2results about How to "Improve compact strength" patented technology

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 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.