Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Ceramic

Effect Nano-SiC Additives on Physical and Mechanical Properties of Bauxite Refractories Used in Oil Treatment Units

S.A. Zaidan; H. H. Jasim

Engineering and Technology Journal, 2017, Volume 35, Issue 10, Pages 992-998

Refractory mixtures were prepared from: bauxite raw materials, grog and Kaolin. Different weight percentage of micro-SiC (5, 10, 15 and 20 wt%) and nano-SiC (2.5,5,7.5 and 10 wt%) was added to bauxite mixture to improve the refractories characteristics to suit the lining of oil treatment units. Semi-dry pressing used to forming cylindrical specimens with load (7 ton) and 25 mm in diameter after mixing the powder with 10 wt% Sodium Silicate as a binder. The specimens dried at (110 oC) for (2 h) and fired at (1400 oC) with soaking time (2 h). During firing process, some of nano-SiC powder oxidants and transformed to SiO2 glass phase with increasing mullite phase. Therefore; the bonds with bauxite increases as a result glass phase generated and lead to decreasing the porosity and increasing the shrinkage, density and mechanical properties compared with micro-SiC additives.

Improvement the Chemical Resistance of Furnaces Bricks for Petroleum Refineries by ZrO2-Nano- Glass-Ceramic Coated

S.A. Zaidan; H. Y. Abed

Engineering and Technology Journal, 2017, Volume 35, Issue 10, Pages 999-1002

Partial Stabilized Zirconia (PSZ) was prepared from adding 3 wt % of MgO or adding 8 wt% of Y2O3 to 90 wt % ZrO2 Powder and mixed by wet method, then dried and firing mixture to 1500C to obtain PSZ ceramic powder. Glass-Ceramic (Li2SiO3) and (LiAlO2) prepared by dissolve lithium carbonate and lithium hydroxide with Nano-Silica (SiO2) and Nano-Alumina (Al2O3) respectively. Those glass-ceramic mixed with PSZ in different percentage (2.5,5,7.5,10) and sprayed on furnaces bricks for petroleum refineries. An increase in the chemical resistance of the acid on the surface of the Refractory bricks was observed when coating with the glass-ceramic mixture, as well as increasing the hardness and thermal shock resistance. Lithium silicate coated specimens are more spared and homogeneous on the surface compared to lithium laminate coated.

The Effect of Pure Aluminum Weight Percent on Different Properties of a New Cermet Material Made of Al-Machinable Glass Ceramic

a Abdul-Hassan Khalaf; Bayda

Engineering and Technology Journal, 2011, Volume 29, Issue 4, Pages 805-813

In this research high pure aluminum metal with the following weight percent
(1,2,3,4,5) has been added to machinable glass-ceramic, after the preparation of the
samples by pressing then firing the effect of this addition on the density, hardness,
young modulus, and polishing and grinding time of the machinable glass-ceramic
have been studied. It has been found that the increasing in aluminum percent lead to
slightly increase in density while the hardness, young modulus, and polishing and
grinding time decreased.