Fluorocrystalline mica, also known as fluorphlogopite mica, synthetic mica, artificial mica, synthetic mica crystal, belongs to the silicate type artificial mica crystal, is under the high temperature condition of 1500°C, through strict process conditions and material ratio, in platinum The mica crystals smelted in the yttrium have a chemical formula of KMg3(AISi3O10)F2(OH)-, and do not contain (OH)-. The (OH)-hydroxyl group is replaced by F-(fluoro), which is similar to the fluorite mica. Materials commonly used in the general industry are natural mica. Natural mica is an underground ore naturally formed and belongs to the class of silicates. Most of the industrial mica used is phlogopite (brown) and muscovite. Its ideal chemical formula is KAI2(AISi3O10)(OH)2. OH)-(Hydroxy), due to the presence of hydroxyl (water molecules), its performance in all aspects is far lower than that of fluorocrystalline mica.
The main characteristics of fluoride crystal mica:
1, high temperature: can work long-term in the 1100 °C environment.
The testing department of the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (nationally recognized testing institute) tested the thermal weight loss of 8% at 1100°C for 48 hours, and the melting and devitrification temperature was 1375°C.
2. Electrical insulation: The volume resistivity is 10 times higher than natural mica. Electrical breakdown strength is PTFE
Lean 10 times.
3, hot and cold blasting stability is very good
5 cycles of -40°C~70°C at the 5th Saibao Lab of the Ministry of Information Industry
Inspection, all qualified.
4, anti-corrosion:
Fluorophlogopite does not react with acid and alkali solutions, and does not react with water. Under the long-term (2 to 3 years) scouring of high-temperature and high-pressure water (including acid and alkali), the original clarity and transparency can still be maintained.
5, high frequency performance:
The dielectric constant of fluorite mica is 4.6 ε, and the dielectric loss is (1~4)×10 −4 tg δ, and the dielectric loss is very low. And because of the pure texture, all parameters are extremely stable.
6, optical properties
Since the fluorite mica contains less impurities, its light transmittance is compared from infrared to ultraviolet.
High, the transmittance is close to 100%.
7, Mosaic (Mosaicity):
The Mosaicite of fluorocrystalline mica is less than 0.25 degrees, which was produced in the experiment.
The neutron flame is not high enough to absorb multi-band light beams and is an ideal neutron monochromator test material.
8, vacuum deflation performance:
The evaporative volume of fluorite mica is low, and it is measured with a mass spectrometer and the trace gas released is only
O2, N2, Ar and other adsorbed gases. Since the H2O vapor is not released, this is extremely valuable for use as an electrical vacuum insulation material, which can greatly increase the service life of the vacuum device.
9, excellent physical properties:
Fluorocrystalline mica has atomicity flatness, transparency, separability and elasticity, not aging
It is not brittle and so on.
Due to the high temperature resistance, corrosion resistance, low frequency loss, and high bulk resistivity
Absorb multi-band light beam, excellent light transmittance and other advantages. Therefore it has become an ideal new material in the high-end area.
Fluorocrystalline mica Available in:
In the range of 180mm×53mm or ∮76mm, it can be processed into various shapes according to user requirements. Thickness within the range of 0.02mm~1.0mm can be allocated according to user requirements. The conventional thickness is 0.04~0.2mm.
Fluorine crystal (fluorphlogopite, artificial mica) mica film for observation window of high pressure boiler water level gauge in thermal power plant
Fluorophlogopite Mica,Fluorophlogopite Sheet,Synthetic Fluorophlogopite Mica,Fluorophlogopite Mica Fragments Changchun City Taiyuan FluorphlogopiteCo. Ltd. , https://www.micaslice.com
First, the choice of leaf fertilizer should be targeted
Crop plants mainly absorb nutrients from the soil, and the content of elements in the soil plays a decisive role in the growth of plants. Therefore, before determining the type of leaf fertilizer, the content of elements in the soil and the acidity and alkalinity of the soil should be determined. Conditionally, the presence of elements in the plant body can be determined, or the type of leaf fertilizer can be determined according to the external characteristics of the deficiency factor. And dosage. It is generally believed that in the case of insufficient application of base fertilizer, foliar fertilizers mainly composed of nitrogen, phosphorus and potassium may be used; when sufficient application of base fertilizer is applied, foliar fertilizers mainly based on trace elements may be selected. For example, the falling bud of cotton buds is related to the lack of boron nutrition. Therefore, it is generally applied 2-3 times in the bud stage, and combined with the application of boron fertilizer, the effect of protecting the buds can be obtained; the cleavage of celery It is also caused by boron deficiency, which can be supplemented by spraying borax or boric acid.
Second, the solubility of leaf fertilizer is better
Since the foliar fertilizer is directly sprayed into a solution, the foliar fertilizer must be soluble in water. Otherwise, the insoluble matter in the foliar fertilizer is sprayed onto the surface of the crop, not only can not be absorbed, and sometimes even damage to the leaves. Therefore, the purity of the fertilizer used for spraying should be higher, and the impurities should be less. Generally, the water insoluble matter in the fertilizer should be no more than 5%.
Third, the acidity of leaf fertilizer should be suitable
Nutrient elements have different states of existence under different acid and alkali conditions. To get the most out of the fertilizer, you must have a suitable range of acidity, generally requiring a pH between 5 and 8. If the PH value is too high or too low, in addition to the absorption of nutrients, it will also harm the plants.
Fourth, the concentration of leaf fertilizer should be appropriate
Since the foliar fertilizer is directly sprayed on the surface of the upper part of the crop, unlike the root fertilization, the buffering effect of the soil is lost. Therefore, we must master the spraying concentration of leaf fertilizer. If the concentration is too low, the amount of nutrients in contact with the crop is small, and the effect is not obvious; if the concentration is too high, the leaf will cause burns. However, the same fertilizer is applied to different crops at different concentrations, depending on the type of crop. For example, urea: the concentration of general crop spraying is 1%-2%; the spraying concentration of crops such as open vegetables, melons and fruits is generally 0.5%-1%, and the concentration of spraying on greenhouse vegetables is 1%-2%; vegetables and fruits in open fields The spraying concentration on the crops should be controlled at 0.2%-0.4%, and the seedling spraying concentration in the seedling nursery period should not be higher than 0.2%. Trace elements can be applied or foliar sprayed, but since some trace elements are easily precipitated in the soil and lose their effectiveness, it is best to use foliar spray in production. The spray concentration is usually from 0.3% to 0.5% aqueous solution. The application concentration of copper and molybdenum should be appropriately reduced.
Five, leaf fertilizer should be used with
The physicochemical properties of fertilizers determine that some nutrients are prone to deterioration, so some foliar fertilizers should be used as needed and cannot be stored for a long time. For example, ferrous sulfate leaf fertilizer, the newly formulated should be light green, no precipitation, if the solution turns auburn or produces a reddish brown precipitate, indicating that low-cost iron has been oxidized into high-priced iron, the effectiveness of fertilizer has been greatly reduced. If the water-alkali or calcium content of the ferrous sulfate solution is too high, the rate of precipitation and oxidation will increase. Therefore, in order to reduce the formation of precipitates and slow down the oxidation rate, 10 ml of mineral acid should be added per 100 liters of water in the preparation of ferrous sulfate solution, or 100-200 ml (about 100-200 g) of vinegar can be added to acidify the water. Then dissolve the ferrous sulfate with water that has been acidified. It is of course also possible to use some organic chelated iron fertilizers such as iron fulvic acid and iron-based polyflavones instead of ferrous sulfate.
Six, the application time of leaf fertilizer should be appropriate
In order to prolong the time when the foliage is wetted by the fertilizer solution, it is beneficial to absorb the elements, and the spraying time of the leaf fertilizer is preferably selected before and after the evening wind. This can delay the air drying speed of the leaf surface droplets, which is beneficial to the penetration of ions into the leaves. Spray evenly so that the front of the blade is wet. In case of heavy rain after spraying foliar fertilizer, it should be sprayed again.
Seven, as an effective measure to adjust the disease of plant deficiency, the application is very extensive. However, in order to maximize the benefits of leaf fertilizer, the most critical fertilizer spraying period should be selected according to the growth of different crops to achieve the best results. The common period of leaf fertilizer is shown in the table.
Because foliar fertilizer has the characteristics of quick effect, high utilization rate, low dosage, simple application method and obvious effect of increasing yield, it is widely used in agricultural production. So, how can we maximize the benefits of use without adverse consequences? The author believes that the following points should be noted when using.
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