Dissertation > Excellent graduate degree dissertation topics show

Investigation in Chrome-free Refractories for Secondary Refining

Author: ChengZhi
Tutor: MaWeiBing；LiuJun
School: Tianjin University
Course: Materials Engineering
Keywords: Low carbon magnesia-carbon material Performance Microstructure Slag corrosion Thermal shock resistance
CLC: TQ175.1
Type: Master's thesis
Year: 2008
Downloads: 51
Quote: 2
Read: Download Dissertation

Abstract


The composition and structure of the low-carbon MgO-C refractories and the factors affect the properties of the low-carbon MgO-C refractories were discussed as well as the development and problems of the low-carbon MgO-C refractories. The effects of the components on properties in room temperature and high temperature of the low-carbon MgO-C refractories were studied systemically and the slag corrosion resistance of the material was also analyzed. The conclusions were described as follows.(1) As the graphite content increasing, the cold crushing strength, cold modulus of rupture and bulk density of the low-carbon MgO-C refractories are decreased. Meanwhile, The apparent porosity of the specimens with 5% addition of graphite is higher than that of specimens with 3% addition of graphite. The apparent porosity is increased obviously no matter to the unfired or to the fired specimens when graphite content is higher than 5%, which will bring the slag resistance of low-carbon MgO-C refractories down sharply.(2) The oxidation resistance of low carbon MgO-C materials can be increased by adding aluminum powder. However, excessive aluminum powder would lead to pulverization and expanding. So 3% addition of aluminum powder in low carbon MgO-C materials is suitable. Furthermore, the oxidation resistance of low carbon MgO-C materials can be increased by adding magnesium aluminum alloy powder also, which is better than that of adding into the same quantity of aluminum powder. The low carbon MgO-C materials perform the best oxidation resistance with the 0.5% addition of magnesium aluminum alloy powder in mixing adding.(3) The apparent porosity of the specimens fired in air and buried with charcoal is increased and the bulk density of the specimens is decreased with the more addition of MgO-C. When addition of MgO-C exceedes 3%, the apparent porosity is higher rapidly and the bulk density is lower sharply. The suitable addition of MgO-C is 3%.(4) The thermal shock resistance about low carbon MgO-C materials can be increased by changing the addition and adding way of carbon Microsphere, superfine graphite and binder of Carbores.

Related Dissertations

  1. Empirical Study on the Top Management Turnover and Performance of Listed Companies in China,F224
  2. Study on Properties of Thermal Shock and Ablation Resistance for Gr/Al-Mg Composites,TB332
  3. Reactive Hot-Pressing and Mechanical Properties of （ZrB2-ZrO2）/BN Composites,TB332
  4. Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys,TG146.22
  5. Investigation on Microstructure and Properties of Cadmium-Free Silver-Based Intermediate Temperature Filler Metals,TG425.2
  6. Research on Technology and Mechanism of Joining Cemented Carbide to Carbon Steel,TG454
  7. Powered Activited Carbon-UF for Treating Micro-polluted Surface Water,X703
  8. The Brake Performance of Hydraulic Retarder and Simualtion Research on Its Application for Aircraft Arrestment,TH137.331
  9. Numerical Study of the Effect with Straight and Bowed Stator in Different Axial Gaps,TH45
  10. Effectiveness Evaluation on the Jointed Combat of the Multiple Missiles and Research on Combinatorial Optimization Algorithm,TJ760.1
  11. The Research of Steel’s Representation in Architecture,TU-0
  12. Partical Combination of Fine Powder Effect on Performance of Cement and Concrete,TU528.041
  13. Experimental Research on the Influence of Hollow Cathode to a Hall Thruster,V439.2
  14. Preparation and Properties of Silicon Carbon Anode for Lithium Ion Battery,TM912.9
  15. Hardware Implementation of LEO Satellite Channel Characteristic Emulation,TN927.23
  16. Development of Pxibus High Performance Digital I/O Module,TP274
  17. The Research on the Performance Results Application of Zhaoqing Power Supply Bureau,F272.92
  18. The Preparation and Properties of Reed Woodceramic,TQ174.1
  19. Improve the Junior High School Students Interested in Learning Chemistry Research,G633.8
  20. Synthesis and Resolution Property of N-(9-Fluorenylmethoxycarbonyl)-D-Tryptophan and D-Phenylalanine Imprinted Polymer,O631.3
  21. The Investigations on the Characteristics and Mechanism of NIR Emission from Bi-doped Silicophosphate Glasses,TQ171.1

CLC: > Industrial Technology > Chemical Industry > Silicate > The refractory industry > Basic theory
© 2012 www.DissertationTopic.Net  Mobile