36results about How to "Good repeatability of the preparation process" patented technology

The invention belongs to the field of porcelain materials and preparation thereof, and in particular relates to a multilayer semitransparent zirconia full-porcelain dental repair material and a preparation method thereof. The material comprises the chemical ingredients such as magnesium oxide and part stable square-phase zirconia, wherein the molecular contents of the magnesium oxide and the zirconia are respectively 2-10% and 90-98%; the part stable square-phase zirconia is added with a modifying agent to be modified, wherein the molar ratio of the modifying agent and the part stable square-phase zirconia is 1: (0.01-0.1); and a coloring agent is added into the modified zirconia repair material, and the coloring agent and the modified zirconia repair material respectively account for 0.1-1% and 99-99.9%. The method comprises the following steps of power preparing, mixing and granulating, two-step forming, plastic discharging and sintering. Compared with the prior art, the material has the advantages of good producing technology repeatability, stable quality, reliable performance and convenience in production.

The invention relates to a nanocomposite coating and a preparation technology of the nanocomposite coating, in particular to a preparation process for a high-Al-content AlCrN nanocomposite coating. The AlCrN nanocomposite coating is prepared on a metal or cemented carbide substrate by the adoption of an electric arc ion plating technology. Pure metal Al and Cr are used as targets, and the content of Al and Cr in the coating is adjusted and controlled by controlling the current of the Al targets and the Cr targets. The four pure Cr targets and the four pure Al targets are evenly distributed on the inner wall of a furnace body at intervals. Ar gas is introduced firstly before film plating, the bias pressure of 600-1,000 V is adopted, glow cleaning is conducted on the substrate for 10-20 min, then the Cr targets are opened, bombardment cleaning is conducted on the substrate, the bias pressure is gradually lowered to 30-100 V, and the metal Cr layer is deposited. The preparation process of the AlCrN nanocomposite coating is simple, and industrial production is facilitated; and the prepared AlCrN coating has the high hardness and strength and good high-temperature and oxidation resistance and corrosion resistance.

The invention relates to a lead-free piezoelectric potassium sodium niobate optoelectronic multifunctional material and a preparation method thereof and belongs to the technical field of luminescent materials. According to the invention, the fluorescence property and the piezoelectric property of a lead-free piezoelectric potassium sodium niobate material are remarkably increased by utilizing the synergistic combination effect between rare earth ion and metal ion. The multifunctional material disclosed by the invention comprises the following components in percentage by mass: (K0.5Na0.5) (1-y-x) MyLnxNb (1-y) TiyO3, wherein the Ln is selected from at least one of Sm, Pr and Eu; M is one or more than one ion in metal elements Ca, Sr and Ba; x is greater than 0 and less than or equal to 0.05; y is greater than 0 and less than or equal to 0.2. The multifunctional material disclosed by the invention is formed by mixing a certain amount of rare earth element into (K0.5Na0.5) NbO3 (KNN) host material with a perovskite structure; in the meantime, a ferroelectric material MTiO3(M is Ca, Sr and Ba) with the same structure is added to form a solid solution together with the KNN to ensure that the material has excellent luminescence property; therefore, the multifunctional material has a blue light-excited photoluminescence characteristic and has the piezoelectric property and the ferroelectric property per se at the same time and has potential application prospect in the field of optoelectronic integration devices.

The invention discloses potassium sodium niobate based lead-free piezoelectric ceramic, which is characterized by having a chemical formula of [(Na0.5+xK0.5-x)0.94Li0.06][(Nb0.94Sb0.06)0.95Ta0.05]O3+ymol%TM+zmol%RE, wherein TM is MnO2, Fe2O3 or Ni2O3, RE is CeO2 or Nd2O3, the value of x is 0 or 0.01-0.11, the value of y is 0.02-0.12, and the value of z is 0-0.05. The invention further discloses a preparation method application of the ceramic. The ceramic disclosed by the invention maintains an excellent piezoelectric ferroelectric property, simultaneously has a high withstand voltage performance, has very good withstand voltage performance and temperature stability, and still maintains very high withstand voltage strength at the high temperature of 140 DEG C. The voltage withstand performance of the material is obviously superior to that of the commonly used barium strontium titanate (BST) based high-voltage ceramic capacitor material, and the withstand voltage value of the material at normal temperature is 1.7 times more than that of a BST material.

The invention discloses a high-hardness AlTiN/AlTiSiN multi-layer nano composite coating and a preparation process thereof, and belong to the technical field of composite coating preparation. The AlTiN/AlTiSiN film multi-layer nano composite coating is formed by overlaying an AlTiN layer and an AlTiSiN layer in a mutual alternated mode, the coating modulation period is 150-1000 nm, and the periodnumber is larger than to equal to 2. The composite coating is prepared by adopting an electric arc ion plating technology, and the preparation process comprises the following steps that a metal Ti target, an AlTi target and an AlTiSi target are selected, after glow cleaning and bombarding cleaning, a TiN transition layer is firstly deposited, finally nitrogen is introduced as a reaction gas, and the AlTi target and the AlTiSi target are alternately opened to deposit the composite coating according to the set modulation period. The prepared coating by using the preparation process is compact inorganizational structure, strong in binding force between the coating and a base body, high in hardness and strength and good in wear resistance.

The invention relates to a polycrystalline zirconia ceramic tooth post material and a preparation method thereof, belonging to the technical field of preparation of ceramic materials. It is characterized in that: the material contains zirconia ceramic powder as the initial raw material, a polymer binder, and a low-molecular additive, and the proportion thereof is: 80-90wt% of zirconia ceramic powder, 5-10wt% of polymer binder, 5-10wt% of low-molecular additives. The preparation method includes four steps of mixing and granulation, injection molding, thermal degreasing and sintering. The thermal degreasing temperature is 500-800°C, and the sintering temperature is 1350-1550°C. The organic binder system for injection molding of the present invention has good fluidity and high density of the molded green body, and the density of the ceramic product after sintering is greater than 6.0 g/cm ³ ;The sintering shrinkage and deformation of the formed green body are small, which ensures the dimensional accuracy of the product; the bending strength of the prepared ceramic tooth post is greater than 600MPa, and the fracture toughness is as high as 13MPa.m ^1/2 , elastic modulus 140MPa, Vickers hardness 1050 ~ 1200MPa. The preparation process has good repeatability and is convenient for industrialized production.

The invention provides a method for synthetizing leadless piezoelectric ceramic K0.65Na0.35NbO3 powder adopting a two-step hydrothermal method. Excess potassium hydroxide and excess sodium hydroxide are taken as a potassium source and a sodium source respectively and dissolved in deionized water; then niobium pentoxide is added into the solution respectively, and precursor solutions of KNbO3 and NaNbO3 can be synthesized respectively after even stirring; the precursor solutions are sealed in a hydrothermal kettle respectively, the hydrothermal kettle is placed in a thermostat for hydrothermal synthesis at a certain temperature, cooling to the room temperature is performed after the reaction, and powder obtained through the reaction is washed with deionized water for several times and dried finally. After a grinding process, KNbO3 powder and NaNbO3 powder are accurately weighed and mixed in the deionized water; microwave oscillation is performed after stirring; the mixture is poured into a hydrothermal reaction kettle and sealed for hydrothermal synthesis, cooling to the room temperature is performed after the reaction, and a mixed liquid obtained through the reaction is fully dried to obtain the powder. According to the method, the two-step hydrothermal method is adopted to synthetize the K0.65Na0.35NbO3 powder, the preparation technology is good in repeatability, the material component proportion is accurate, the powder is good in uniformity and high in purity, and crystal grains are complete in development and even in distribution.

A total nutrient peony stamen effervescent tablet comprises the following substances, by weight, 13.2 parts of a peony stamen extract, 2.7 parts of aspartame, 51 parts of a disintegrating agent, 27.8 parts of an acid source, 23.2 parts of an alkali source, 27.1 parts of lactose, 6 parts of PEG6000, a proper amount of a wetting agent and a proper amount of an adhesive. According to the effervescent tablet, peony stamens are prepared into the peony stamen total nutrient extract effervescent tablet, so that the resource waste of the peony stamens is avoided, a solid beverage which is convenient to carry and comprehensive and rich in nutrition is developed for people, and the peony stamen total nutrient extract effervescent tablet has higher social value and wide development prospect. Therefore, the peony stamen total nutrient extract is prepared from the peony stamens as a raw material through normal-temperature water extraction, vacuum concentration, ceramic membrane filtration, freeze drying, microwave sterilization and other processes, and through a single factor test and a Box-Behnken response method, the best ratio of auxiliary materials was optimized to develop a portable, ready-to-drink peony stamen total nutrient extract effervescent tablets solid beverage.

The invention relates to a preparation method of water-based strontium substituted hydroxyapatite colloidal liquid crystal. The method comprises the following steps that soluble strontium salt is dissolved in deionized water to form a solution A; soluble citrate is dissolved in deionized water to form a solution B; soluble phosphate is dissolved in deionized water to form a solution C; the solution B is dropwise added into the solution A; the mixed solution is stirred to form mixed liquid D; the solution C is dropwise added into the mixed liquid D; stirring is performed to form mixed liquid E;the mixed liquid E is poured into a sealed hydrothermal reactor; reaction is performed for 3 to 24h at 90 to 200 DEG C; then, natural cooling is performed to room temperature; centrifugation is performed by a high-speed centrifuge; obtained precipitates are alternately and centrifugally washed by deionized water and absolute ethyl alcohol; the washed precipitates are dispersed into the deionizedwater again; the pH is regulated; stable colloidal dispersion liquid is obtained; concentration is performed to the critical transition concentration or higher; the colloidal liquid crystal is obtained through preparation. The preparation method has the advantages that the raw materials are nontoxic and green; the resources are rich and can be easily obtained; the cost is low; the synthetic process is simple; the implementation is easy; the repeatability is good; the preparation method can be used in the fields of biomedical materials and the like.

The invention aims to provide a synthesis method of a frequency-adjustable wave-absorbing material, belongs to the technical field of electronic communication, and particularly relates to a preparation method of a frequency-adjustable SnO2/Sn/rGO wave-absorbing composite material, which comprises the following steps: preparing a nanoscale SnO2 material by a sol-gel method; finally, the SnO2/Sn/rGO composite material with the adjustable frequency is successfully prepared by controlling an interface group and a phase structure of the material through processes of hydrothermal treatment, different calcination temperatures and the like, and the frequency modulation mechanism of the SnO2/Sn/rGO composite material is researched. The composite material has adjustable wave absorbing performance when the thickness of the wave absorbing ring is 3mm, relaxation polarization loss is related to intrinsic carrier concentration and carrier migration, and the composite material plays a key role in microwave loss and a frequency modulation mechanism. And when the interface polarization range is (0.14-2.27), the microwave loss and low-frequency absorption of the composite material are relatively good.

The invention discloses a method for preparing an alkaline manganese oxide nano tube by room temperature corrosion. The method comprises the following steps of (1) preparing a Cu-Mn-O alloy ingot: mixing pure Cu and pure Mn at an atomic ratio of (18-20):(28-30), supplying partial air to an argon atmosphere, performing repeated smelting for more than three times, performing uniform mixing, and then performing cooling to obtain the Cu-Mn-O alloy ingot; (2) performing corrosion: placing the obtained Cu-Mn-O alloy ingot in a 0.03-0.07mol/L excessive hydrochloric acid solution, and performing the corrosion for 60-80h at a room temperature until the surface of the alloy ingot has no bubble overflow to obtain the corroded Cu-Mn-O alloy ingot; and (3) performing cleaning and drying: taking out the corroded Cu-Mn-O alloy ingot, sequentially soaking and cleaning the Cu-Mn-O alloy ingot by deionized water and alcohol, placing the Cu-Mn-O alloy ingot in the alcohol, performing ultrasonic dispersion treatment, and performing the drying to obtain an MnO(OH) micro-nano tube structure. According to the method, the MnO(OH) micro-nano tube is prepared under a room temperature condition by regulating and controlling a component and a structure of a master alloy and combining a simple room temperature corrosion method, and a novel technical approach is provided for preparing the MnO(OH) micro-nano tube.

The invention discloses a process method for synchronous heat treatment/magnetron sputtering of a TiO2 thin film, and belongs to the field of thin film preparation. The invention aims to solve the problem that subsequent high-temperature annealing treatment is needed when the TiO2 film is prepared by the existing magnetron sputtering technology. When the TiO2 film is deposited, the thermal radiation of a plasma source and the ion bombardment effect are utilized to synchronously realize the rapid high-temperature annealing treatment of the single-layer TiO2, the anode of the plasma source and the Ti target are positioned on the two sides of the substrate, and the bias value and the duration change along with the rotation position of the substrate. The sum of the values of the plasma source anode side bias voltage is higher than the Ti target side bias voltage. The deposited TiO2 film is of an anatase type crystal structure, and staphylococcus aureus is effectively inhibited.

The invention belongs to the technical field of biological detection.The invention discloses an avian influenza virus infection and vaccine immunity differential diagnosis detection card and a preparation method. The avian influenza virus infection and vaccine immunity differential diagnosis detection card comprises a shell and a sample diluent used in cooperation with the shell, and a test strip is assembled in the shell and comprises a PVC bottom plate; wherein a sample pad, a marking pad, a coating film and a water absorption pad are pasted on the PVC bottom plate, and the kit is characterized in that the marking pad is a glass cellulose film and is coated with a coupling marker of a mouse anti-chicken IgG monoclonal antibody and latex microspheres; the coating membrane is a nitrocellulose membrane, and a detection line coated with purified avian influenza NS1 protein and a quality control line coated with purified recombinant streptococcus G protein are coated on the coating membrane. The kit can identify and diagnose antibodies generated by avian influenza virus infection and vaccine immunization, has good specificity and convenience, and can well identify avian influenza infected chicken flocks.

The SiC/PyC nanowire reinforced Al2O3 high-temperature-resistant wave-absorbing ceramic is composed of an Al2O3 porous ceramic matrix, a graphene interface and SiC/PyC nanowires, the Al2O3 porous ceramic is adopted as the matrix, the graphene interface and the SiC/PyC nanowires are deposited on a framework of the Al2O3 porous ceramic to form a porous structure type wave-absorbing material, and the SiC/PyC nanowire reinforced Al2O3 high-temperature-resistant wave-absorbing ceramic has the characteristics of light weight and high strength, can stably serve in a high-temperature environment, and can be used as a high-temperature-resistant wave-absorbing material. The high-temperature wave-absorbing composite material has the advantages that high-temperature wave-absorbing characteristic application is achieved, electromagnetic parameters of the composite material are optimized due to introduction of the graphene interface and the SiC/PyC nanowires, good impedance matching and attenuation coefficients can be obtained, and accordingly excellent wave-absorbing performance is obtained. Besides, Al2O3 porous ceramic is used for providing a porous structure, a graphene interface and SiC/PyC nanowires are introduced through a chemical vapor deposition method, the interface bonding force is high, the chemical purity is high, the preparation process is good in repeatability, and a new thought can be provided for large-scale production of the three-dimensional structure composite wave-absorbing material.