Role of MgF<sub>2</sub> addition on high energy ball milled kalsilite: Implementation as dental porcelain with low temperature frit

doi:10.1007/s40145-014-0125-x

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Abstract

Porcelain fused to metal (PFM) has received great attention over the last few years due to its importance in the dentistry. Kalsilite (K₂O·Al₂O₃·SiO₂) is a high thermal expansion porcelain, suitable for bonding to metals. However, kalsilite is a metastable phase which gets converted into crystalline leucite upon heating. In the current work feasibility of developing stable kalsilite phase, dispersion of MgF₂ in it as an additive and using mechanochemical synthesis are studied. Micro fine dental material has been formulated by mixing prepared kalsilite with low temperature frit (LTF) in different ratio. The crystalline phases evolved in fired powders are characterized by powder X-ray diffraction (XRD) technique. Kalsilite with different ratio of LTF has been cold pressed and heat treated to examine its coefficient of thermal expansion (CTE), flexural strength, apparent porosity (AP), bulk density (BD) and microstructure. Results indicate that MgF₂ addition and high milling duration help in kalsilite stabilization. Temperature also plays an important role in this stabilization, and at 1100 ℃ single phase kalsilite formation is observed. Present outcomes demonstrate that it is easily possible to synthesize a stable single phase kalsilite with desirable properties.

Key words： kalsilite porcelain fused to metal (PFM) dental ceramic mechanochemical synthesis thermal expansion X-ray diffraction (XRD)

Received: 17 June 2014 Published: 12 June 2015

Corresponding Authors: Pattem Hemanth KUMAR

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	Pattem Hemanth KUMAR
	Abhinav SRIVASTAVA
	Vijay KUMAR
	Nandini JAISWAL
	Pradeep KUMAR
	Vinay Kumar SINGH

Cite this article:

Pattem Hemanth KUMAR,Abhinav SRIVASTAVA,Vijay KUMAR, et al. Role of MgF₂ addition on high energy ball milled kalsilite: Implementation as dental porcelain with low temperature frit[J]. Journal of Advanced Ceramics, 2014, 3(4): 332-338.

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http://jac.tsinghuajournals.com/EN/10.1007/s40145-014-0125-x OR http://jac.tsinghuajournals.com/EN/Y2014/V3/I4/332

Batch composition of different weight percentage of kalsilite and LTF samples

XRD patterns of the sample milled for 3 h at different firing temperatures.

XRD patterns of the sample containing 2 wt% of MgF₂ milled for 3 h at different firing temperatures.

XRD patterns of the sample milled for 6 h at different firing temperatures.

XRD patterns of the sample containing 2 wt% of MgF₂ milled for 6 h at different firing temperatures.

CTE curves of the samples with different weight percentage of kalsilite and LTF.

CTE curves of the samples with different weight percentage of kalsilite–2 wt% MgF₂ and LTF.

Flexural strength of K₁₀₀₀ and K_M1000 with different weight percentage of kalsilite and LTF.

BD and AP of the samples with different weight percentage of kalsilite and LTF.

Scanning electron micrographs of kalsilite with (K_M1000) and without (K₁₀₀₀) MgF₂ with different weight percentage of LTF in different magnification: (a, b) K_M1000-25/75; (c, d) K_M1000-30/70; (e, f) K_1000-25/75; (g, h) K_1000-30/70.

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