With admixture of n-diamond and diamond-like carbon powders （DLC） as carbon source, transparent wafers have been synthesized by hydrothermal process at 100℃ and atmosphere pressure. Scanning electron microscopy, X-ray diffraction, Raman spectroscopy, transmission electron microscopy, electron-probe microanalysis and Fourier-transform infrared spectrometer were used to analyze those transparent wafers. These results indicated that the transparent wafers were amorphous sp^3-banding carbon wafer, and that the wafers were not aggregate of DLC from the carbon source but a new kind of reaction product by hydrothermal treatment.
研究了强磁场对共晶铝硅合金变质效果的影响.对共晶A l-12.6%S i合金进行N a盐变质处理,发现施加强磁场的条件下,在变质剂反应温度下保温20 m in,共晶硅细化,并呈现一定程度的粒状化,其变质效果明显优于不施加强磁场.760℃下延长保温时间至40 m in,未施加强磁场条件下的试样出现严重的变质衰退现象,施加强磁场的试样变质衰退现象相对较轻.在施加强磁场条件下,即使保温40 m in,其变质效果也优于不施加强磁场时保温20m in时的,即强磁场具有一定的延长变质有效时间的作用.分析认为强磁场抑制对流是其中的原因之一.
