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ABSTRACT The effect of calcium hexaaluminate and boric acid doping on commercially available dental powder was investigated. The ceramic samples were produced using the dental powder and dopants to detect the improvements in durability of... more
ABSTRACT The effect of calcium hexaaluminate and boric acid doping on commercially available dental powder was investigated. The ceramic samples were produced using the dental powder and dopants to detect the improvements in durability of ceramic teeth. The samples were prepared homogenously prior to sintering to avoid the porosity in the ceramic. Three different test groups were sintered to determine the effect doping with different proportions of boric acid (BA), calcium hexaaluminate (CHA) and both (BA+CHA). The characterizations of the sintered products in different temperatures were conducted by firing shrinkage, micro hardness, thermal shock, colorimetric and SEM tests. Moreover, water adsorption and three point flexure tests were performed on the samples. The experimental results were evaluated with regard to durability and whitening of the ceramic teeth. The optimum proportions of boric acid (2%) and calcium hexaaluminate (3%) were determined with sintering temperatures between 700 and 950°C.
The primary objective of this research is the fabrication of boron end products from boron derivatives by electro-deposition as powder or coating. The production of boron carbonitride is achieved by electro-deposition at low temperatures... more
The primary objective of this research is the fabrication of boron end products from boron derivatives by electro-deposition as powder or coating. The production of boron carbonitride is achieved by electro-deposition at low temperatures without carbon dioxide emission, regardless of sintering and thermal treatment. The extensive usage of boron is aimed and should be accomplished by application of electro-deposition method for boron carbonitride fabrication.
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In this paper, the influence of coal bottom ash and tincal additions on the physical properties and microstructures of the standard wall tile body composition was investigated. Water absorption, fang strength, dry and fired shrinkage... more
In this paper, the influence of coal bottom ash and tincal additions on the physical properties and microstructures of the standard wall tile body composition was investigated. Water absorption, fang strength, dry and fired shrinkage tests of the incorporated ceramic bodies and reference body were done. Microstructures of sintered tiles were analyzed using a scanning electron microscope (SEM). The results show that tincal additions to the ceramic body improved the physical properties of the tiles. As a result, tincal can be used as a flux material in the ceramic bodies due to its favorable effects on the water absorption and fired strength. The results revealed that bottom ash can be used in the ceramic tile body composition. When bottom ash was used in the ceramic industry, environmental hazards of bottom ash are inhibited. Furthermore, bottom ash is transformed to an economic product
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ABSTRACT
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Üretim aşamasında açığa çıkan 50000 t civarındaki ortalam 63 mikron boyuta sahip elektrofiltre magnezit tozu Kümaş A.Ş. firmasının en önemli sorunlarından biridir. farklı metodlarla yüksek saflıkta sentetik sinter magnezya üretimi birçok... more
Üretim aşamasında açığa çıkan 50000 t civarındaki ortalam 63 mikron boyuta sahip elektrofiltre magnezit tozu Kümaş A.Ş. firmasının en önemli sorunlarından biridir. farklı metodlarla yüksek saflıkta sentetik sinter magnezya üretimi birçok ülkede yapılmasına rağmen Türkiye'de henüz ticari boyutta üretimi yapılmamaktadır. Bu çalışmanın amacı, Kümaş magnezit atıklarını değerlendirerek firma ve ülke ekonomisine katkı sağlamak ve ince boyutta stoklanması zor olan atık malzemenin rüzgar ve sel gibi etkenlerle çevreye zarar vermesine engel olmaktır. Deneysel çalışmalar sırasıyla, numunenin kimyasal ve mineralojik özelliklerini tespiti, liç işlemi, biriketleme ve sinterleme işlemlerinden oluşmaktadır. Tekrar edilen deneylerde %0.23 SiO2, %0.71 CaO, %0 Fe2O3, %0 Al2O3 ve 599.01 MgO içeren temiz ürünler elde edilmiştir. Elde edilen sonuçlar cesaret verici olarak değerlendirilmiştir.
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This study investigates the production of high-quality MgCl2 from recycled waste magnesite powder with an average particle size of d(50) 0.079 mm using the HCl acid leaching method. The experimental parameters were, leaching temperature,... more
This study investigates the production of high-quality MgCl2 from recycled waste magnesite powder with an average particle size of d(50) 0.079 mm using the HCl acid leaching method. The experimental parameters were, leaching temperature, leaching time, amount of the acid, liquid-to-solid ratio, scale-up factor, acid concentration, particle size and mixing speed. The experiments were performed under reproducible conditions. The results showed that optimum leaching parameters were: temperature of 70 degrees C, 180 min leaching time, 130 cm(3) acid consumption, 3.6 cm(3)/g liquid-to-solid ratio, scale-up factor of 1, 10.17 M acid concentration, 0.079 mm average particle size and a mixing speed 60 rpm. Under these optimum conditions, the leaching yield was 96.72%. The produced MgCl2 solution contained 0.04% SiO2, 0.36% CaO, 0% Fe2O3, 0% Al2O3, 46.73% MgCl2, 52.87% L.O.I. and 99.60% MgCl2+L.O.I. (= MgCl2 center dot 6H(2)O). These results indicated that high-quality magnesium chloride can...
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During production stage, nearly 50000 tonnes accumulated electro-filter magnesite dust which is under 63 microns, is the most fundamental problem for Kumas Establisment. Although the high purity of MgCl2 produced in many countries by... more
During production stage, nearly 50000 tonnes accumulated electro-filter magnesite dust which is under 63 microns, is the most fundamental problem for Kumas Establisment. Although the high purity of MgCl2 produced in many countries by means of different methods, there is no any commercial production in Turkey. The aim of this study is to beneficiate magnesite dust, which is hard to storage as fine, and also to prevent the harmful eeffects to environment, furthermore, to contribute additional income to company budget by production of MgCl2 compound. The procedures of experimental studies were initially to define the chemical and mineralogical properties of mineral and then carry out the leaching process, respectively. Through the experimental studies the effect of amount of acid, of optimal leaching temperature and dwelling time on dissolution recovery were studied. Accordinglu, 3 h leaching time, 70 oC leaching temperature, 50 g example against 130 mL HCl and 60 rpm were defined as o...
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In the present study, the influence of boron derivates such as calcined tincal concentrate (CTC), boric acid (BA) and borax pentahydrate (BPH) on the physical properties and microstructure of the standard floor tile body composition was... more
In the present study, the influence of boron derivates such as calcined tincal concentrate (CTC), boric acid (BA) and borax pentahydrate (BPH) on the physical properties and microstructure of the standard floor tile body composition was investigated. Fired strength, water absorption, and shrinkage tests on the incorporated ceramic bodies and Reference Body (RB) were carried out. Microstructures of sintered floor tiles were examined by a scanning electron microscope (SEM). The results reveal that boron additives to the ceramic body enhanced the physical properties of the tiles. Consequently, boron derivates can be used as a flux material in ceramic bodies as a result of its constructive effects on the water absorption and fired strength. When compared to each other, it was found that BPH was the convenient component in the ceramic tile body composition.
Research Interests: Materials Engineering, Chemical Engineering, Condensed Matter Physics, Materials Science, Pyrolysis, and 11 moreNano, Photocatalysis, Magnesium, Sol Gel Process, Oxide, Scanning Electron Microscope, Fourier transform infrared spectroscopy, Sol gel, Spray Pyrolysis, Magnesium Oxide, and Flame Spray Pyrolysis
Oksit nanomalzemeler gelismis yapisal seramiklerin hazirlanmasi icin katalizor ve baslangic malzemeleri dahil olmak uzere genis bir uygulama alanina sahiptir. MgO kimyasal olarak inert, elektrik yalitimi, optik seffaflik, yuksek sicaklik... more
Oksit nanomalzemeler gelismis yapisal seramiklerin hazirlanmasi icin katalizor ve baslangic malzemeleri dahil olmak uzere genis bir uygulama alanina sahiptir. MgO kimyasal olarak inert, elektrik yalitimi, optik seffaflik, yuksek sicaklik kararliligi, yuksek termal iletkenlik ve ikincil elektron emisyonu gibi mukemmel ozelliklere sahip olmakla birlikte NaCl kristal yapisi ile son derece yalitkan kristalin malzemedir. Bu calismada, katalizor malzeme olarak grafen uretiminde kullanilmak uzere nanoboyutlu MgO tozu alev sprey piroliz (ASP) teknigi ile sentezlenmistir. Uretilen tozlara havada 120 dakika 500oC’de kristalin yapisini elde etmek icin tavlama yapilmistir. Faz yapisi x-isinlari difraktometresi (XRD) ile birincil partikullerin morfolojisi ve boyutu taramali elektron mikroskobunda (SEM) ile incelenmistir. Partikul buyuklugu, partikul boyutu analizi (PSA) kullanilarak belirlenmistir. Analiz sonucunda, partikullerin ortalama boyutu 60 nm ve MgO (periklas) faz yapisinda oldugu saptanmistir
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In this study the use of hydratable alumina binder (Alcoa) instead of Calcium Aluminate (CA) cement as binder in the production of SiC based self-flowing castable has been investigated. Spent SiC particles were classified into different... more
In this study the use of hydratable alumina binder (Alcoa) instead of Calcium Aluminate (CA) cement as binder in the production of SiC based self-flowing castable has been investigated. Spent SiC particles were classified into different fractions following crushing and grinding operations and have been utilized as aggregate. Tabular alumina, calcined monodipersed alumina, and hydratable alumina/CA cement were used as binder matrix. Anorthite (CaO.Al2O3.2SiO2) a gehlenithe (2CaO.Al2O3.2SiO2) phases were formed according to the CaO-Al2O3-SiO2 three phase diagram. Molten phase negatively affects refractoriness of the materials. For that reason, by using hydratable alumina instead of CA cement mullite binder was created. Mullite was studied by SEM. In addition to CA cement supplementary samples, molten phase produced with CaO lessened the value of the hot modulus of rupture (HMOR). Hydratable alumina binder added samples at 1450 o C, however amplified the values of HMOR. It was concluded that the refractories acquired can be used as kiln furniture for porcelain sector.
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Variation in prices continuously makes it hard to estimate the prices for the engineers involved in project preparation. A method of providing beginning price estimation is to examine a similar fulfilled project cost. As the cost values... more
Variation in prices continuously makes it hard to estimate the prices for the engineers involved in project preparation. A method of providing beginning price estimation is to examine a similar fulfilled project cost. As the cost values refer to earlier period years, these values ought to be updated. A cost index is the most appropriate method to revise the cost values referring to the previous years. Thus, the ratio of varying cost and income that is required to investment analysis could be practically estimated. Common price indexes have been published by the chamber of the commerce and authorized statistical institutions in every country. Besides there are many particular sectoral indexes formed and published in the international journals. In Turkey, this sort of sectoral cost indexes haven’t been published yet. Wholesale Price Index (TEFE) is the most common index used in the feasibility studies published by the State Institute of Statistics (DİE) and some Chambers of Commerce. Development and use of a special index that cover the sectoral structure will support the estimations more meaningful. In this study, the production cost index for ceramic clay which is an important raw material for the ceramic sector has been calculated. The Laspeyres formula has been used for the index calculations. This index for year of 1990 was assigned as 100. Obtained index values have been compared with TEFE indexes. The graphics revealed that the price index for each mine have shown differences from TEFE. Special price indexes should be published for each sector and also subsectors due to these differences.
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ABSTRACT
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... N. Erdoğan, M. Kaya, T. Batar & B. Kahraman ... magnezya üretilmiştir Bu da çalışmadan beklenen sonuçların alınması anlamına gelmektedir KAYNAKLAR Atak, S, 1982, "Flotasyon ilkeleri ve Uygulamaları", IT U , Maden... more
... N. Erdoğan, M. Kaya, T. Batar & B. Kahraman ... magnezya üretilmiştir Bu da çalışmadan beklenen sonuçların alınması anlamına gelmektedir KAYNAKLAR Atak, S, 1982, "Flotasyon ilkeleri ve Uygulamaları", IT U , Maden Fakültesi yayını, istanbul Breusch, FL ve Ulusoy, E , 1987 ...
Özet Bu çalýþmada, katký malzemesi olarak %0-5 perlit, %0-2,5 atýk kâðýt, %0-5 kalsine tinkal (boraks) ve %3,5- 17,7 atýk kalsine tinkal kullanýlarak sýva malzemesi üretilmiþtir. Optimal karýþým oranlarý %3 perlit, %1,5 atýk kâðýt, %7,1... more
Özet Bu çalýþmada, katký malzemesi olarak %0-5 perlit, %0-2,5 atýk kâðýt, %0-5 kalsine tinkal (boraks) ve %3,5- 17,7 atýk kalsine tinkal kullanýlarak sýva malzemesi üretilmiþtir. Optimal karýþým oranlarý %3 perlit, %1,5 atýk kâðýt, %7,1 atýk kalsine tinkal olarak bulunmuþtur. Üretilen malzemelerin mukavemet ve ýsý geçirgenlik direnç deneyleri TS 825 ve TS 12808-3 standartlarýna göre yapýlmýþ ve mevcut sýva malzemeleri ile karþýlaþtýrýlmýþtýr. En iyi sonuçlarý veren karýþým oranýnda üretilen malzemenin ýsý iletkenlik deðeri 0,17 W/m2K ve mukavemet deðeri 61,44 kg/cm2'dir. Buna karþýlýk bu deðerler sýrasýyla TSE 825'te 0,13 W/m2K ve 24 kg/cm2'dir. Katkýlý ürün, kontrol grubu (piyasadaki sýva malzemesi) ile karþýlaþtýrýldýðýnda ise ýsý geçirgenlik direnci %26, mukavemet deðeri %31 oranýnda artmýþtýr. Bu çalýþma ile çevre dostu yeni sýva malzemesi geliþtirilmiþtir. Anahtar Kelimeler: Atýk kâðýt, kalsine tinkal, perlit, sýva. Production and Characterization of Wall Plaster...