Abstract: The invention discloses a method for producing a nitrogen-silicon containing stainless steel layer on a metal. The method includes a pack cementation process involving the use of silicon nitride, silica and sodium fluoride as the source materials.

Abstract: A dual-chip integrated circuit (IC) package is provided, which is characterized in the use of a an extending portion formed from the leads of a leadframe to provide firm support to the bonding pads on the chips. The dual-chip integrated circuit package utilizes a leadframe having a first leads and a second leads, with a spacing being defined between the first and second leads; and the first leads is extended toward the spacing to form the extending portion at a downset position with respect to the second plane where the leadframe positions leads. A first integrated circuit chip is mounted on the extending portion in such a manner that the front side thereof is attached to the extending portion; and a second integrated circuit chip is attached to the first integrated circuit chip in a back-to-back manner. The bonding pads on the two integrated circuit chips are electrically connected to the first and second leads via a plurality of bonding wires.

Abstract: A wafer sawing/grinding process capable of removing cracks and chipping resulted from a wafer sawing operation. A silicon wafer having an active surface and a back surface is provided. A first tape is attached to the back surface of the wafer and then the wafer is sawn along kerfs between neighboring silicon chips. A second tape is attached to the active surface of the silicon wafer before removing the first tape. The back surface of the wafer is then ground until the wafer reaches a desired thickness. A third tape is attached to the ground back surface of the wafer before removing the second tape.

Abstract: A process for producing a nitrogen-alloyed stainless steel layer on steel by applying nitride containing mixed metal powder or stainless powder to the steel surface, and thereafter treating the steel with laser beams.

Abstract: The surface of stainless steel can be hardened by coating a silicon nitride gel and then scanning by CO.sub.2 laser to form a surface alloy layer thereon. The thickness and hardness of the surface alloy layer are both uniform. The Vicker's hardness of the layer can be as high as 1200 Hv. This method can be operated in a common atmosphere or nitride atmosphere at normal pressure, therefore it is more economic than ion nitriding or plasma nitriding.