2results about How to "Avoid defects such as pores" patented technology

This invention relates to the field of photoelectrochemistry and discloses a tungsten-doped bismuth vanadate single-crystal electrode and its preparation method. The single-crystal electrode comprises: an insulating support substrate; a conductive layer disposed on a designated area of ​​the insulating support substrate; and a tungsten-doped bismuth vanadate single-crystal layer bonded to the conductive layer. The surface roughness Sa of the tungsten-doped bismuth vanadate single-crystal layer is 0.5 nm to 5.0 nm, and the thickness is 0.2 mm to 1 mm. The periphery of the tungsten-doped bismuth vanadate single-crystal layer is encapsulated with an insulating and waterproof material, and the insulating and waterproof material covers the exposed area of ​​the conductive layer. This invention can improve the chemical stability and photo-water splitting capability of the single-crystal electrode.

The utility model relates to foundry production field discloses a kind of spliced quick change type casting sand mould moulds, including female die, the top of female die is provided with male die, the upper surface of male die is penetrated and is fixedly connected with feed pipe, the inner surface of male die is provided with change mechanism, the top of male die is provided with feed assembly;The change mechanism includes positioning assembly, the positioning assembly includes moving plate, the outer wall of male die is penetrated and is slidably connected in moving plate, the left surface of moving plate is fixedly connected with pressure block, the inner wall of male die right side is elastically connected with clamping block by compression spring.The utility model in, through positioning assembly and mounting assembly cooperation in change mechanism, using the effect of clamping block, compression spring and moving plate and other structures, the quick plug-in locking and disassembly of top die and bottom die can be realized, without integral replacement mould and frequent disassembly feed pipe, shorten change time, improve production efficiency.