6results about How to "Improve sintering stability" patented technology

The present invention relates to a special-shaped ruthenium dioxide and a preparation method thereof and a resistor paste. The preparation steps of the special-shaped ruthenium dioxide of the present invention are: dissolving bismuth oxide in an acidic solution, adding ruthenate and a reducing solution to obtain a black precipitate; drying the black precipitate and then performing a heat treatment, washing it with an acidic solution after the heat treatment, and then washing it with water, and drying it to obtain the special-shaped ruthenium dioxide. In the process of preparing ruthenium dioxide by a reduction method, the present invention adds bismuth oxide. During the secondary heat treatment, bismuth oxide promotes the specialization of ruthenium dioxide, that is, when ruthenium dioxide is heat-treated, bismuth oxide makes the growth rate of different parts of the surface of ruthenium dioxide different, and forms a cone-thorn structure on the surface of ruthenium dioxide. Ruthenium dioxide of this shape has a larger specific surface area. When ruthenium dioxide of this shape is added to the resistor paste, the compactness of the conductive film can be ensured during the sintering process, the porosity can be reduced, the sintering stability of the resistor paste can be improved, and the resistor paste has excellent performance.

The invention discloses a carbon ceramic closing resistor for a high-voltage circuit breaker and a preparation method of the carbon ceramic closing resistor, and belongs to the technical field of power elements. The problems of poor resistor compactness, non-uniform performance, insufficient mechanical property and the like caused by high pressing and sintering difficulty, process instability and high and non-uniform resistor porosity of the carbon ceramic resistor are solved. The preparation process of the resistor comprises the following steps: by taking aluminum oxide and quartz as ceramic phases, presintered kaolin, mullite and potassium feldspar as clay phases and carbon black or graphite as conductive phases, pre-coating the ceramic phases with the clay phases, carrying out vacuum calcination on pre-coated powder, mixing the pre-coated powder with the secondarily added clay phases and the conductive phases, carrying out spray granulation, pressing a green body, sintering and spraying. And obtaining the carbon ceramic closing resistor. According to the invention, the kaolin is pre-sintered, and the clay phase is pre-coated with the ceramic phase, so that the subsequent blank pressing uniformity and density are increased, the structural defects of the carbon ceramic resistor are reduced, and in combination with the spark plasma sintering technology, the batch rapid production of the resistor can be realized.

The present invention discloses a multi-energy field sintering device and method for high-temperature alloy micro-sintered parts, belonging to the field of powder metallurgy processing technology, in order to solve the problems existing in the current micro-sintered parts, especially the micro-gear manufacturing method, such as the difficulty in positioning the workpiece, the increase in friction resistance under high temperature environment, the difficulty in demoulding, the loss of mechanical integrity caused by the change of material microstructure, the aggravation of mold wear, and the scale effect. The present invention includes a die assembly, an insulating assembly, an internal insulating sintering mold, a fixed mold, a temperature control system, a conductive voltage head assembly and a vibration device. During sintering, the second phase particle precipitation promotion stage, the recrystallization promotion stage, the uniform growth stage of recrystallized particles, the core toughening stage and the tooth surface hardening stage are carried out. The production efficiency of micro-sintered parts is greatly improved, and the forming and characterization integrated manufacturing of micro-sintered parts is realized, and the peripheral structure performance of the obtained sintered parts is greatly improved.

This invention relates to the field of temperature control technology for experimental electric heating furnaces, and discloses a temperature control system and method for such furnaces. The system includes a material composition acquisition and judgment module and a temperature preset module, a three-dimensional temperature monitoring point array module, a graded temperature control execution module, and a main control module. By acquiring data on the composition content of the raw materials, a prediction model predicts the target sintering temperature curve. Simultaneously, temperature data is acquired through the main and auxiliary monitoring arrays, generating a three-dimensional temperature field thermogram with temperature change rates. The main control module employs a fuzzy adaptive PID algorithm to compare the changing trends of the target sintering temperature curve and the three-dimensional temperature field thermogram, generating a control strategy and sending it to the graded temperature control execution module. Point-to-point precise temperature control is achieved through temperature control components corresponding to the auxiliary monitoring array. This system ensures that the temperature field inside the furnace closely matches the target sintering temperature curve, improving the sintering effect.

The utility model relates to the green body sintering support technical field, specifically disclose green body anti -deformation support's vertical sintering support, including the protection frame, it includes protection frame body and sets up a plurality of placing groove in protection frame body, sets up the closed structure at protection frame body opening, lock catch structure is used for fixing closed structure at protection frame body opening, placing frame sets up in protection frame body, and it includes placing frame body and sets up a plurality of limit rods at placing frame body top, limit rod both sides are equipped with limit slot, limit rod both ends are connected extension block, the whole in the utility model adopts vertical design, and placing frame is easy to place into protection frame body, and can choose the placing frame of different layers according to green body height, and the cooperation of placing mould and placing frame can support and hang in the air to green body, improve sintering stability, the distance between limit rod on placing frame is adjustable, and can adapt different placing mould according to sintering green body.

The invention provides carbon nanotube composite silver paste and a preparation method thereof. The carbon nanotube composite silver paste comprises the following components in parts by weight: 1-3 parts of carbon nanotube paste, 80-85 parts of silver powder, 1.2-2.5 parts of aluminum powder, 2-8 parts of glass powder, 7-10 parts of an organic carrier and 1-2.4 parts of a first solvent, the carbon nano tube slurry is prepared by mixing a carbon nano tube with a second solvent and a dispersing agent, and then carrying out tank milling, sanding and convection homogenization; and the carbon nano tube slurry comprises the following components in percentage by weight: 1-5% of the carbon nano tube, 94.5-98.5% of the second solvent and 0.15-1.5% of the dispersing agent. The carbon nanotube composite silver paste provided by the invention not only can solve the problems that the traditional carbon-silver composite paste is difficult to print and easy to block a net, but also can improve the battery performance to a certain extent while reducing the production cost of the silver paste.