Otomotiv endüstrisinde kullanılan Al2O3/SiC partikül destekli metal matriks kompozit üretimi ve mekanik davranışlarının incelenmesi
The Fabrication of Al2O3/SiC particle reinforced metal matrix composites used in automotive, industry and investigation of their mechanical behaviours
- Tez No: 129140
- Danışmanlar: PROF.DR. İBRAHİM ÖZSERT
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Vorteks, Partikül Destek, MMK, Aşınma Direnci, Çekme Mukavemeti, Eğilme Mukavemeti, Yüzey Pürüzlülüğü, Sertlik. Metal matriksli (ana yapılı) kompozitler (MMK) metallerin süneklik ve tokluğunu
- Yıl: 2002
- Dil: Türkçe
- Üniversite: Sakarya Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Makine Eğitimi Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 159
Özet
ÖZET
Özet (Çeviri)
THE FABRICATION OF Al3O3/SiC PARTICLE REINFORCED METAL MATRIX COMPOSITES USED IN AUTOMOTIVE, INDUSTRY AND INVESTIGATION OF THEIR MECHANICAL BEHAVIOURS SUMMARY KEYWORDS: Stir Casting, MMC, Particle Reinforcement, Wear Resistance, Bending Strength, Tensile Strength, Hardness, and Machining. Nowadays, composite materials gain importance. Single way materials are no longer desired. Therefore, most of the researches on the materials are dealt with improving composite properties. The main branches of composites are polymers metal and ceramic matrix. While polymer matrix composite are suitable for low temperature applications, ceramic matrix composites are used for high temperature applications. However, with CMCs, a reliable level of fracture toughness is not yet obtained. Therefore metal matrix composites (MMC) are main alternatives to conventional materials. Metal matrix composites are attractive since they have high yield strength, high modulus, high compressive strength, high wear resistance, creep, low thermal expansion coefficient and high temperature strength. The aim of this study is to produce alumina/SiC powder mix to reinforce A332 alloy by using stir-casting method and to investigate mechanical properties of resulting composite. In order to prepare ceramic preforms chemical process was used rather than using mixing of ceramic powders to obtain porous AI2O3/SİC ceramic foam. A slurry was prepared by mixing aluminium sulphate Al2(SO4)3.xH20 (x=14-16) and ammonium sulphate (NH4)2SO4, in the water, and silicon carbide powder was added into the slurry so that homogeneous mixture of Al2O3 / SiC could be produced after final reaction. The resulting product was (NH4)2S04Al2(S04)324H20 plus SiCp after dissolving chemicals in the water. This product was heated up in a ceramic crucible in the furnace. With the effect of heat it became foaming and AI2O3/SİC cake was obtained. Resulting A1203 grains were on the SiC particles proved by SEM examination. Consequently, homogeneous powder mix and porosity were provided in the cake. This powder mix was milled and stirred with liquid Al-Si alloys to produce MMCs. It has been observed that composites produced by means of stir casting do not contains macro porosity and reinforcement particles are randomly distributed within the Al matrix. Optical and SEM examination of fabricated Metal Matrix Composites show that ceramic particles are uniformly distributed, but the particles tend to accumulate inter dendrites. In tensile strength, bending strength and hardness tests maximum values were obtained for 2 \mm particle reinforced composites, on the other hand maximum wear resistance was obtained for 53 um particle reinforced composites. XV
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