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Vacuum freeze-drying ultrafine powder materials
Vacuum freeze-drying ultrafine powder materials
In recent years, with the vacuum freeze-drying equipment made of ultra-fine powders has been widely used in many important areas of science and technology, this method has the following outstanding advantages.
1 in a solution state can be a very minor component is uniformly mixed in a very minor component for adding, efficient synthesis of complex functional ceramic materials and precisely controls the final composition.
2 ultrafine particles obtained usually in a very small range, when the combustion freeze dried material, containing the gas to escape easily, easily obtained easily sintered ceramic fine powder, whereby a large-scale integrated circuits substrate flatness. Used to produce a catalyst. Reactivity of the surface area is higher than the general process.
3 is simple, especially beneficial for preparing high-purity ceramic material.
Prepared by vacuum freeze-drying mechanism ultrafine powder sample are many.
1 In order to make lithium can have a spoon in the NiO lattice diffusion - reaction ship due to the high temperatures required to 900-1000 ℃, while the freeze-drying process can be as long as 400 ℃, the Apollo fuel cell used in lithium-doped NiO oxygen electrode is dried by freeze-drying and spray into the legal system.
2 is suitable for light-freeze-dried alumina sintered alumina (MgO), MgO uniformly dispersed in the alumina, the theoretical density of up to 99.98%, the average transmittance of 65%, surface roughness, diamond grinding smoothness 0.0004mm, for semiconductor and integrated circuit substrates.
3 was prepared by vacuum freeze dryer UO powder, made radioactive waste from the process less difficult to form in the resulting oxide dust, forming a good, simple process can produce nuclear fuel containing radioactive substances.
4 lyophilized Keng ferrite prepared material can be used as memory storage.
Can be prepared by lyophilization light ceramic insulation, such as aluminum sulfate or sodium salt solution was sprayed into liquid nitrogen to produce a solid microporous structure having a good, solid was removed by lyophilization in water, and the resulting fine powder made certain shape, in] 475-1600 degrees sintering a porous lightweight ceramic can be widely used in metallurgy and aerospace industries for high temperature insulation.
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