8 results about "Linear shrinkage" patented technology

This invention discloses a silicone foam sheet and a battery module and battery pack containing the same, belonging to the technical field of silicone foam materials. The linear expansion coefficient α of the foam sheet's pore diameter satisfies 1≤α≤8, and the linear contraction coefficient β of the foam sheet's pore wall thickness satisfies 4≤β≤9. This invention enables the silicone foam sheet to have more spatial gaps and a lower thermal conductivity under room temperature conditions; it also enables the silicone foam sheet to maintain an intact pore structure and high strength after sintering at high temperatures, thus preventing breakage. Therefore, the silicone foam sheet of this invention has good thermal insulation performance; simultaneously, the silicone foam sheet of this invention also exhibits good cushioning performance.

The reinforcing filler in the dental resin cement composition provided by the present invention has a particle size distribution that simultaneously satisfies D75-D25≤0.95μm, D25-D15≤0.7μm, and D50 of 0.5~1.0μm. Specifically, the present invention improves the chemical curing time, edge sealing, and linear shrinkage rate of dental resin cement by controlling the D15 / D25 / D75 and D50 of the reinforcing filler in the matrix and catalytic portions to have the above-mentioned specific numerical relationships.

This invention presents the utilization of amorphous porous silicate particles (APSP) derived from rice husk agricultural waste sourced from Mindanao, Philippines, as an additive and replacement to sand in cement mortars. The solid-liquid ratio, percent water absorption, total porosity, specific gravity, linear shrinkage, surface morphology, modulus of rupture (MOR), and thermal conductivity of the cement blocks were analyzed. Additionally, the researchers valuated different formulations, such as the control and the three different APSP formulations, namely APSP-33, APSP-50, and APSP-100. Moreover, analysis shows that the formulation of APSP100 cement mortars reveals a higher MOR value, lightweight at 0.77 in density, and a lower thermal conductivity. Furthermore, experiment results showed that the APSP could be used as an additive or to replace sand and can be a potential material for thermal management applications with a thermal conductivity of 0.1497 w / mK. The possible use of this material can be found suitable for commercial use, such as lightweight blocks, boards, and other household applications for thermal management.

This invention belongs to the field of high-temperature resistant fiber application technology, specifically disclosing a high-temperature resistant multi-element doped modified high-silica fiber. It is prepared using sodium borosilicate ternary glass as a precursor through Cr-Al-B multi-element synergistic doping and deep impurity removal. The fiber's mass percentage composition is: SiO2 ≥ 97-99%, Cr2O3 0.2%–0.9%, Al2O3 1.5%–2.8%, B2O3 0.4%–1.8%, ZrO2 0.10%–0.25%, with the remainder being unavoidable impurities. The fiber contains Na... + With K + The total content is less than 40-55 ppm; the linear shrinkage rate after constant temperature heat treatment at 1100℃-1200℃ for 5-10 hours is less than 0.5-1.3%; and the high-temperature strength retention rate after constant temperature heat treatment at 1100℃-1200℃ for 80-100 hours is greater than 82-90%. The beneficial effects of this invention are: the use of a stepped dynamic acid leaching method combining cyclic countercurrent and dynamic fiber bundle rotation eliminates radial component segregation in the fibers, ensuring uniform doping; and the use of ultrasonic assistance to enhance mass transfer through cavitation effect improves acid leaching efficiency by more than 40%, resulting in Na... + / K + The removal rate is ≥99%; the multi-stage gradual heating sintering process is used to form a stable amorphous structure in the fiber, which effectively inhibits the crystallization of quartz above 1000℃.

The application discloses a kind of high solid content low viscosity SiC ceramic double solidification slurry and low shrinkage green body preparation method, it is related to SiC ceramic additive manufacturing technical field.For solving the problem of existing slurry solid content low, viscosity high, green body shrinkage big, green body strength low, the modified SiC powder of surface in-situ growth SiO2 / phenolic resin composite core-shell is used in the present application, with photosensitive resin and thermal gel matrix, build double solidification slurry system;After photo-curing layering, thermal gel secondary reinforcement, ladder debinding and pressureless sintering, obtain low shrinkage, high strength SiC green body and dense ceramic.The application realizes slurry solid content 65~72vol%, viscosity≤1200mPa·s, green body linear shrinkage rate≤8%, green body strength≥8MPa, and is suitable for semiconductor precision ceramic component additive manufacturing.

This invention discloses a method for predicting and controlling dimensional tolerances in complex cast steel parts with multiple bosses, belonging to the field of cast steel casting technology. The method includes: dividing the casting into a main body and boss areas; collecting and classifying boss structural parameters; setting a linear shrinkage rate of 1.8% for the main body area and customizing a differentiated shrinkage rate of 1.4% to 1.8% for the boss areas based on size and distribution density; matching process parameters such as zoned pouring temperature, sand mold compaction, and chill riser arrangement; simulating the solidification process using ProCAST software to optimize the shrinkage rate to a boss dimensional deviation ≤ ±0.5mm; and detecting the dimensions after actual pouring and incorporating them into a database. This invention fundamentally solves the problem of dimensional deviation caused by uneven shrinkage in multi-bore cast steel parts, controlling boss dimensional deviation within ±0.5mm, eliminating the need for carbon planing and welding repair, reducing processing costs by more than 30%, and increasing the casting yield to over 95%. It is applicable to the production of complex multi-bore cast steel parts in industries such as thermal power and shipbuilding, and has good versatility and applicability.

The application relates to a method for preparing a composite ceramic by using a direct-writing 3D printing technology and belongs to the field of additive manufacturing of ceramic materials. The application aims to solve the problem that, after existing ceramic precursors are directly printed, the pyrolysis process from a polymer to a ceramic of a green body has a high linear shrinkage rate and porosity, and leads to the decline of mechanical properties. The method comprises the following steps: I. weighing; II. preparing a ceramic slurry; III. 3D printing; and IV. solidification and pyrolysis. The application can realize the integrated forming of a three-dimensional ceramic component with complex shapes, different resolutions, low shrinkage, high ceramic yield, good mechanical properties and dielectric properties by changing the diameter of a needle. The application is used for preparing a composite ceramic by using a direct-writing 3D printing technology.