2results about How to "Rapid sample preparation" patented technology

This invention provides a method, replica film, and application for directly detecting silicon nitride grain boundary phases. The method includes the following steps: S1, etching a polished silicon nitride ceramic sample with hydrofluoric acid solution; S2, replicating the etched polished surface with a first solvent and a cellulose acetate film to obtain a primary replica; S3, vacuum-depositing a carbon film onto the primary replica to obtain a secondary replica; S4, cutting and attaching the secondary replica film to low-temperature paraffin wax, then dissolving the cellulose acetate in a second solvent; S5, transferring the dissolved secondary replica film to a third solvent, and after the secondary replica film has fully expanded, retrieving it with a copper mesh, drying it, and observing it under an electron microscope. The method provided by this invention can separate the grain boundary phase from the silicon nitride main phase, obtaining the solid grain boundary phase while retaining the morphological outline of the silicon nitride main phase. This method is simple to operate, low in cost, and provides great convenience for studying the influence of grain boundary phases on the mechanical and optical properties of silicon nitride separately.

The utility model relates to the technical field of dies, and discloses a dumbbell-shaped sampling cutting die with a flexible glue structure, which comprises an upper pressing plate, a base is movably mounted at the bottom of the upper pressing plate, and a second dumbbell-shaped groove is formed in the outer surface of the inner side of the upper pressing plate. When the dumbbell-shaped blades touch the tops of the second dumbbell-shaped grooves, samples can extrude the dumbbell-shaped containing plates through the dumbbell-shaped convex blocks on the inner sides of the second dumbbell-shaped grooves, and when the dumbbell-shaped containing plates are extruded, the springs on the inner sides of the dumbbell-shaped blades uniformly distributed on the outer surface of the base generate elastic deformation; compared with a traditional device, the device has the advantages that an operator does not need to stretch the hand near a cutter to take a sample, so that the possibility that the operator is scratched by the cutter is greatly reduced, the safety of the operator is effectively guaranteed, meanwhile, the sample can be rapidly prepared, and the device is convenient, rapid and high in efficiency; and the sample can be completely separated from the cutting die.