CaN nanorods are successfully fabricated by adjusting the flow rate ratio of hydrogen （H2）/nitrogen （N2） and growth temperature of the selective area growth （SAG） method with metal organic chemical vapor deposit...CaN nanorods are successfully fabricated by adjusting the flow rate ratio of hydrogen （H2）/nitrogen （N2） and growth temperature of the selective area growth （SAG） method with metal organic chemical vapor deposition （MOCVD）. The SAG template is obtained by nanospherical-lens photolithography. It is found that increasing the flow rate of 1-12 will change the CaN crystal shape from pyramid to vertical rod, while increasing the growth temperature will reduce the diameters of GaN rods to nanometer scale. Finally the CaN nanorods with smooth lateral surface and relatively good quality are obtained under the condition that the H2：N2 ratio is 1：1 and the growth temperature is 1030℃. The good crystal quality and orientation of GaN nanorods are confirmed by high resolution transmission electron microscopy. The cathodoluminescence spectrum suggests that the crystal and optical quality is also improved with increasing the temperature.展开更多
The plasma parameters in ICP-CVD system with internal low inductance antennas（LIA） were diagnosed by Langmuir probe.The ions density（Ni） reached 1011-1012 cm-3,and the electron temperature（Te） was below ca.2 eV,...The plasma parameters in ICP-CVD system with internal low inductance antennas（LIA） were diagnosed by Langmuir probe.The ions density（Ni） reached 1011-1012 cm-3,and the electron temperature（Te） was below ca.2 eV,which was slightly decreased with applied power.A p-type hydrogenated microcrystalline silicon（μc-Si：H） film was prepared on glass substrate.After optimization of the processing parameters in flow ratio of SiH4：B2H6：H2,a high quality μc-Si：H film with deposition rate above 1.0 nm/s was achieved in this work.展开更多
The effects of parameters, in the process of plasma-sprayed ceramic coating, upon the deposition efficiency of alumina-13 wt.% titania composite coatings are reported. The coatings were prepared by the atmospheric pla...The effects of parameters, in the process of plasma-sprayed ceramic coating, upon the deposition efficiency of alumina-13 wt.% titania composite coatings are reported. The coatings were prepared by the atmospheric plasma spray process. The plasma torch input power, flow rates of primary, secondary and carrier gas, powder feed rate and spraying distance were considered as variables. The results show that the variations in all the selected spraying parameters strongly affect the deposition efficiency. The micro-hardness, as well as erosive and sliding wear rates of the coating are also affected by these parameters. Especially the input power strongly affects the phase and microstructure of the coatings.展开更多
： Successful co-deposition of fine particulate matter within an Electroless Nickel-Phosphorous （ENi-P） matrix is dependent on various factors like bath composition, particle compatibility with metallic matrix, bath...： Successful co-deposition of fine particulate matter within an Electroless Nickel-Phosphorous （ENi-P） matrix is dependent on various factors like bath composition, particle compatibility with metallic matrix, bath reactivity （pH）, particle size and their distribution. ENi-P deposits incorporating Al2O3/ Alumina in a disperse phase have varied effects on properties and attributes like surface roughness （Ra／ microhardness, wear resistance, corrosion resistance and surface morphology of the deposits obtained. This paper experimentally investigates the effect of alumina （1.55 g/L） on Ra, microhardness, surface morphology, deposition rate, wettability, wear resistance and corrosion resistance of ENi-P-Al2O3 composite deposits on mild steel substrates at bath pH 5, 7 and 9. Study reveals that optimum deposit parameters and deposition rates are achieved with bath pH. However, not much study has been undertaken concerning composite deposits obtained from higher bath pH or basic bath. This is attributable to the fact that at higher bath pH or alkaline baths, the bath gets unstable and eventually degrades or decomposes, thereby resulting in sub optimal or poor deposition. Hence, experimental investigations carried out by preparing suitable baths, operating under optimum conditions, and enabling successful composite deposition in acidic and alkaline baths have revealed that there is a significant improvement in the above mentioned properties of the as-deposited composite deposits, as the pH is increased from pH 5 to pH 9. This aspect can therefore be advantageously utilized for preparing various marine components like fasteners, nuts, bolts, washers, pipes, cables, components having relative motion etc.展开更多
基金Supported by the Key Program of the National Natural Science Foundation of China under Grant No 61334009the National High Technology Research and Development Program of China under Grant No 2014AA032604
文摘CaN nanorods are successfully fabricated by adjusting the flow rate ratio of hydrogen （H2）/nitrogen （N2） and growth temperature of the selective area growth （SAG） method with metal organic chemical vapor deposition （MOCVD）. The SAG template is obtained by nanospherical-lens photolithography. It is found that increasing the flow rate of 1-12 will change the CaN crystal shape from pyramid to vertical rod, while increasing the growth temperature will reduce the diameters of GaN rods to nanometer scale. Finally the CaN nanorods with smooth lateral surface and relatively good quality are obtained under the condition that the H2：N2 ratio is 1：1 and the growth temperature is 1030℃. The good crystal quality and orientation of GaN nanorods are confirmed by high resolution transmission electron microscopy. The cathodoluminescence spectrum suggests that the crystal and optical quality is also improved with increasing the temperature.
基金supported by National Natural Science Foundation of China(Nos.11175024,11375031),2011BAD24B01,KM 201110015008,KM 201010015005,BIGC Key Project(No.23190113051)and PHR20110516,PHR201107145
文摘The plasma parameters in ICP-CVD system with internal low inductance antennas（LIA） were diagnosed by Langmuir probe.The ions density（Ni） reached 1011-1012 cm-3,and the electron temperature（Te） was below ca.2 eV,which was slightly decreased with applied power.A p-type hydrogenated microcrystalline silicon（μc-Si：H） film was prepared on glass substrate.After optimization of the processing parameters in flow ratio of SiH4：B2H6：H2,a high quality μc-Si：H film with deposition rate above 1.0 nm/s was achieved in this work.
基金supported by a grant from The Department of Science and Technology(DST), Government of India
文摘The effects of parameters, in the process of plasma-sprayed ceramic coating, upon the deposition efficiency of alumina-13 wt.% titania composite coatings are reported. The coatings were prepared by the atmospheric plasma spray process. The plasma torch input power, flow rates of primary, secondary and carrier gas, powder feed rate and spraying distance were considered as variables. The results show that the variations in all the selected spraying parameters strongly affect the deposition efficiency. The micro-hardness, as well as erosive and sliding wear rates of the coating are also affected by these parameters. Especially the input power strongly affects the phase and microstructure of the coatings.
文摘： Successful co-deposition of fine particulate matter within an Electroless Nickel-Phosphorous （ENi-P） matrix is dependent on various factors like bath composition, particle compatibility with metallic matrix, bath reactivity （pH）, particle size and their distribution. ENi-P deposits incorporating Al2O3/ Alumina in a disperse phase have varied effects on properties and attributes like surface roughness （Ra／ microhardness, wear resistance, corrosion resistance and surface morphology of the deposits obtained. This paper experimentally investigates the effect of alumina （1.55 g/L） on Ra, microhardness, surface morphology, deposition rate, wettability, wear resistance and corrosion resistance of ENi-P-Al2O3 composite deposits on mild steel substrates at bath pH 5, 7 and 9. Study reveals that optimum deposit parameters and deposition rates are achieved with bath pH. However, not much study has been undertaken concerning composite deposits obtained from higher bath pH or basic bath. This is attributable to the fact that at higher bath pH or alkaline baths, the bath gets unstable and eventually degrades or decomposes, thereby resulting in sub optimal or poor deposition. Hence, experimental investigations carried out by preparing suitable baths, operating under optimum conditions, and enabling successful composite deposition in acidic and alkaline baths have revealed that there is a significant improvement in the above mentioned properties of the as-deposited composite deposits, as the pH is increased from pH 5 to pH 9. This aspect can therefore be advantageously utilized for preparing various marine components like fasteners, nuts, bolts, washers, pipes, cables, components having relative motion etc.
