4results about How to "Sinter stable" patented technology

The utility model relates to the technical field of lithium battery positive electrode materials, and discloses a pretreatment sagger and sintering equipment. The lithium layer is arranged at the bottom of the sagger body and is suitable for preventing lithium from being absorbed by the sagger body in the sintering process; the lithium layer is composed of one of lithium carbonate, lithium hydroxide or lithium oxide and is fixed to the bottom of the sagger body. The sintering equipment comprises a sintering furnace; the saggar bearing frame is arranged in the sintering furnace and used for fixing and arranging the multiple pretreatment saggars. The gas circulation system is used for introducing inert gas or reducing gas into the furnace in the sintering process so as to prevent lithium from being oxidized. The lithium layer can reduce direct contact between the sagger body and lithium, so that corrosion and abrasion of the sagger are reduced, and the service life of the sagger is prolonged.

The application discloses a preparation method of hydrogenated aldehyde ketone resin without free formaldehyde, belongs to the technical field of aldehyde ketone resin synthesis, and aims to solve the technical problems of high free formaldehyde content, and further improved hydroxyl value stability and transparency in the hydrogenated aldehyde ketone resin in the prior art, and specifically comprises the following steps: under the protection of an inert gas atmosphere, phenylacetone, polyformaldehyde and a solvent are mixed and stirred, the reaction system is heated to 60-75 DEG C, and an inorganic alkali is added into the reaction system. The application is characterized in that the basic aldehyde ketone resin solution prepared by condensation of polyformaldehyde and phenylacetone in a water-free environment with a nickel catalyst is catalytically hydrogenated, not only the hydrogenated aldehyde ketone resin with stable hydroxyl value and extremely low colority is effectively obtained, but also the free formaldehyde content in the hydrogenated aldehyde ketone resin is effectively reduced, and the wide applicability of the hydrogenated aldehyde ketone resin in high-end coatings, adhesives and electronic materials is improved.

The present application relates to the technical field of metallurgy, and discloses a kind of iron ore powder sintering reaction performance evaluation method and system, to solve the problems of fragmentation, strong experimental dependence, unable to measure key parameters and poor dynamic adaptability of existing method, scheme mainly includes: obtaining the chemical composition of the iron ore powder to be evaluated, and normalizing processing;Using the Equilib module of FactSage, the results under different temperature conditions are calculated when the reaction equilibrium is obtained;Extract liquid phase production, liquid phase chemical composition and reaction enthalpy data;And using the Viscosity module of FactSage, the liquid phase viscosity under different temperature conditions is calculated;Select the liquid phase production, reaction enthalpy and liquid phase viscosity under a certain temperature as evaluation parameters, carry out vector normalization processing and set weight, use TOPSIS multi-criteria decision method, respectively calculate the relative closeness of each group of evaluation parameters;Relative closeness is used as the evaluation index of iron ore powder sintering reaction performance.The present application improves the accuracy and efficiency of sintering reaction performance evaluation.

This invention proposes a spherical polylactic acid (PLA) powder with a wide sintering window, its preparation method, and its application. The preparation method includes the following steps: S1, mixing a poor solvent and PLA granules, adding the mixture to a reaction vessel, stirring, first heating, then holding at that temperature; S2, then cooling to 100-118°C, holding at that temperature for 30-60 minutes; S3, removing the product, washing and drying the product to obtain the spherical PLA powder. This invention is based on thermally induced phase separation, adding a spheroidization step to increase the crystallinity and sphericity of the PLA powder. The prepared spherical PLA powder has a particle size distribution of 10-120 μm and a bulk density of 0.3-0.45 g / cm³. 3 The powder possesses high fluidity, a wide sintering window, and excellent sintering performance, while retaining the excellent greenness and biocompatibility of polylactic acid. PLA parts formed by LPBF printing using the spherical PLA powder prepared in this invention exhibit good mechanical properties.