Investigation of anti-weather (super hydrophobic surface)‎ by cold spray process

Dissertant

Muhammad, Shadha Kazim

Thesis advisor

Hamzah, Muhammad Sallab
Abd al-Hamid, Ala Ala al-Din

University

University of Technology

Faculty

-

Department

Department of Materials Engineering

University Country

Iraq

Degree

Master

Degree Date

2013

English Abstract

In this project composed films was prepared from powders of titanium dioxide TiO2 and vanadium oxide V2O5 by cold spraying technique, using air compressed at room temperature on substrates preheated to 100 Cᵒ of glass and st.

st.

316L.

Five mixing ratios (0, 25, 50, 75 and 100) % were prepared with different deposition angles (0ᵒ, 15ᵒ, 30ᵒ and 45ᵒ), in order to prepare thin film high rejection for water (super hydrophobic surface).

Prepared thin films have been examined by X-ray diffraction technique, scanning electron microscope, atomic force microscope , examination of optical transmittance, roughness , wear and the contact angle of these films.

The effect of weathering (Iraqi weather conditions) on the best ratio result of these films and influential had been studied.

The results show that pure titanium dioxide films have a structure of tetragonal while vanadium oxide has orthorhombic structure.

The images of scanning electron microscope show that the titanium dioxide is smooth and has homogeneous cluster groupings shape.

While vanadium oxide films gatherings sheets have irregular dimensions and size.

The mixing ratios of (50%TiO2, 50%V2O5) are homogenous and coherent.

Optical transmittance test results show that the highest optical transmittance is 83% at the condition of pure titanium dioxide and increase with increasing vanadium oxide deposition ratio where reached 93%.

This allows to applications on the lenses and other applications that require high transmittance.

Measurement of roughness and wear shows fluctuations in the values of these measurements with the changing mixing ratios, reaching the highest rate of wear in the case of pure vanadium oxide while the lowest rate of wear at the state of pure titanium dioxide.

While the highest value of roughness is at the condition of 50% titanium oxide and 50% vanadium oxide.

Test results of contact angle shows that the films are hydrophobic at a few angle deposition and with increasing vanadium oxide deposition ratio, and become super hydrophobic for all ratios at higher deposition angle value and reach their highest values at a rate of 50% for each of the materials and angle deposition 45˚ reaching 160 ᵒ.

The effect of weather conditions on the optical transmittance for the best films is 50% for each of the materials that optical transmittance has been reduced by 5% at 0 ᵒ angle and only 1% at an angle 45 º after 6 months of exposure.

Annealing temperature was 300 ˚C.Thicknesses of the film was 0.37 um.

Main Subjects

Engineering & Technology Sciences (Multidisciplinary)

Topics

• Solids

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-418430