Vol. 8 & Issue 1 ; Section C : Physical Sciences

Date : Nov.2017 to Jan.2018

 

The Study of a factor to the Carbon Nanotubes Film

Caiping Xi,

JCBPS; Section C; November 2017 – January 2018, Vol. 8, No. 1; 001-006,

[DOI: 10.24214/jcbps.C.8.1.00106.]

  • Abstract

    We do an experiment to prepare the carbon nanotubes. One of the factors affecting the preparation of carbon nanotubes was studied in the article. The experimental results were described by scanning electron microscopy and Raman spectroscopy. The results show that Hydrogen plays important role in the grown of carbon nanotubes and the best Hydrogen Flow of the carbon nanotubes is 30sccm

Corrosion behaviour of heat treatment Cu-Al-Be shape memory alloy in simulation body fluid

Jafar Tahar Al-haidary*, Ali Munder Mastafa, Ahmed Aziz Hamza,

JCBPS; Section C; November 2017 – January 2018, Vol. 8, No. 1; 007-015,

[DOI: 10.24214/jcbps.C.8.1.00715.]

  • Abstract

    Corrosion behaviour of Cu-13Al%-0.545Be% shape memory alloy chemical composition at different microstructure in simulation body fluid by open circuit potential, tafal polarization, cyclic polarization .the microstructure of this alloy that aging at 550 ºC for 2,4 and 6 hour was study by optical microscope and x-ray diffraction (XRD). The transformation temperature of this alloy determined by differential scanning calorimeter (DSC).the result of this test show increase aging time and temperature increase percent of λ2 phase and the alloy with martensite phase have corrosion resistance than alloy with different phases

Microstructure and Microhardness upon High Temperature Heat Treatments in an Nb-Ti-Cr-Si Based Ultrahigh Temperature Alloy

 

Baohui Guo,

JCBPS; Section C ; November 2017 – January - 2018, Vol. 8, No. 1; 016-027,

[DOI: 10.24214/jcbps.C.8.1. 01627.]

  • Abstract

    In order to investigate the effects of high temperature heat treatments on the microstructures and microhardness of an Nb-Ti-Cr-Si based ultrahigh temperature alloy, coupons were homogenized at 1200~1500℃ for 24h and then aged at 1000℃ for 24h. The results show The Nb-Ti-Cr-Si based ultrahigh temperature alloy is composed of Nbss, (Nb,X)5Si3 and Cr2Nb phases after various homogenizing and aging treatments. HfO2 is found in the alloy after heat treatment both at 1500°C for 24 h and 1500°C for 24 h then 1000°C for 24 h. With increase in heat-treatment temperature, previous Nbss dendrites in the arc-melted alloy transform into Nbss equaxied crystals. The previous Nbss/(Nb,X)5Si3 eutectic colonies break into small (Nb,X)5Si3 blocks in Nbss matrix, whereas the previous Nbss/Cr2Nb eutectic colonies in arc-melted microstructure transform into needle-like Laves after homogenizing treatment at 1200°C for 24 h and become coarse Laves blocks after homogenizing at 1300°C for 24 h. The previous Laves Cr2Nb particles dissolve into Nbss during homogenizing treatment at 1400°C for 24 h, and much finer and crowded Cr2Nb platelets form during cooling. These observations suggest that the previous coarse Laves phase particles dissolve between 1300 and 1400°C, and the Ti and Cr concentrations decrease with increase in heat-treatment temperatures. Aging at 1000°C for 24h after homogenizing treatments improves the precipitation of fine needle-like Cr2Nb in Nbss matrix and Cr concentration in Nbss reduces. The variation of partitioning ratios of alloying elements among Nbss, (Nb,X)5Si3 and Cr2Nb causes the change in microhardness of Nbss and (Nb,X)5Si3. The microhardness of Nbss and (Nb,X)5Si3 reaches the maximum value after 1300℃/24h+1000℃/24h heat treatment.

Study on Light Interference Simulation and Performance Evaluation of Low light Imaging System

YUAN Wei and Wang Ze Yu,

JCBPS; Section C ; November 2017 – January - 2018, Vol. 8, No. 1; 028-036.

[DOI: 10.24214/jcbps.C.8.1.02836.]

  • Abstract

    For the modern battlefield influence flares, fire and other battlefield equipment shimmer light source for imaging performance, such as reconnaissance capability, through the study of the interference signal response mechanism are low light level imaging equipment, optical equipment, gain characteristics, and quantitative analysis of the battlefield fire and flares affect both light sources of interference imaging reconnaissance system for low light level imaging performance, respectively, to simulate the interference source is located in a different location, after radiation - the output image after the combined effect of shimmer system response system, revealing micro - transmission optical imaging equipment in the imaging light interference conditions under the law, the establishment of a study to assess the effect on image quality and detection distance changes under strong interference.