12 results about "Silver-palladium alloy" patented technology

The invention discloses an NTC (Negative Temperature Coefficient) thermistor and a preparation method thereof, the NTC thermistor comprises a ceramic substrate and electrodes, the electrodes are attached to two ends of the ceramic substrate, the electrodes are connected with leads, a glass packaging layer is arranged on the outer side of the ceramic substrate, and the ceramic substrate and the electrodes are wrapped by the glass packaging layer; the ceramic matrix is prepared from the following raw materials in percentage by weight: 40%-60% of manganese oxide, 10%-20% of cobalt oxide, 20%-30% of nickel oxide, 3%-12% of copper oxide and 1%-5% of doped element oxide; the electrode is a silver-palladium alloy electrode, and the mass ratio of silver to palladium is 7: 3-9: 1. By accurately controlling the raw material proportion and the preparation process of the ceramic matrix, the thermistor has a relatively high response speed and can timely and accurately reflect the rapid change of the temperature. And meanwhile, the thermistor has a wider resistance-temperature characteristic range and higher stability, and is suitable for the field of high-precision temperature measurement and control. And the oxidation resistance and the stability of the improved thermistor are improved.

A heater assembly (100) for an aerosol generating system (200), wherein the heater assembly (100) comprises a resistance heating element (102) for vaporizing a liquid aerosol generating substrate and a porous body (104) for transporting the liquid aerosol generating substrate to the resistance heating element (102), the porous body (104) having a liquid absorption surface (104a) and a heating surface (104b), the resistance heating element (102) being located on the heating surface (104b) of the ceramic porous body (104), and the resistance heating element (102) containing a silver-palladium alloy consisting of 53 to 73 weight percent silver, 7 to 23 weight percent palladium, 1 to 7 weight percent carbon, 3 to 17 weight percent oxygen, and impurities.

The invention discloses a silver-palladium alloy nanowire and a preparation method and application thereof, and belongs to the technical field of nano alloy materials. The preparation method comprises the following steps: (1) adding an aqueous solution of hexadecyl trimethyl ammonium bromide and an aqueous solution of dopamine hydrochloride into an aqueous solution of silver nanowires, uniformly stirring, dropwise adding an aqueous solution of sodium chloropalladate, and continuously stirring until the reaction is completed to obtain a reaction product; and (2) carrying out centrifugal washing on the reaction product to obtain the silver-palladium alloy nanowire. The prepared silver-palladium alloy nanowire material is used for catalytic reduction of 4-nitrophenol, verification of a photothermal effect and glutathione level detection, so that the application of the silver-palladium alloy nanowire material in the field of catalysis is effectively expanded; and a brand new nano-alloy material and an application approach are provided for high-sensitivity and high-selectivity detection of glutathione level due to the exertion of a photothermal effect.

The invention relates to the technical field of building engineering construction, in particular to a cyanide-free silver-palladium alloy plating stabilizer, a preparation device, a preparation method and application. The stabilizer prepared by mixing 3-aminomethyl-tetrahydrofuran and 2-amino-5-chloro-N, 3-dimethyl benzamide is added into a silver-palladium alloy electroplating solution; the self-decomposition of the plating solution can be inhibited on the basis of not changing the performance of the original plating layer; the coating quality is improved; in the electroplating process, the stabilizing agent can promote the combination between the plating layer and the base body through a certain mechanism, so that the plating layer is more firmly attached to the base body. The method is of great significance in improving the overall performance and prolonging the service life of electroplated products. The performance parameters of viscosity, surface tension and the like of the plating solution can be adjusted by the stabilizer according to specific requirements so as to adapt to different electroplating processes and base materials.

A multilayer ceramic capacitor includes a multilayer body including dielectric layers made of ceramic and stacked together, and inner electrodes arranged along multiple interfaces between the dielectric layers, with each inner electrode extending along a respective interface. The inner electrodes include a silver / palladium alloy as a conductive material and also include at least one of (Ag0.7, Pd0.3)TiO3, NaTiO3, and EuTiO3.

The invention relates to a preparation method of a silver-palladium alloy target material ceramic element electrode, which comprises the following steps: step S1, preparation of a bonding layer: firstly, preparing a ceramic substrate, adopting a nickel-chromium alloy target material for sputtering, forming a nickel-chromium bonding layer on the ceramic substrate, and controlling the sputtering power range to be 500-700W; s2, a conductive layer is manufactured, sputtering is conducted on the nickel-chromium bonding layer through a silver-palladium alloy target material, the conductive layer is formed, the sputtering power range is controlled to be 300-500 W, and an electrode is obtained; and S3, heat treatment is conducted, specifically, in the sputtering process of the step S1 or in the sputtering process of the step S2 or after the whole sputtering process is finished, heating treatment is conducted on the ceramic base body, and the heat treatment temperature range is 50-80 DEG C. The method has the advantages that through the synergistic effect of the nickel-chromium bonding layer, the silver-palladium conducting layer with specific components and the optimized heat treatment technology, the heat conductivity of the ceramic base body is improved, and the heat conductivity of the ceramic base body is improved. The preparation of the ceramic element electrode with low cost, high weldability and strong binding force is realized.

The application discloses a high-temperature heat treatment method of silver-palladium alloy powder, which comprises the following steps: weighing superfine silver-palladium powder and pouring it into deionized water for hydrothermal reaction, preparing a dispersant and a coating agent solution, adding the solution into a hydrothermal reaction kettle, heating and keeping the hydrothermal reaction kettle, and carrying out hydrothermal coating; then, the solution in the hydrothermal reaction kettle is centrifugally separated into solid and liquid phases, washed, dried, and crushed to obtain coated silver-palladium alloy powder; the silver-palladium alloy powder and salt are mixed according to a required proportion, and then placed in a muffle furnace and heated to a required temperature; after keeping the temperature, a high-temperature heat treatment silver-palladium alloy powder and salt mixture is obtained; finally, the mixture is washed, dried, and crushed to obtain the high-temperature heat treatment silver-palladium alloy powder. The application can prepare the silver-palladium alloy powder with a size of 1.5-2.5 microns and a tap density of 4.2-6.0 g / cm 3 .

The application provides a preparation method of low-resistance flaky silver-palladium alloy powder and conductive paste, and belongs to the field of preparation of precious metal powder materials. The preparation method of low-resistance flaky silver-palladium alloy powder comprises the following steps: (1) mixing a silver salt solution, a palladium salt solution and a reducing agent solution to perform a reduction reaction, so as to obtain silver-palladium alloy powder; (2) mixing the silver-palladium alloy powder, a dispersion liquid and a ball-milling dispersant, and then performing ball-milling, so as to obtain flaky silver-palladium alloy powder; the milling balls used in the ball-milling include one or more of steel balls, zirconium dioxide balls and agate balls. The flaky silver-palladium alloy powder is prepared by adopting the mode of "alloying first and then ball-milling", the two key links of "alloying" and "flaky" can be independently optimized, the uniformity and the controllability of the morphology of the powder are improved at the atomic level, the prepared flaky silver-palladium alloy powder has good dispersibility and a smooth surface, and has a resistance superior to that of spherical alloy powder, spherical mixed powder and flaky mixed powder.

The invention discloses silver-palladium alloy-barium titanate core-shell structure nano-powder which comprises silver-palladium alloy nano-particles serving as a core layer and a crystalline state barium titanate coating layer serving as a shell layer, the particle size of the core layer is 300-800 nm, the expression is AgxPd1-x, x is larger than or equal to 0.4 and smaller than or equal to 0.9, and the thickness of the shell layer is 10-100 nm; the preparation method sequentially comprises the steps of silver-palladium alloy nano powder surface pretreatment, barium titanate precursor solution preparation, gradient heating hydrolysis coating, low-temperature solvothermal crystallization, product post-treatment and reaction liquid centrifugal separation. Alloy powder is dispersed through a non-aqueous solvent, and interface non-diffusion coating is achieved through chelating agent assisted gradient heating hydrolysis in combination with a low-temperature high-pressure hydrothermal reaction; the obtained powder is good in crystallinity and uniform in coating at low temperature; according to the invention, the technical barrier of low-temperature high-quality synthesis of the metal-ceramic core-shell material is overcome, and core material support is provided for miniaturized high-reliability electronic devices.

The invention provides a silver-palladium bonding wire and a preparation method and application thereof, and relates to the technical field of bonding wires. Specifically, the method comprises the following steps that raw materials of silver and palladium are subjected to vacuum induction melting, and silver-palladium alloy is obtained; a silver-palladium wire rod with the diameter of 0.1-6 mm is obtained through continuous casting and first drawing; then acid pickling treatment, ultrasonic cleaning and drying treatment are conducted in sequence; performing vacuum heat treatment at a specific temperature to obtain a wire rod covered with a palladium layer on the surface; and finally, carrying out second drawing to obtain the silver-palladium bonding wire with the diameter of 0.02-0.5 mm. According to the method, the pure palladium layer with good binding force can be formed on the surface of the silver-palladium alloy through vacuum heat treatment; and the preparation method of the silver-palladium bonding wire, which is simple in process, high in yield, excellent in quality and green and environment-friendly, is obtained by combining surface treatment with two times of drawing processes, and has an important value for promoting the development of an electronic packaging technology.

The invention provides a preparation method of silver-palladium alloy powder, and belongs to the field of precious metal alloy powder material preparation. The invention provides a preparation method of silver-palladium alloy powder, which comprises the following steps: mixing a reducing agent, a lubricating agent, a palladium nitrate solution, silver nitrate and water for reduction reaction to obtain the silver-palladium alloy powder, the lubricant is a stearic acid lubricant; the reducing agent is ascorbic acid. According to the preparation method, the lubricant is used for replacing a traditional surfactant to serve as a dispersing agent in reaction to prepare the powder, and the variety of the reducing agent is adjusted, so that the obtained powder has monodispersity, particles are spherical, smooth in surface, narrow in particle size distribution and high in alloying degree, and the powder particles are extremely easy to settle and convenient to wash and separate; therefore, the production process is simple, low in cost, short in period and suitable for mass production.

A heater assembly (100) for an aerosol-generating system (200), the heater assembly (100) comprising: a resistive heating element (102) for vaporizing a liquid aerosol-generating substrate; and a porous body (104) for delivering a liquid aerosol-generating substrate to a resistive heating element (102), the porous body (104) having a liquid absorbing surface (104a) and a heating surface (104b), the resistive heating element (102) being located on the heating surface (104b) of the porous ceramic body (104), where the resistive heating element (102) comprises a silver-palladium alloy, the silver-palladium alloy is composed of 53 wt% to 73 wt% of silver, 7 wt% to 23 wt% of palladium, 1 wt% to 7 wt% of carbon, 3 wt% to 17 wt% of oxygen, and impurities.