3results about How to "Good extrudability" patented technology

This invention discloses a method for constructing thin-walled components based on cement-based 3D printing, comprising the following steps: Step S1, placing cement-based material into the extrusion equipment of a concrete 3D printer; the extrusion equipment is equipped with a first temperature control system, which controls the temperature inside the extrusion equipment to 10℃±5℃; Step S2, setting the printing parameters of the extrusion equipment according to the model of the thin-walled component, and printing layer by layer from bottom to top on the printing platform using 3D printing technology to form an initial component; the printing platform is equipped with a second temperature control system, which is used to control the temperature of the cement-based material printed on the printing platform; Step S3, curing the initial component on the printing platform at 45℃±5℃ to obtain the thin-walled component. The construction method of this invention is applicable to printing thin-walled components in any temperature and humidity environment, with more than 100 stacked layers and a stacking height of more than 1m, and the resulting printed component has a stable structure.

The present application relates to the technical field of aluminum alloy production and processing, and particularly relates to an easily-extruded high-strength corrosion-resistant aluminum alloy, a manufacturing method thereof and an application thereof. The present application realizes the purpose of improving the material performance by using a higher Zn element while ensuring the corrosion resistance of the material by reasonably adjusting the proportion of Mg, Si and Zn elements. This method can not only improve the strength of the aluminum alloy, but also improve its corrosion resistance, thereby solving the problem of adding a large amount of alloy elements in the prior art, reducing the production cost and the difficulty of alloy element recovery. By controlling the alloy composition and the total aluminum content, the present application ensures that the extrusion deformation resistance of the aluminum alloy is small, has excellent extrudability, and controls the content of some elements to reduce the quenching sensitivity, so that the alloy can produce more complex thin-walled section shapes. The aluminum alloy material of the present application can still maintain good corrosion resistance in a high-humidity and high-salinity environment.

The application provides a kind of anti-freezing high-performance concrete for building 3D printing and a preparation method thereof, the concrete contains cement 80-100 parts by mass, fly ash 80-100 parts, slag powder 220-270 parts, silica fume 15-30 parts, fine aggregate 1200-1500 parts, and polycarboxylic acid high-performance water reducing agent, thickening agent, polypropylene fiber and / or modified cellulose ether, water-binder ratio 0.55~0.67, fine aggregate is natural sand, granite waste sand or mixture thereof, replacement rate 0%~100%. During preparation, accurate measurement, dry mixing, solution preparation, wet mixing fluidization, high-speed slurry, printing forming and moisture curing are carried out. The application adopts microstructure self-optimization active anti-freezing design, without coarse aggregate, which greatly reduces carbon emission, the anti-freezing grade of concrete reaches F125-F150, with excellent printability and mechanical properties, without printing head blockage problem, the preparation process is controllable, and is suitable for building 3D printing engineering in cold and seasonal freeze-thaw areas.