Calcined kaolin/TiO2 composite particle material(CK/TCPM)was prepared with TiO2 coating on the surfaces of calcined kaolin particles by the mechano-chemical method.X-ray diffraction(XRD)and scanning electron microscop...Calcined kaolin/TiO2 composite particle material(CK/TCPM)was prepared with TiO2 coating on the surfaces of calcined kaolin particles by the mechano-chemical method.X-ray diffraction(XRD)and scanning electron microscope(SEM)were used to investigate the microstructures and morphologies,respectively.The mechanism of the mechano-chemical reaction between calcined kaolin and TiO2 was studied by infrared spectra(IR).The results show that TiO2 coats evenly on the surfaces of calcined kaolin particles by Si-O-Ti and Al-O-Ti bonds on their interfaces.The hiding power and whiteness of CK/TCPM are 17.12 g/m^2 and 95.7%,respectively,presenting its similarity to TiO2 in pigment properties.展开更多
ZrO2/TiO2 composite photocatalytic film was produced on the pure titanium substrate using in-situ Zr(OH)4 colloidal particle by the micro-arc oxidation technique and characterized by scanning electron microscope (...ZrO2/TiO2 composite photocatalytic film was produced on the pure titanium substrate using in-situ Zr(OH)4 colloidal particle by the micro-arc oxidation technique and characterized by scanning electron microscope (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD) and ultraviolet-visible (UV-Vis) spectrophotometer. The composite film shows a lamellar and porous structure which consists of anatase, futile and ZrO2 phases. The optical absorption edge of film is shifted to longer wavelength when ZrO2 is introduced to TiO2. Furthermore, the photocatalytic reaction rate constants of degradation of rhodamine B solution with ZrO2/TiO2 composite film and pure TiO2 film under ultraviolet irradiation are measured as 0.0442 and 0.0186 h 1, respectively.展开更多
The present study confers to the fabrication and its characterization of magnesium alloy(AZ91E)based nano composites with nano Al2O3particulate reinforcements.A novel Semi Solid stir casting technique was adopte...The present study confers to the fabrication and its characterization of magnesium alloy(AZ91E)based nano composites with nano Al2O3particulate reinforcements.A novel Semi Solid stir casting technique was adopted for the fabrication of the composite.An average particle size of 50 nm was used as reinforcement to disperse in matrix.The effects of change in weight fraction of reinforcements on the distribution of particles,particle–matrix interfacial reactions,physical as well as mechanical properties were reported.The SEM and EDS analysis has shown the uniform distribution of particles in the composite along with the presence of elements.The mechanical properties of reinforced and unreinforced composite were evaluated and presented.Fractography of tensile specimens was also discussed.展开更多
Barite/TiO2 composite particle(B/TCP)was prepared by coating TiO2 on the surfaces of barite particles through mechano-chemical method.The preparation parameters and pigment properties of B/TCP as well as the interacti...Barite/TiO2 composite particle(B/TCP)was prepared by coating TiO2 on the surfaces of barite particles through mechano-chemical method.The preparation parameters and pigment properties of B/TCP as well as the interaction mechanism between barite and TiO2 were studied.The results indicated that the mechanical co-grinding process and the proportion of TiO2 affected the properties of B/TCP significantly.B/TCP prepared under optimal conditions was similar to TiO2 in pigment properties.It was mainly the strong electrostatic attraction between barite and TiO2 in water that combined them firmly and then formed B/TCP.展开更多
The n-SiO2/Ni composite electro-brush plating coating was prepared on the 1045 steel substrate. SEM and TEM were utilized to analyze the surface and cross-section morphologies or the microstructures of the composite c...The n-SiO2/Ni composite electro-brush plating coating was prepared on the 1045 steel substrate. SEM and TEM were utilized to analyze the surface and cross-section morphologies or the microstructures of the composite coating before and after heat treatment, as well as a micro-hardness tester was used to measure the micro-hardness before and after heat treatment. The results show that the entrance of nano SiO2 particles into composite coating makes the micro-hardness higher. After heat treatment, due to the obstruction to growth of Ni crystals from nano particles, the composite coating still possesses a higher micro-hardness than that of common Ni-base coating.展开更多
Core-shell wollastonite@ TiO2(WOT)composite particles are prepared by a mechano-chemical method (MCM)to improve the dispersion of TiO2and reduce its dosage,and to achieve synergistic effects with the wollastonite mine...Core-shell wollastonite@ TiO2(WOT)composite particles are prepared by a mechano-chemical method (MCM)to improve the dispersion of TiO2and reduce its dosage,and to achieve synergistic effects with the wollastonite mineral.The crystal structure,morphology,functional groups,and pigment properties of the as-prepared composite powders are determined.The W@T composite particles are formed by van der Waals force in addition to electrostatic attraction and chemical bonding.The anatase TiO2coating is anchored on the woUastonite surface by Si-O-Ti and Ca-O-Ti bonds.The W@T powders possess excellent characteristics such as whiteness of 96.6%,hiding power of 17.97g/m^2,and oil absorption of 22.72g/100g.The properties of the W@T composite are similar to those of TiO2and the former,which is much cheaper,can potentially substitute the latter as a white paint in many applications.展开更多
基金Funded by the National Key Technology R&D Program of China(No.2008BAE60B06)Beijing Municipal Science&Technology Commission(No.Z080003032208015)
摘要Calcined kaolin/TiO2 composite particle material(CK/TCPM)was prepared with TiO2 coating on the surfaces of calcined kaolin particles by the mechano-chemical method.X-ray diffraction(XRD)and scanning electron microscope(SEM)were used to investigate the microstructures and morphologies,respectively.The mechanism of the mechano-chemical reaction between calcined kaolin and TiO2 was studied by infrared spectra(IR).The results show that TiO2 coats evenly on the surfaces of calcined kaolin particles by Si-O-Ti and Al-O-Ti bonds on their interfaces.The hiding power and whiteness of CK/TCPM are 17.12 g/m^2 and 95.7%,respectively,presenting its similarity to TiO2 in pigment properties.
基金Project(gf200901002)supported by the Open Research Fund of National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology of Nanchang Hangkong University,China
摘要ZrO2/TiO2 composite photocatalytic film was produced on the pure titanium substrate using in-situ Zr(OH)4 colloidal particle by the micro-arc oxidation technique and characterized by scanning electron microscope (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD) and ultraviolet-visible (UV-Vis) spectrophotometer. The composite film shows a lamellar and porous structure which consists of anatase, futile and ZrO2 phases. The optical absorption edge of film is shifted to longer wavelength when ZrO2 is introduced to TiO2. Furthermore, the photocatalytic reaction rate constants of degradation of rhodamine B solution with ZrO2/TiO2 composite film and pure TiO2 film under ultraviolet irradiation are measured as 0.0442 and 0.0186 h 1, respectively.
摘要The present study confers to the fabrication and its characterization of magnesium alloy(AZ91E)based nano composites with nano Al2O3particulate reinforcements.A novel Semi Solid stir casting technique was adopted for the fabrication of the composite.An average particle size of 50 nm was used as reinforcement to disperse in matrix.The effects of change in weight fraction of reinforcements on the distribution of particles,particle–matrix interfacial reactions,physical as well as mechanical properties were reported.The SEM and EDS analysis has shown the uniform distribution of particles in the composite along with the presence of elements.The mechanical properties of reinforced and unreinforced composite were evaluated and presented.Fractography of tensile specimens was also discussed.
基金National Key Technology R&D Program of China(2008BAE60B06)Beijing Municipal Science&Technology Commission(Z080003032208015)
摘要Barite/TiO2 composite particle(B/TCP)was prepared by coating TiO2 on the surfaces of barite particles through mechano-chemical method.The preparation parameters and pigment properties of B/TCP as well as the interaction mechanism between barite and TiO2 were studied.The results indicated that the mechanical co-grinding process and the proportion of TiO2 affected the properties of B/TCP significantly.B/TCP prepared under optimal conditions was similar to TiO2 in pigment properties.It was mainly the strong electrostatic attraction between barite and TiO2 in water that combined them firmly and then formed B/TCP.
基金Project(50235030) supported by the National Natural Science Foundation of China Project(G1999065009) supported by the National Basic Research Program of China Project(2003AA331130) supported by the Hi-tech Research and Development Program of China
摘要The n-SiO2/Ni composite electro-brush plating coating was prepared on the 1045 steel substrate. SEM and TEM were utilized to analyze the surface and cross-section morphologies or the microstructures of the composite coating before and after heat treatment, as well as a micro-hardness tester was used to measure the micro-hardness before and after heat treatment. The results show that the entrance of nano SiO2 particles into composite coating makes the micro-hardness higher. After heat treatment, due to the obstruction to growth of Ni crystals from nano particles, the composite coating still possesses a higher micro-hardness than that of common Ni-base coating.
基金the Fundamental Research Funds for the Central Universities of China (No. 2011PY0169)National Natural Science Foundation of China (NSFC) (Nos.51144011and 51474194)City University of Hong Kong Applied Research Grants (ARG),China,Nos.9667104and 9667122.
摘要Core-shell wollastonite@ TiO2(WOT)composite particles are prepared by a mechano-chemical method (MCM)to improve the dispersion of TiO2and reduce its dosage,and to achieve synergistic effects with the wollastonite mineral.The crystal structure,morphology,functional groups,and pigment properties of the as-prepared composite powders are determined.The W@T composite particles are formed by van der Waals force in addition to electrostatic attraction and chemical bonding.The anatase TiO2coating is anchored on the woUastonite surface by Si-O-Ti and Ca-O-Ti bonds.The W@T powders possess excellent characteristics such as whiteness of 96.6%,hiding power of 17.97g/m^2,and oil absorption of 22.72g/100g.The properties of the W@T composite are similar to those of TiO2and the former,which is much cheaper,can potentially substitute the latter as a white paint in many applications.