3results about How to "Guaranteed flexural strength" patented technology

The application relates to a carbon / carbon-silicon carbide gradient composite material for a photovoltaic thermal field and a preparation method and application thereof, and belongs to the technical field of monocrystalline silicon furnace thermal fields and carbon / carbon composite materials. The preparation method comprises the following steps: a carbon / carbon-silicon carbide gradient composite material is prepared through a chemical vapor deposition densification process and a chemical vapor deposition coating process on a silicon-containing carbon fiber composite preform; and the silicon-containing carbon fiber composite preform is prepared by spraying or impregnating a carbon fiber preform with a resin containing a silicon precursor and / or a silicon-containing organic binder. The carbon / carbon-silicon carbide gradient composite material prepared by the application forms a gradient from inside to outside and in a radial direction, improves the silicon corrosion resistance of the carbon fiber itself and the overall carbon / carbon-silicon carbide gradient composite material, reduces the reaction speed with silicon and SiO2 at high temperatures, fundamentally solves the carbon and silicon reaction problem of a carbon / carbon composite material crucible, a heat preservation barrel or a flow guide cylinder for a monocrystalline furnace, and effectively improves the service life of a monocrystalline silicon furnace thermal field composite material product.

The application discloses an alumina ceramic membrane sintering aid and a preparation method and application thereof, relates to the technical field of ceramic membranes, and the alumina ceramic membrane sintering aid is composed of nano silicon oxide and foamed powder, wherein the foamed powder comprises 20 parts of alumina powder, 50-80 parts of potassium feldspar, 5-20 parts of sodium feldspar, 0.1-1 part of sodium carboxymethyl cellulose, 0.1-1 part of sodium tripolyphosphate, 0.5-3 parts of sodium hexametaphosphate, 0.3-1 part of 1000-mesh manganese dioxide, 0.1-0.6 part of 1000-mesh silicon carbide and 100 parts of water. The alumina ceramic membrane sintering aid is controllable in particle size, and the temperature can be controlled when the alumina ceramic membrane sintering aid is applied to the preparation process of an alumina ceramic membrane support. In the preparation process of the alumina ceramic membrane support, the nano silicon dioxide in the sintering aid can adjust the viscosity of high-temperature liquid, accelerate the reaction between the sintering aid and the alumina powder, has a larger bridging effect, and the porous liquid at high temperature can guarantee the strength of the alumina ceramic membrane support and increase the porosity.

This utility model provides a heat-resistant composite collar with a support column structure, comprising: a semi-composite collar assembly, wherein the semi-composite collar assembly includes a semi-composite collar body, a support column, a hidden groove, and an interlocking groove. Compared with the prior art, this utility model has the following beneficial effects: by adding a semi-composite collar assembly, a first connector, and a second connector, the first connector and the second connector are respectively installed at the connection points of two symmetrically arranged semi-composite collar assemblies, and the first connector and the second connector are pre-fixed with the semi-composite collar assembly. The semi-composite collar assembly is sleeved onto the outside of the heat-resistant composite roller, and the connection and fixation are achieved through the connection of the first connector and the second connector. Furthermore, the load-bearing capacity is distributed through the contact between the support column and the workpiece, thereby facilitating the disassembly and assembly of the heat-resistant composite collar. By adding the semi-composite collar assembly, a spiral guide groove is opened on the outer side of the support column to achieve auxiliary heat dissipation, which can improve the overall performance.