National Central University

Jing-Chie Lin

Che-Wei Hsu

Sheng-Long Lee

Chien-Ming Lai

Chien-Wei Chen

Ten-Fu Wu

Cheng-Yu Chou

Fu-Kai Hsu

Yin-Chun Cheng

Cheng-En Jiang

Chih-Chang Tsai

Chia-Wang Weng

Wen-Chu Hsiao

Chien-Chang Chiang

A method for making Mg(magnesium)-based intermetallic compound uses a thermal process during a melting process to produce largely the Mg-based intermetallic compound. The vapor pressure of Mg is high, thereby Mg is prone to be vaporized from a melt and a wrought solid alloy in the melting process of high temperature, for purifying the wrought Mg-based intermetallic compound. The method may simplify the process and devices for making the Mg-based intermetallic compound, and produce efficiently a larger of high purity Mg-based intermetallic compound.

Method for making Mg-based intermetallic compound

The present invention provides a new method to obtain an effective diffusivity for a certain substance in solutions that diffuse through a porous material. The porous material initially separates two solutions that are different in concentration of the substance. The concentration gradient gives rise to diffusion through the porous material, The concentration change of the substance in the low-concentration compartment is detected through a measurement of the electrochemical impedance data. By means of the measurement, an effective diffusivity coefficient of the substance through the porous material is calculated.

Method for determining effective diffusivity of substances through porous materials

A manufacturing method for an isothermal evaporation casting process is disclosed and to design the manufacturing method for the simple atmospheric casting. The present invention can melt the Mg&#x2014;Ni alloy with the aspect of totally different melting points thereof, and the other elements can be added during melting simultaneously. Through the Mg&#x2014;Ni alloy with a suitable weight ratio, the eutectic alloy of Mg/MgNi and high purified &#x3b3;-phase MgNi can be made. Then adding other elements are to produce the composition of Mg/Ni/M. By way of the manufacturing method of the present invention, the melting equipment is simplified; and, through different manufacturing steps, the purposes of time-saving and low cost are reached; further that, a large amount of the eutectic alloy of Mg/MgNi with different kinds of ratios of Mg, high purified &#x3b3;-phase MgNi, or the composition of Mg/Ni/M can be obtained.

Manufacturing method for isothermal evaporation casting process

A method for using ammonium fluoride solution in a photoelectrochemical etching process of a silicon wafer, comprising steps of: placing a wafer after the pre-etching process into an alcohol solution for activating the surface of wafer and into an ammonium fluoride solution as an etching solution; and illuminating the back of wafer with a halogen light and performing a photoelectrochemical etching process in a potentiostatic.

Method for using ammonium fluoride solution in a photoelectrochemical etching process of a silicon wafer

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Jhongli, Taiwan

Jing-Chie Lin