6results about How to "Microstructural stability" patented technology

The application discloses a kind of enhanced Sn-Ag-Cu low silver lead-free solder and its preparation method and application, and the specific components of enhanced technical scheme are as follows: Cu: 0.5%~1.0%, Ag: 0.1%~1.0%, La: 0.002%~1.2%, Ge: 0.002%~1.3%, Co: 0.001%~1.2%, and the rest is Sn, calculated by mass percentage. Under the joint action of the added elements, the microstructure of the solder can be improved, thereby effectively enhancing the creep resistance of the solder, greatly improving the fatigue life of the solder at high temperature, and significantly improving the reliability of the solder.

The invention discloses a nitrogen-doped silicon-oxygen-carbon negative electrode material of a lithium ion battery as well as a preparation method and application of the nitrogen-doped silicon-oxygen-carbon negative electrode material, and belongs to the technical field of negative electrode materials of lithium ion batteries. The preparation method of the nitrogen-doped silicon-oxygen-carbon material comprises the following steps: carrying out acidic hydrolytic condensation reaction on gamma-methacryloxypropyltrimethoxysilane, and carrying out rotary evaporation, washing and drying to obtain a polysiloxane precursor; and performing high-temperature pyrolysis on the polysiloxane precursor in a nitrogen-containing atmosphere to obtain the nitrogen-doped silicon-oxygen-carbon negative electrode material. According to the nitrogen-doped silicon-oxygen-carbon negative electrode material for the lithium ion battery, the content of nitrogen in silicon-oxygen-carbon is controlled by adjusting conditions such as pyrolysis atmosphere, pyrolysis temperature and pyrolysis time, so that lithium ion storage sites are innovatively enriched from the atomic scale, and the ion and electron transmission capability of the silicon-oxygen-carbon material is improved; therefore, the electrochemical properties such as the first-circle coulombic efficiency, the reversible capacity, the rate capability and the long cycle stability of the silicon-oxygen-carbon material are remarkably improved.

The application discloses antibacterial and bacteriostatic polyester non-woven fabric and a preparation method thereof, and belongs to the technical field of polyester non-woven fabric. The method comprises the following steps: taking the polyester non-woven fabric, carrying out alkali immersion, acid immersion and polydopamine coating to obtain pretreated polyester non-woven fabric; dipping the pretreated polyester non-woven fabric in an antibacterial liquid for finishing and baking to obtain the antibacterial and bacteriostatic polyester non-woven fabric; the antibacterial liquid is composed of a tannic acid solution, a hydrosulfite and antibacterial particles; the antibacterial particles are obtained by compounding and calcining graphene oxide / KH550 modified nano silicon dioxide and zinc-doped titanium dioxide sol to obtain r-GO / SiO2 / Zn-TiO2, and then in-situ reducing silver ions by using bamboo shoot extract; and the antibacterial and bacteriostatic performance of the polyester non-woven fabric is improved.

This invention discloses a high-temperature resistant and creep-resistant asbestos-free composite sealing board and its preparation method. The board is made from raw materials comprising 30-50 parts inorganic fibers, 10-20 parts high-temperature resistant organic fibers, 25-45 parts high-temperature resistant functional fillers, and 8-18 parts composite binder. The composite binder is pre-mixed from liquid phenolic resin and nano-silica sol at a dry weight ratio of 1:(0.5-2). The board has a localized inorganic reinforcing network formed by the accumulation and curing of nano-silica sol in the pores and interfaces of the fiber network. The preparation method includes: fiber dispersion and pulping, composite slurry preparation, wet paper forming, supplementary impregnation and pre-curing, segmented hot pressing curing, and post-heat treatment. This invention, by combining an organic-inorganic composite bonding system with a specific process, significantly improves the board's resistance to compression creep and sealing durability at high temperatures, solving the technical problem of easy loosening and leakage of traditional asbestos-free sealing materials under extreme conditions.

This invention belongs to the field of piezoelectric materials and discloses a lead nickel tungstate-lead zirconate titanate piezoelectric ceramic and its preparation method. The general chemical formula of the lead nickel tungstate-lead zirconate titanate piezoelectric ceramic of this invention is: xPb(Ni 1 / 2 W 1 / 2 )O3-yPbZrO3-(1-x-y)PbTiO3+zwt%MnO2; where, 0.05

The invention relates to the field of ceramic materials, in particular to a preparation method of a high-thermal-conductivity aluminum nitride tape-casting green body and a ceramic chip thereof, and the high-thermal-conductivity aluminum nitride tape-casting green body is prepared from the following raw materials in parts by weight: 100 parts of aluminum nitride powder, 1.5-3.5 parts of a dispersing agent, 8-12 parts of a binder, 3-6 parts of a plasticizer, 1-5 parts of a sintering aid and 80-100 parts of water. According to the invention, due to the low hydrolytic property of the slurry, the uniform distribution of the sintering aid and the optimized sintering schedule, the thermal conductivity of the obtained ceramic wafer is stabilized at 200W / (m.K) or above, the ceramic wafer has a uniform and compact microstructure, the bending strength can reach 450MPa or above, and the requirement of high-end application on mechanical reliability is met.