47results about How to "Crystal phase stability" patented technology

The invention relates to a stable zirconia ceramic target material for electron beam physic vapor deposition (EB-PVD), and its preparation method, and belongs to the ceramic material preparation field. The ceramic target material with a good deposition performance is obtained by adopting a two-step solid phase sintering process with highly pure zirconia and an oxide stabilizer as raw materials. The preparation method comprises the following steps: carrying out high temperature solid phase synthesis and ball milling to prepare ceramic powder raw materials with stable crystal phase and uniform granularity, carrying out high pressure molding through combining molding pre-pressing with isostatic pressing, carrying out dimensional fine finishing, and carrying out low temperature sintering to prepare the EB-PVD ceramic target material. The ceramic target material prepared in the invention has the advantages of accurate chemical components, stable crystal phase, and small high-temperature volume deformation, has a microscopic crystal grain size uniformity of below 5mum, and satisfies technologic requirements of no splashing of the EB-PVD technology, and stable composition and performances of the obtained coating. The two-step solid phase sintering process realizes a short high temperature sintering time, low temperature heat treatment of the target material reduces the energy consumption, and the preparation method has the advantages of simple technology and equipment, good batch performance stability, and realization of the popularization to the industrialized production.

The invention relates to a method for preparing a glass microfibre reinforcement nano-hydroxyapatite biological composite coating, comprising the following steps of: firstly, mixing Ca(NO3)2.4H2O and (NH2)2HPO4 and adding distilled water to dissolve; then adding urea powder to make the mixture into mixed liquor; putting a generating head of a multi-frequency phonochemistry generator into the mixed liquor, filtering and drying after phonochemistry synthesis, then obtaining nano-HAp powder; dispersing the nano-HAp powder, analytically pure chitosan and glass microfibre in isopropanol, then obtaining suspending liquid; pouring the suspending liquid into a hydrothermal electrophoresis reaction kettle; putting the reaction kettle in a precise constant temperature oven, galvanizing and depositing; then drying and finally obtaining the composite coating. Nano-hydroxyapatite powder is prepared by using a phonochemistry synthesis method, and therefore, the prepared composite coating is compactand even, the crystalline phase of the coating is stable, the bonding strength can be greatly increased; and the expected bonding strength reaches 20-40MPa.

The present invention involves a high -entropy acid saline inorganic fiber and its preparation methods.The preparation method includes alkaline carbonate, calcium source, 锶 source, 钡 source, methamphetamine, and spinning agent in accordance with a certain proportion to heated and dissolved in the aqueous solution to make high -entropiic acid precursor anterior drivers;The precursor of the salt front drive body is obtained by the electrostatic spinning method to obtain a high -entropyed pyrine before the fiber fiber;The solution is stable and the spinning is good. The high -entropyed pyrine fiber is single -phase solid -soluble, the diameter of the fiber is 0.5‑1.5 μm, and the crystal and fiber form are kept stable at room temperature to 1400 ° C.

The invention discloses a diamond grinding wheel for metal binding agent. The diamond grinding wheel for metal binding agent is characterized bu being made up of metal powder, copper-cerium alloys, pore-forming agents, TS-1 titanium silicalite molecular sieves and diamond composite abrasive grains; the metal powder is iron powder, copper powder, nickel powder and tin powder; the pore-forming agents can be PE / CeO2 / Cu compound; and the diamond composite abrasive grains are diamond / cerium oxide nuclear shell composite abrasive grains. According to the invention, the defects of poor self-sharpening property and low efficiency of the diamond grinding wheel for the metal binding agent are overcome; and the diamond grinding wheel for the metal binding agent has good mechanical property and self-sharpening property, and is high in holding force of diamond, good in molding property and long in service life.

The invention provides a cubic phase Cu 3 Sb 3 Based thermoelectric materials, the general chemical formula is Cu 3 Sb 1‑x A x S 3 , where A is cobalt and / or nickel, and x is 0.025-0.200. By replacing Sb elements with Ni, Co and other elements, a Cu with stable structure and thermodynamic properties is synthesized. 3 Sb 1‑ x A x S 3 Cubic crystal structure. Its preparation method mainly comprises the following steps: 1) batching: according to Cu 3 Sb 1‑x A x S 3 The ratio of each element in the method takes copper, antimony, cobalt (nickel) and sulfur as the reaction raw materials, wherein x=0.025~0.200; Perform high-energy ball milling; 3) Densification: The powder obtained by high-energy ball milling is subjected to spark plasma sintering or hot-pressing sintering to obtain high-density, high-performance cubic phase Cu 3 Sb 3 bulk thermoelectric material. Cu according to the present invention 3 Sb 1‑ x A x S 3 Thermoelectric materials are high-purity cubic phase products with high density, stable thermodynamic performance, excellent thermoelectric performance, abundant and cheap raw material sources, and good feasibility and repeatability of the preparation process.