30results about How to "Reduce thermal mismatch stress" patented technology

The invention provides an YSZ-rare earth zirconate thermal barrier coating of a gradient structure and a preparation method thereof. The coating material comprises an adhesive layer, an 8YSZ-rare earth zirconate gradient layer and a surface layer. The 8YSZ-rare earth zirconate material has relatively low conductivity, high-temperature sintering resistance and excellent resistance to heat shocks, and also can prevent oxygen from entering the adhesive layer on active service to alleviate oxidization of the adhesive layer to form TGO. The heat mismatching stress of the material can be reduced bymeans of an optimized design of the gradient structure, so that the heat stability of the whole material member is improved; the surface layer is a CMAS corrosion layer, so that the problem that an existing YSZ coating is corroded by CMAS can be alleviated. As Pd or a oxide ceramic layer is adopted, CMAS molten at a high temperature is not wet in the surface layer, and the rolling angle is small,and CMAS is hardly attached to the surface of the coating, so that CMAS corrosion is avoided.

The disclosed non-polar composite GaN-based substrate comprises overlays between the substrate and the GaN extension layer reflection / ohm / stress buffer layer. Wherein, the preparation method for the substrate comprises: on the growth substrate, growing middle medium layer (or crystal kernel) and the non-polar first GaN-based extension layer in turn; overlaying the mask layer; etching the mask to form the GaN window and mask layer strip; growing the non-polar second GaN extension layer; overlaying the reflection / ohm / stress buffer layer; bonding substrate; peeling the substrate, medium layer, the first extension layer, mask strip, and the part with hole on the second extension layer; exposing other part of the second extension layer for thermal treatment.

The invention discloses a filling material for manufacturing a layered electromagnetic thin film material swelling sample and a method for preparing the filling material, and provides a method for adopting the filling material to manufacture the layered electromagnetic thin film material swelling sample. The method includes the steps that firstly, a through hole is machined in a silicon dioxide substrate through a precision micromachining method; the through hole is filled with a specially-made mixing material, and metallographic phase polishing processing is conducted on the through hole; the surface of the substrate is plated with an annular bottom electrode through an ion sputtering method, a ferroelectric thin film and a ferromagnetic thin film are sequentially deposited through a sol-gel method, annealing is conducted, and an annular top electrode is deposited on the surfaces of the thin films after being cleaned and dried; acetone analytical reagents and a sodium hydroxide solution are used for corrosion to remove the filling material in the through hole, an independently-supported thin film window is formed, and then the electromagnetic thin film swelling sample suitable for a swelling test is obtained. The method is easy and convenient to operate and high in manufacturing efficiency, and the manufacturing method of the layered electromagnetic thin film material swelling sample is suitable for the swelling test.

The invention discloses a metal workpiece double layer coating suitable for high temperature environment and a manufacturing method thereof. The manufacturing method of the metal workpiece double layer coating suitable for the high temperature environment includes the following steps of 1) pretreatment: degreasing the surface of a metal workpiece, sandblasting roughening and cleaning; 2) spraying:preheating the pretreated metal workpiece, adopting an atmospheric plasma spraying device for spraying, first spraying a ceramic inner layer on the surface of the metal workpiece, then heating and spraying a metal outer layer and then spraying a metal layer on the side of an obtained coating; 3) heat treatment: conducting vacuum heat treatment on the sprayed metal workpiece and conducting gas quenching. According to the manufacturing method, the metal layer is sprayed on the ceramic layer. On one hand, the high cost of ceramic precision machining is reduced; on the other hand, various corrosion-resistant or wear-resistant alloy materials can be applied. In addition, the melting point of metal is lower than that of the ceramic, and the mechanical properties of the coating can be changed bythe heat treatment process.