Preparation and characterization of new dental porcelains, using K-feldspar and quartz raw materials. Effect of B2O3 additions on sintering and mechanical properties

Harabi, Abdelhamid; Guerfa, Fatiha; Harabi, Esma; Ben-Hassine, M.; Foughali, Lazhar; Zaiou, Soumia

doi:10.1016/j.msec.2016.03.067

Cited by 17 publications

(7 citation statements)

References 58 publications

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“…6. Consequently, this flexural strength value is extremely higher than that reported by other works carried out on similar based ceramics [29,[57][58][59][60][61]. This value (203 MPa) is also significantly higher than those reported in [57] (40 MPa) and [60] (36 MPa) for their prepared membrane supports (application of anorthite), although they have been sintered at relatively higher temperatures (≥1450 °C).…”

Section: Resultsmentioning

confidence: 51%

Mechanical properties of anorthite based ceramics prepared from kaolin DD2 and calcite

et al. 2017

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Anorthite is widely spread in nature and belongs to the plagioclase group of rock forming minerals. Plagioclases represent a continuous series of solid solutions between anorthite (CaO.Al 2 O 3 .2SiO 2 ) and albite (Na 2 O.Al 2 O 3 .6SiO 2 ) and form an enormous group of triclinic minerals. harabi52@gmail.com, Zaiou_21@yahoo.fr, guechia@yahoo.fr, semouni84@gmail.com, kanour17@yahoo.fr, foughali_lazhar@yahoo.fr, zouaisouheila@yahoo.fr, mezahif@yahoo.fr, guerfatiha@gmail.com Mineralogically, anorthite is reported as a chemically weak mineral, resulting in a basic reaction when dissolved into boiling water, while strong acidic and basic solutions dissolve it. Glass-ceramics and ceramics with crystalline anorthite are mainly used in electrical, thermo-mechanical and water resistance applications [1][2][3][4]. Anorthite is an important technical ceramic material that has good physical properties, such as very low thermal expansion coefficient, low dielectric constant and loss, good thermal shock resistance, and high creep resistance at high AbstractGood quality ceramics costs a lot that has limited their use in developing countries. This work was devoted to prepare low-cost and good quality anorthite based ceramics. The proposed composition was 80 wt% kaolin (DD2 type) and 20 wt% calcium oxide (CaO). The choice of these raw materials was dictated by their natural abundance coupled with a modified milling system, as another interesting advantage. Previous studies have shown that a simple vibratory multidirectional milling system using bimodal distribution of highly resistant ceramic milling elements has been successfully applied for obtaining fine powders. The influence of the relatively lower sintering temperature, ranging from 800 to 1100 °C, on the porosity and the average pore size (APS) have been investigated. The APS and the porosity values of samples sintered at 950 °C were about 1 μm and 4%, respectively. The best Vickers microhardness and 3-point bending strength values for these sintered samples, using this proposed milling system, were 7.1 GPa and 203 MPa, respectively. Finally, the crystalline phase evolution during heat treatment was investigated by X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy techniques.

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Section: Resultsmentioning

confidence: 51%

Mechanical properties of anorthite based ceramics prepared from kaolin DD2 and calcite

et al. 2017

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“…The addition of B 2 O 3 , CaO, and BaO reduced the melting point of the frit, while B 2 O 3 and CaO additionally increased the elasticity. [ 20,27,31 ] Frits G1–G3 had the same multicomponent oxide system as frits F1–F3, but did not contain BaO and K 2 O. As expected, [ 20 ] the replacement of K 2 O with MgO (as magnesium carbonate) to obtain frit H made the enamels harder to melt and reduced their elasticity.…”

Section: Resultsmentioning

confidence: 61%

“…These frits also contained additions of Al 2 O 3 , which increased the hardness, strength and chemical resistance of the frits. [ 20,27,31 ] Finally, ZrO 2 , which improves heat resistance, [ 20,27,31 ] was also added to frits V1‒V3 (Al 2 O 3 –SiO 2 –Na 2 O–B 2 O 3 –ZrO 2 –CaO–K 2 O–TiO 2 –Li 2 O–V 2 O 5 ).…”

Section: Resultsmentioning

confidence: 99%

Development and analysis of frits for enamelling AA2024, AA6082 and AA7075 aluminium alloys

Bukovec

Xhanari

Finšgar

2020

Materials & Corrosion

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This study reports the development of frits with different composition, time, and firing temperature for mitigating the corrosion of AA2024, AA6082, and AA7075 aluminium alloys in chloride-containing solutions. The melting points of the frits were determined using a heating microscope, while the thermal expansion was measured using dilatometry. Several frits were prepared, of which seven were coated on AA2024, AA6082 and AA7075 aluminium alloys. The corrosion resistance of the coated samples was tested in 5 wt % NaCl solution at 25°C using potentiodynamic curve measurements. The corrosion resistance of the coated samples increased compared with the respective uncoated aluminium alloys. The composition and in-depth homogeneity of the best-performing coated samples were confirmed using a gas cluster ion beam sputtering source associated with X-ray photoelectron spectroscopy analysis. Furthermore, O 2 + sputtering was performed in association with time-of-flight secondary ion mass spectrometry to describe the threedimensional composition of the frits.

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“…Many local raw materials, like kaolin, feldspar, quartz, calcite and dolomite, are very abundant and they are used in industrial ceramics because of availability and low cost. Several research studies have already been published about the valorization of raw materials for the production of ceramic membranes [1], dental porcelains [2], bioceramics [3], technical porcelain [4], glass [5] and glass-ceramic [6]. Therefore, the exploitation of new raw material resources satisfying the criteria of ceramic industries is important.…”

Section: Introductionmentioning

confidence: 99%

Preparation, microstructure studies and mechanical properties of glazes ceramic sanitary ware based on kaolin

et al. 2021

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In this paper, the use of local kaolin coming from Djebel Debbagh (denoted DD1) in the composition of ceramic glazes for sanitary ware was examined. Because of its natural abundance, low price and good characteristics, this kaolin represents an interesting economic alternative to other mineral clays. The chemical composition showed that this kaolin contains 38.49 wt.% Al2O3 and 44.85 wt.% SiO2. Two glazes based on kaolin DD1 denoted as GaDD1 and GbDD1 were prepared with conventional ceramic processing techniques at temperature 1250 oC. As a reference, another glaze (Gref) based on kaolin Remblend was also prepared in the same conditions. The samples were characterized with X-ray diffraction and Scanning Electron Microscope. The results revealed that zircon and quartz are the crystalline phases present in these glazes. In the sample GaDD1, it was found that the degree of whiteness is very high and reaches 93.30 %. However, the water absorption coefficient is low which is about 0.19 ? 0.04 %. In addition, the flexural strength and the Vickers microhardness are respectively, about 56.07 ? 5.61 MPa and 7952.80 ? 101.76 MPa. These properties are compatible with those of the glaze reference Gref and commercial sanitary ware glazes, indicating the potential use of kaolin DD1 in the production of glazed ceramic for sanitary ware applications.

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Preparation and characterization of new dental porcelains, using K-feldspar and quartz raw materials. Effect of B2O3 additions on sintering and mechanical properties

Cited by 17 publications

References 58 publications

Mechanical properties of anorthite based ceramics prepared from kaolin DD2 and calcite

Mechanical properties of anorthite based ceramics prepared from kaolin DD2 and calcite

Development and analysis of frits for enamelling AA2024, AA6082 and AA7075 aluminium alloys

Preparation, microstructure studies and mechanical properties of glazes ceramic sanitary ware based on kaolin

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