6results about How to "Improve compact strength" patented technology

A powder isostatic pressing method, characterized in that it includes the following steps: a first step, loading a mixed powder or a compression-molded soft blank into a sheathing mold, wherein the mixed powder or the compression-molded soft blank is a hard alloy or metal ceramic material added with 1-4wt.% paraffin wax; placing the sheathing mold in a vacuum box and vacuum heating it, the heating temperature is 40-60°C, and the insulation time is 20-60min; on the other hand, loading resin into a metal mold, and heating the metal mold until the resin inside it is completely softened; a second step, placing the sheathing mold into the metal mold, and the sheathing mold is immersed in the resin in the metal mold; a third step, using a press to drive the punch of the metal mold, so that the punch enters the mold cavity of the metal mold to apply a pressure of 20-100MPa to the resin molten liquid, maintaining the pressure for 0-30S and then releasing the pressure, taking out the sheathing mold, and cutting the sheathing mold to obtain a formed green sheet.

The invention relates to a construction method of a reinforcing and upgrading structure of a rainwater falling pipeline undisturbed utilization carriageway inspection well, a rubber pad and a reinforced compaction well lid are adopted to cover the inspection well, and the compaction strength of roadbed soil around the inspection well is improved; heightened cement soil is adopted to reinforce a roadbed and raise a steel fiber concrete shaft structure, the overall strength of the inspection well and surrounding soil is improved, and sedimentation of the inspection well and the surrounding soil is reduced; the upper portion of the inspection well is subjected to backfilling treatment in the roadbed compaction process by adopting an easily-excavated discrete material, and the secondary excavation construction difficulty of the inspection well is improved; the upper part of the inspection well is treated by adopting a prefabricated well seat and a well periphery butt strap structure, so that the influence of roadbed settlement on the inspection well is reduced; the prefabricated well seat mounting bracket is used for mounting the prefabricated well seat, so that the mounting and positioning precision and the construction efficiency of the prefabricated well seat are improved.

This invention discloses a cement-stabilized crushed stone base course material and its construction process, relating to the fields of road engineering and inorganic binder stabilized materials. It includes a load-bearing component A and a moisture-retaining component B, which are mixed separately and laid sequentially. Based on 100 parts by weight of the total dry mass of crushed stone aggregate and mineral shell water-retaining particles in the load-bearing component A, the load-bearing component A comprises 3.8–5.2 parts by weight of silicate cement and 0.4–1.2 parts by weight of mineral shell water-retaining particles. Based on 100 parts by weight of the total dry mass of crushed stone aggregate and mineral shell water-retaining particles in the moisture-retaining component B, the moisture-retaining component B comprises 3.8–5.2 parts by weight of silicate cement and 1.8–4.0 parts by weight of mineral shell water-retaining particles. By placing a larger amount of internal curing water in the upper part of the base course where evaporation is more significant, and placing only a smaller amount of water-retaining particles required for continuous hydration in the lower part of the base course, the effective utilization rate of internal water storage can be improved.

The invention relates to the technical field of constructional engineering, in particular to an efficient road roller for constructional engineering, which comprises a pressing plate, a support is fixedly mounted at the top of the pressing plate, a mounting frame is hinged in the support through a hinge assembly, a driving part is fixedly mounted in the mounting frame, and vibration generating assemblies are arranged at two output ends of the driving part. Adjusting assemblies used for adjusting the centrifugal force of the vibration generating assembly are arranged on the left side and the right side of the mounting frame, and a feedback assembly used for detecting the hardness of the base material is arranged at the bottom of the support. The device has the beneficial effects that when a base material is soft, the tamping force of the pressing plate is also improved, the rotating speed of the driving piece is reduced, the advancing speed of the device is also reduced, the number of times of compaction is increased, air and moisture in the base material are fully discharged, the tamping effect is ensured, and when the base material is hard, the tamping force of the pressing plate is also reduced, so that the tamping effect is improved. And the advancing speed of the device is increased accordingly, the number of times of compaction is reduced, and excessive compaction is avoided.

The present application relates to a kind of preparation methods of niobium tube target material, belong to the preparation technical field of tubular target material for magnetron sputtering, the present application uses niobium powder as raw material, designs special cold isostatic pressing tooling, successively after granularity control proportioning and mechanical uniform mixing, cold isostatic pressing structure assembly, powder filling and cold isostatic pressing, cold isostatic pressing compact machining, hot isostatic pressing structure assembly, vacuum hot degassing of sheath, sheath hot isostatic pressing and machining process preparation niobium tube target material, the niobium tube target material prepared by the present application has the characteristics of high density, uniform structure, small radial thickness deviation, good straightness, controllable length-diameter ratio, and integral binding with back tube forming, etc., coating film applicability is wide, test shows that its relative density is ≥99%, oxygen content is ≤2500ppm, structure is uniform, radial thickness deviation is ≤0.3mm, straightness is ≤1mm, length-diameter ratio is controllable in the range of 8:1~20:1.

The invention relates to an indoor intumescent steel structure aerogel fire retardant coating and a preparation method and application thereof. The indoor intumescent steel structure aerogel fire retardant coating comprises the following components by weight: 5-15 parts of white pigment, 8-15 parts of carbon former, 0.25-1 part of reinforcing agent, 12-35 parts of binder, 0.1-0.3 part of thickener, 0.3-0.5 part of bactericide, 0.1-0.3 part of pH value regulator, 0.2-0.5 part of defoamer, 0.3-1 part of dispersant, 0.5-5 parts of aerogel material and 15-35 parts of water. The fire retardant coating provided by the invention has good flame retardancy and corrosion resistance, is a fully aqueous system, is a product without artificially added toxic and harmful substances such as formaldehyde and benzene series, can improve the fire resistance level of buildings, protect steel structures from deformation and melting, and has good application prospects.