65results about How to "Improve densification efficiency" patented technology

The invention provides a method for preparing a hot isostatic pressing niobium oxide target material for a sputter coating. By means of the method, high-purity niobium pentoxide powder serves as a raw material, and the purity of the niobium pentoxide powder is not lower than 99.99%; the powder is packaged into a packaging sleeve after being pretreated; then vacuum thermal degassing is conducted on the powder, and the powder is pressed and molded in a hot isostatic pressing machine; and afterwards, a finished product is manufactured through machining. The niobium oxide target material prepared through the method has the beneficial effects that the density of the target material is high, and the density can reach 4.5 g / cm<3> or higher; and conductivity is good, the specific resistivity ranges from 2*10<-4> omega.cm to 5*10<-4> omega.cm, and the requirement for manufacturing niobium oxide films through an intermediate-frequency or direct current sputtering technology can be met.

The invention discloses a multi-deposition-chamber CVI (chemical vapor infiltration) device for compacting a carbon / carbon crucible and a method using the same. The device comprises a chemical vapor deposition furnace consisting of an outer furnace tank and an inner furnace tank and also comprises multiple layers of graphite partition plates which are distributed in the inner furnace tank from bottom to top and multiple intake tubes which are inserted in the inner furnace tank from bottom to top; adjacent two layers of graphite partition plates are isolated by multiple graphite shores; the upper part of the graphite partition plate arranged on the most-top layer is provided with a gas-sealing plate; dependant deposition chambers are respectively formed between adjacent two layers of graphite partition plates and between the gas-sealing plate and the graphite partition plate arranged on the most-top layer; multiple deposition chambers are distributed from top to bottom; and the multiple intake tubes are respectively inserted into the multiple deposition chambers from bottom to top. The compacting method comprises the following steps: 1, charging of a crucible prefabricated body; and 2, compacting treatment. The device disclosed by the invention has simple structure, reasonable design, good use effect, good compacting effect, good density uniformity, large charging amount and the like, is convenient for assembling and easy to use and operate.

The invention discloses a quartz fiber-reinforced quartz-based composite material and a manufacturing method thereof. The commercially available acidic silica sol is concentrated by vacuum rotary evaporation to obtain concentrated silica sol with a concentration of 30%-47%, and the concentrated Silica sol is divided into high-concentration silica sol and medium-concentration silica sol according to different concentration ranges, and a combined impregnation scheme with different concentrations of silica sol is designed for different densification cycles. Compared with the normal pressure heating and concentration method, the concentration efficiency of the vacuum rotary evaporation method is high, the obtained concentrated silica sol has good stability, and the size of the micelles contained is small, which is beneficial to the full impregnation of the fiber preform. The combined impregnation scheme adopted improves the densification efficiency, thereby achieving a SiO 2f / SiO 2 Efficient preparation of composite materials.

The invention discloses a fabrication method of an automobile brake disc. An automobile brake pair pre-fabricated body is fabricated with carbon fiber prepreg through integrated molding pressing, anda polysilazane solution and a polycarbosilane solution are used as a ceramic precursor; the automobile brake pair pre-fabricated body is fabricated through an integrated molding pressing process, andthe density of the pre-fabricated body is larger than 1.4 g / cm3; a carbon fiber automobile brake pair pre-fabricated part is impregnated through the liquid ceramic precursor; the liquid precursor is subjected to high-temperature pyrolyzing after cross-linking and solidifying are finished and then is converted into a ceramic substrate; and then the impregnation-pyrolysis process is repeated, and finally a carbon fiber reinforced carbon-based / ceramic-based composite material is obtained. The production period is shortened greatly, the production cost is reduced, the densification efficiency is improved, and through adjustment of the impregnation proportion of polycarbosilane and polysilazane, the friction property and mechanical strength of an automobile brake pair can be optimized at the same time.

The invention discloses a CVI densification method for an open container and an air pipeline structure. The CVI densification method is particularly applicable to a small-opening complicated container. Specifically, an air guide pipe is inserted into a small opening of the container body; the air guide pipe is directly inserted into the bottom of the container; uniform air vents are distributed in the air guide pipe; one exhausting pipe is inserted into the air guide pipe and is used as a tail gas discharging passage; a main air guide pipe and a main exhausting pipe are respectively connected with N branch air guide pipes and N branch exhausting pipes of the container; an outer interface of the main air guide pipe is connected with an air charging pipe of a furnace; the main exhausting pipe is connected to a vacuum pump; a plurality of small-opening containers can be deposited at one time in the furnace, so the densification efficiency is improved.

The invention relates to a preparation method of silicon carbide and silicon carbide composite material member, especially relates to a preparation method of deformed silicon carbide and silicon carbide composite material member, and belongs to the technology field of ceramic matrix composite material. The impregnation phase and the precursor used in the preparation method not only comprise the solid PCS, but also comprise the liquid PCS, which is more cheap, so the technology matching property of the member is stronger, the densification efficiency of the member is improved to some degree, the cost is reduced and the preparation period of the member is shortened. The impregnation phase has little harm to the environment and the operators, and only a general type ventilation device is needed.