30results about How to "Slurry stabilization" patented technology

The invention relates to the technical field of ceramic materials, and provides a high thermal conductivity aluminum nitride ceramic and a preparation method thereof. The preparation method includes the following steps: (1) primary ball milling; (2) calcination; (3) secondary ball milling; (4) (5) Tape forming; (6) Isostatic pressing; (7) Debinding; (8) Hot pressing and sintering to obtain aluminum nitride ceramics with a thermal conductivity of 200-230W / (m·K ), the flexural strength is 470-540MPa, and the bulk density is 3.3-3.5g / cm, which solves the problem that the existing aluminum nitride ceramics only have outstanding performance in one aspect such as thermal conductivity and strength, and cannot take into account all aspects of performance at the same time. question.

The invention discloses an ultrafine inorganic grouting material for tunnel inverted arches. The grouting material comprises, by mass, 75-90% of an ultrafine cementing material, 5-20% of a mineral filler, 2.5-7.5% of a composite expansion agent, 0.04-0.08% of a fluid volume stabilizer, 0.5-1.5% of a film forming modifier, 0.4-0.8% of a water reducer, 0.02-0.05% of a defoamer, 0.1-0.4% of a dispersant, 0.05-0.1% of an anti-seepage water repellent and 1-5% of a nano-reinforcing component. Above components are uniformly mixed, water is added according to a water-cement ratio of 0.25-0.30, and stirring is performed to obtain the grouting material which can be used for grouting reinforcement portions and defect parts of the tunnel inverted arches. The inorganic grouting material obtained in theinvention is suitable for repairing and stabilizing defects and dangerous rock bodies of tunnel inverted arches at 5-35 DEG C, has the advantages of high fluidity, high bonding strength, no shrinkage, good impermeability and good durability, and is suitable for being promoted and applied.

The invention discloses a preparation method of a molecular sieve type monolithic catalyst. The preparation method of the molecular sieve type monolithic catalyst has the advantage that the purposes of improving the activity of the catalyst and widening the temperature window of the catalyst are achieved by combining a plurality of molecular sieve active coatings on a catalyst due to the adoption of different activities of different molecular sieve type catalysts in NOx selective catalytic reduction reaction. The preparation method of the molecular sieve type monolithic catalyst comprises the following steps: preparing Fe modification ZSM-5 molecular sieves and NH4-ZSM-5 molecular sieves into corresponding slurries, then respectively coating the slurries on one end of a cordierite honeycomb ceramic carrier to prepare a molecular sieve type monolithic catalyst applied to selective catalytic reduction of nitric oxides. The catalyst prepared by the method has high activity of selective catalytic reduction of nitric oxides; the performance of the catalyst is superior to that of the molecular sieve type monolithic catalyst which only takes the Fe modification ZSM-5 molecular sieves and the NH4-ZSM-5 molecular sieves as active coatings; the conversation rate of NOx in a temperature zone of 190-490 DEG C can reach over 80%; and the catalyst is simple in preparation method and relatively low in production cost.

The invention discloses a cementing method with physical foamed cement, which comprises the steps: the stock solution of a foaming agent and clear water are diluted according to the weight proportion of 1: 10 to 30, stirred evenly, and provided with compressed air with the pressure of 0.2 to 0.6MPa through an air compressor; the pumping rate of a metering pump is set, diluted stock solution of the foaming agent and the compressed air are simultaneously provided for a foam generator in unit time of 20 to 45min so as to cause the stock solution of the foaming agent and the compressed air to form foamed media in the foam generator, the foamed media is input into a cement pump by the driving of the compressed air, and mixed with cement slurry according to the weight proportion of 1: 10 to 30,and finally pumped into a well. The invention changes the technique for preparing cement by the existing chemical foaming method, the foaming process changes into ground foaming from the original well foaming, thus leading the foaming media and the cement mud to be more evenly, the slurry to be stable and the density to be small; and the cementing method is easy to adjust, control and detect.

The present invention is a negative-electrode active material comprising negative-electrode active material particles, the negative-electrode active material being characterized in that the negative-electrode active material particles comprise silicon compound particles each containing an oxygen-containing silicon compound, each of the silicon compound particles contains at least one component selected from Li2SiO3 and Li2Si2O5, and each of the silicon compound particles has a peak P attributed to a Li silicate at a position around 1847 eV and also has a peak Q that is gentler than the peak P at a position around 1851 to 1852 eV in an Si K-edge spectrum obtained from an XANES spectrum. It is possible to provide a negative-electrode active material which enables the increase in a battery capacity associated with the improvement in initial efficiency while stabilizing a slurry when used as a negative-electrode active material for a secondary battery.