51results about How to "Meet density requirements" patented technology

The invention relates to a nonplanar microneedle array and a manufacturing method thereof. The nonplanar microneedle array comprises coplanar microneedles and a substrate, wherein more than two coplanar microneedles are assembled on the substrate, the substrate is a substrate provided with a clamp, which comprises a substrate body and the clamp, the substrate body is provided with at least two positioning raised lines, the clamp is provided with clamping grooves in one-to-one correspondence with the positioning raised lines, the clamp is installed on the substrate body, the positioning raised lines are embedded in the clamping grooves, a clamping interval is left between each clamping groove and each positioning raised line, a bottom seat of the coplanar microneedles is placed in the clamping intervals, and an elastic element which pushes the clamp to horizontally move towards one shrink side of the clamping intervals is arranged between the clamp and the substrate body so as to clamp the bottom seat of the coplanar microneedles. The nonplanar microneedle array has the advantages that shapes of needle tips of the coplanar microneedles are easy to control, the needle tips are good in quality, and the microneedle array assembled by arranging a plurality of the coplanar microneedles side by side not only can guarantee the needle tips, needle shapes and the needle length, but also can meet the requirement for the density of the needle tips.

The invention discloses a high-density iridium alloy billet and a preparation method of the high-density iridium alloy billet. The high-density iridium alloy billet contains 0.1%-0.5% of tungsten by weight, 40ppm-80ppm of thorium, and the balance of iridium and unavoidable impurities. The preparation method includes the steps as follows: according to the requirement for the components of the final iridium alloy billet, conducting high energy activation on tungsten powder, tungsten-thorium alloy powder and iridium powder by adopting a high-energy ball mill, uniformly mixing the tungsten powder, the tungsten-thorium alloy powder and the iridium powder, then placing the mixed powder into a vacuum oven to dry so as to obtain a high-energy activated mixed powder, later pressing and moulding the high-energy activated mixed powder in a mould pressing or cold isostatic pressing way to botain a powder pressed billet, then placing the powder pressed billet in a high-temperature sintering furnace to sinter, and cooling along with the furnace to obtain the high-density iridium alloy billet. In the invention, high-energy ball milling activation and mixing in batches are adopted, thus achievingthe uniform distribution of trace thorium in the alloy powder and reducing sintering activation energy; and the high-density iridium alloy billet which meets the requirements of an iridium alloy applying piece and follow-up hot working on the density of the billet is prepared, and the relative density achieves above 95%.

The invention relates to a low temperature rapid hardening grouting material for an offshore oil well. The low temperature rapid hardening grouting material for the offshore oil well comprises the following raw materials in parts by weight: 2,000 parts of gel materials, 950-965 parts of inorganic mineral active materials, 25-35 parts of retarders, 5-10 parts of anti-freezing ingredients, 3-5 parts of high efficiency slushing agents, and 0.1-0.3 part of defoaming agents, wherein the gel materials are quick-hardening sulphate aluminium cement and oil well cement; the mass ratio of the quick-hardening sulphate aluminium cement and oil well cement is 5:5-8:2. The invention also provides a preparation method thereof. The grouting material is suitable for construction under a well cementation low-temperature environment, slurry can maintain better mobility and is high in early strength, the slurry is full without shrinkage, the long-term strength is high, and the well cementation construction time and the underground grouting environment parameter requirement are effectively ensured.

The invention discloses a method for rapidly forming an amine group on the surface of a material, a medical material with a surface loaded with a high-density amine group and an application of the medical material, and relates to the technical field of medical materials. The method for rapidly forming the amine group on the surface of the material comprises the steps that the to-be-loaded materialis subjected to standing in an alkaline solution to obtain an alkali-activated material; the alkali-activated material reacts with a PAMAM-NH2 solution for 5min-24h. The medical material with the surface loaded with the high-density amine group comprises the to-be-loaded material, the surface of the to-be-loaded material is loaded with PAMAM-NH2, and the medical material can be prepared through the method. The preparation method is simple and easy to operate, the reaction time is short, the density of the amine groups on the surface of the material can be effectively controlled, and the requirements of different amine group densities on the surface of the material can be met.