Dissertation > Excellent graduate degree dissertation topics show

Preparation and Performance Testing of Composite Materials Based on SiO2 for Consolidation of Stone Heritages

Author: SunMin
Tutor: LiuShaoJun
School: Harbin Institute of Technology
Course: Materials Science and Engineering
Keywords: stone heritages sol-gel method consolidants comprehensive performance
CLC: TB33
Type: Master's thesis
Year: 2011
Downloads: 60
Quote: 0
Read: Download Dissertation

Abstract


There are four representative grottoes in China and they possess greatly history values, art values and science values. However, as stone monuments located outdoors, they are always exposing themselves to natural environment and are suffering from natural factors and human factors so that weathering phenomenon of them becomes more and more serious day by day. Stone heritages are precious cultural resources and unrenewable resources in order that many countries are trying their best to research excellent materials to protect them.However, the stone heritages have their own special characters so that the protective materials must have excellent properties. At present, nanocomposite materials are exensively paid more attentions to because of their excellent performances. In the experiment, sol-gel method was used to prepare organic/inorganic composite materials which can consolidate weathered stone heritages.The experiment demonstrates that these concentrations of reactants including water , TEOS, ETOH and ammonia have direct influences on the stability of sol. Stirring velocity and dropping rate also affect that. Water concentration and surfactant affect seperately the size of nanoparticle and their dispersion.Methyltrimethoxysilane have excellent performances which had alidated by my partner so the material was chosen to prepare composite materials. When its weight perceng is 15, the sol has high consolidation uptake, low viscosity, short gel time and better stability. Wacker OH100 and KSE OH300 which are commercial consolidate materials are chosen as contrasts. SEM images show that there are many cracks on the surface of Wacker OH100 and KSE OH300 gel after laying for 10 days.As consolidate materials to protect weathered gritstone stone heritages, penetrability and consolidation strength are the main standards to value its properties. However, other properties must also be assured. The tests done on stone samples show that color variation caused by the composite material is small and it is limited to related standards; the composite material has low viscosity which is near to that of water; the consolidant uptake of the composite material is much better than pure organic materials; its breathability is higher than commercial consolidants; its acid-resistance and alkaline-resistance are better than other materials and especially its salt tolerance is very distinct; the composite materials can effectively decrease water absorption and surface absorption and increase hydrophobic, the aging resistance improves highly. The results above show that the composite materials prepared in the experiment have excellent comprehensive performance.

Related Dissertations

  1. Study on the Synthesis Bi3.25La0.75Ti3O12（BLT） Nanotubes and Nano Wires,TB383.1
  2. Cobalt Ferrite and Its Performance,O611.4
  3. Synthesis and Characterization of Low-dimensional Nickel Borate/ Lanthanum Borate Nano Materials,TB383.1
  4. The Research on Preparation Technology and Sintering Behavior of Rare Earth Aluminates (Dy3Al5O12、 NdAlO3、LaAl11O18),TB383.3
  5. Studies of High Refractive Index Materials Prepared by Nano ZrO2 and TiO2 Hybrid Silicone Epoxy Resin,TB383.1
  6. Preparation and Characterization of Al2O3/C Hybrid Aerogels and Al2O3 Aerogels,O648.17
  7. Study on the Photoelectrocatalytic Degradation of Nitrogen-containing Organic Pollutants with ZnO Thin-films Prepared by Sol-gel Method,X703
  8. The Study on Properties of Desulfurization and Denitrification by Mn/Al Catalysts,X773
  9. Investigation into ZnO Thin Film Transistors Prepared by Sol-gel Method,TN321.5
  10. Research about Synthesis and Application of Magnesium Borate and Aluminum Borate Nanowiskers,TB383.1
  11. Research on Modifying of Wood Surface Properties by Silicon Dioxide,TS652
  12. Nanotube modified carbon fiber reinforced composite material structure of the capacitor,TB33
  13. Sol - gel method p -type ZnO films,O484.1
  14. Storage-stable organic / inorganic hybrid polymers and their light-cured coating application,TQ630.4
  15. The Effective Coordinationof Fiscal Policy and Monetary Policy,F812.0;F224
  16. Modification of Magnetic Nano-materials and the Application in Chromium Speciation,X830
  17. The Experimental Research on the Degradation of Indoor Formaldehyde by Nano- TiO2 Combined Coating,X13
  18. W-type hexagonal ferrite preparation and absorbing properties of,TM277
  19. Cone octahedral Fe 3 O 4 and hexagonal platelets Ba (Me) x Co 2-2x Fe 16 O 27 microwave absorption properties,TM25
  20. Catalytic Behaviors for Isobutene Selective Oxidation of MoVBi-AlPO4 Catalysts,O643.32
  21. Optimization in the Design and Key Technology Research on Impact Roller,U415.521

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials
© 2012 www.DissertationTopic.Net  Mobile