Industrial Technology Research Institute

National Taiwan University

Fourteen Design Company Limited

Chung-Ping Lai

Ai-Kang Li

Cheng-Tsu Fu

Jia-Ruey Duann

Kai-Li Ko

Ming-Hong Yeh

Wen-Jong Wu

Yang-Bee Lee

Rung-huei Liang

Chih-Ying Yang

Shiang-Wen Cheng

Yi-Chu Lin

Kung-Ting Tsai

Cheng-Dar Chiang

Wan-Chi Chang

The invention provides a two-sided auxiliary structure for induction cards, which comprises: a metal shield layer; and two high-conductivity magnetic layers, which are respectively set on two opposite sides of the metal shield layer, wherein the area of the metal shield layer is greater than those of the two high-conductivity magnetic layers. The two-sided auxiliary structure for induction cards of the invention improves the problem of poor induction success rate of plural induction cards.

Two-sided auxiliary structure for induction cards

A multimedia player includes an execution button for generating an execute instruction when operated, an auxiliary card associated with a file managing instruction, an auxiliary card reader for electrically connecting with the auxiliary card, and a control unit electrically connected to the execution button and the auxiliary card reader. The control unit is operable, in response to the execute instruction from the execution button, to execute the file managing instruction associated with the auxiliary card that is electrically connected to the auxiliary card reader.

Multimedia player and method of operating the same

A composite ceramic block gauge is formed from a tungsten carbide (WC) reinforced phase and a chromium carbide (Cr.sub.3 C.sub.2) matrix. The finished block gauge possesses excellent properties such as hardness and corrosion resistance and high reflectivity. The block gauges made from Cr.sub.3 C.sub.2 /WC composites can be calibrated using the traditional optical interferometry techniques.

Method for forming chromium carbide based ceramics composite block gauge

According to this invention, a novel marking method for block gauges employing an improved electron discharge marking approach is provided. The method for marking on the surface of a block gauge, comprising:

Marking of block gauges

A high performance ceramic composite containing tungsten carbide reinforced chromium carbide matrix in which 5.about.35 vol % of tungsten carbide particles are uniformly dispersed in 65.about.95 vol % of chromium carbide matrix. The diameters of the tungsten carbide and chromium carbide particles are preferably in the rage between 0.1.about.10 .mu.m, and their average diameters are preferably at about 2.0 and 1.5 .mu.m, respectively. The tungsten carbide/chromium carbide composite is prepared from a sintering process by applying heat and pressure to a green compact containing tungsten carbide and chromium carbide particles, without using a metallic sintering aid. As a result, the tungsten carbide reinforced chromium carbide composite retains all the advantageous characteristics of the chromium carbide material, such as excellent strength, hardness, anti-oxidation, anti-scaling, anti-erosion and anti-corrosion properties as well as excellent permanent non-magnetizability and surface lustrousness, while providing improved flexural strength and fracture toughness. The tungsten carbide reinforced chromium carbide composite is most suitable for industrial applications where reliability is critical.

High performance ceramic composites containing tungsten carbide

A composite ceramic block gauge and its preparing method is disclosed. The ceramic block gauge comprises a tungsten carbide (WC) reinforced phase and a chromium carbide (Cr.sub.3 C.sub.2) matrix. The finished block gauge possesses excellent properties such as hardness and corrosion resistance and high reflectivity. The block gauges made from Cr.sub.3 C.sub.2 /WC composites can be calibrated using the traditional optical interferometry techniques.

Chromium carbide based ceramics composite block gauge

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Taipei, Taiwan

Chung-Ping Lai