–25; 1995, Berlin, Springer-Verlag.

17.

Wang

and Xu

: Non-Cryst. Solids, 1986, 80, 237–242.

18.

Davkova

, Zafirovski

, Pocev

and Zlatanovic

: Glass. Technol, 2000, 41, 197–198.

19.

Beall

G. H.

, Duke

D. A.

and Transparent

: Mater. Sci., 1969, 4, 340–352.

20.

Petzoldt

and Pannhorst

: Non-Cryst. Solids, 1991, 129, 191–198.

21.

Beall

G. H.

and Pinckney

L. R.

: Ant Ceram. Soc., 1999, 82, 5–16.

22.

Thompson

J. Y.

, Anusavice

K. J.

, Balasubramaniam

and Mecholsky

J. J.

: Am. Ceram. Soc., 1995, 78, 3045–3049.

23.

Schneider

: ‘Engineered material handbook’, Vol. 4, ‘Ceramics and glass’, 870; 1991, Materials Park, OH, ASM International.

24.

McMillan

P. W.

, Phillips

S. V.

and Partridge

: Mater. Sci., 1966, 1, 269–279.