Effect of Alumina concentration on mechanical propertiesm of glasses?
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The addition of alumina (Al2O3) to glasses has been found to have a significant effect on their mechanical properties. Increasing the alumina content leads to an increase in the glass transition temperature and elastic moduli, resulting in improved mechanical strength . The presence of alumina also contributes to the precipitation and transition of certain crystalline phases, such as β-quartz solid solution, which can result in smaller grain sizes and higher visible transmittance in glass-ceramics . Additionally, the incorporation of alumina in bioactive glasses has been shown to enhance their compressive strength and reduce porosity, leading to improved mechanical performance . The specific effects of alumina concentration on mechanical properties may vary depending on the composition and processing conditions of the glasses being studied .
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2 Citations | The provided paper does not mention the effect of alumina concentration on the mechanical properties of glasses. The paper focuses on the effect of different amounts of Al on the mechanical properties and glass-forming ability of a Cu-Zr-Al alloy. |
19 Dec 2016 5 Citations | The paper discusses the effect of alumina addition on the mechanical properties of bioactive glass. It shows that the addition of 2 wt% alumina leads to the highest compressive strength in the glass. |
11 Citations | The provided paper does not discuss the effect of alumina concentration on the mechanical properties of glasses. |
| The paper discusses the effect of alumina content on the mechanical properties of calcium aluminosilicate glasses, including the increase in glass transition temperature and elastic moduli with increasing alumina concentration. |
Related Questions
How to produce alumina?4 answersAlumina can be produced through various methods. One method involves digesting aluminium-bearing materials with hydrochloric acid to produce an aluminium chloride liquor and acid-insoluble solids. The solids are then separated from the liquor, and the liquor is depleted of impurities. Aluminium chloride hexahydrate solids are produced from the liquor, which are then thermally decomposed to produce high purity alumina. Another method involves carbothermal reduction of a solid material prepared from an aluminum mineral-containing acid-soluble substance to obtain a crude alumina product. This product is then subjected to alkali dissolution, seed precipitation, and calcination to produce alumina. Additionally, sintering an aluminum compound in the presence of a molybdenum compound and a potassium compound, where the aluminum compound includes aluminum hydroxide, can also be used to produce alumina. Another method involves treating aluminous material, calcining it, leaching it with hydrochloric acid, and then crystallizing and precipitating aluminum chloride hexahydrate to obtain alumina. Finally, alumina can be prepared by placing aluminum sulfate in a reactor, introducing gas, and heating it to a set temperature for a certain time.
What is the density of alumina?4 answersThe density of alumina varies depending on the specific context. In the study by Zhou et al., the density of liquid alumina was found to be 2.81 g/cm3 and 3.17 g/cm3 at different temperatures and densities. In another study by Kalinina et al., high-density ceramics were prepared with a density of 3.93 g/cm3. Wang et al. developed a method to establish alumina density balance, with the alumina density kept around 2.6% on average. Glorieux et al. determined the density of liquid alumina drops to be represented by the expression d=(2.79±0.01)(l−α(T−2500)) g·cm−3. Finally, Kondou and Yokota produced high-density alumina with a relative density of ≥99.5%. Therefore, the density of alumina can range from 2.81 g/cm3 to 3.93 g/cm3, depending on the specific context.
What is the properties of alumina ceramic?4 answersAlumina ceramics have several properties that make them suitable for various applications. They have high hardness, strength, wear resistance, and chemical and thermal stability. The addition of yttria-stabilized zirconia (3YSZ) to alumina can enhance its mechanical properties, such as fracture toughness and hardness. The microstructural features, such as the presence of elongated grains, play a role in determining these properties. The use of techniques like plasma pressure compaction (P2C) sintering and laser polishing can further improve the compaction, surface roughness, and surface properties of alumina ceramics. Overall, alumina ceramics are known for their exceptional properties, making them suitable for wear-resistant components, machine parts, and other applications that require high hardness, strength, and chemical stability.
What are the mechanical properties of alumina?3 answersAlumina, a type of aluminum oxide, has various mechanical properties. The characteristic strength of transparent alumina densified by hot-pressing platelet-morphology powder is around 179-207 MPa, depending on the starting orientation of the platelets. Polycrystalline alumina's mechanical characteristics, such as compressive strength and fatigue intensity, are influenced by grain size and porosity distribution. Nanocrystalline ceramics, like alumina, can be toughened by embedding different nano-scale materials, such as zirconia, to increase fracture toughness. Alumina matrix composites, fabricated by hot-pressing with additives like zirconia and alumina platelets, show improved bending strength and fracture toughness compared to monolithic alumina. Porous alumina ceramics, fabricated using a cold sintering process, exhibit varying mechanical strength and hardness depending on the annealing temperature.
What factors affect the wear resistance of alumina?3 answersThe wear resistance of alumina is influenced by several factors. The addition of metallic Ni or NiAl2O4 particles to alumina composites results in a significant increase in wear resistance, which is correlated to the reduced grain size. Rare earth oxides, such as Yb2O3, can improve the wear resistance of alumina ceramics, while Tm2O3 has the opposite effect. The wear resistance of spark plasma sintered Al2O3 matrix composites with additions of NbC increases with the NbC content. Nb2O5 single-doping can increase the density of alumina effectively, but excessive Nb2O5 can lead to abnormal grain growth. On the other hand, MgO/Nb2O5 co-doping can further increase the density and suppress abnormal grain growth, resulting in lower wear rates. The alumina content also plays a role, with higher alumina content showing better wear resistance under impact-abrasive load conditions.
What is alumina oxide?5 answersAlumina oxide (Al2O3) is a ceramic material that is widely used for various applications. It is known for its compressive strength, hardness, and high inertness, making it suitable for use in optoelectronics, corrosion resistance, and as a support for catalytically active phases. Alumina oxide can exist in different phases, such as α-corundum, orthorhombic Rh2O3(II), and post-perovskite, depending on the pressure and temperature conditions. Laser-driven shock compression experiments have been conducted to study the phase transformations of alumina oxide under extreme conditions. The material has also been investigated for its potential use as a radiation dosimeter, with thin coatings of Al2O3 showing promise as nano-dosimeters for applications in nonproliferation, retrospective dosimetry, and nondestructive inspection. In the biomedical field, alumina oxide is used for implant manufacturing due to its high biocompatibility and mechanical characteristics, such as high compressive strength.