Preparation method of high-temperature molten salt pipeline
A high-temperature molten salt and pipeline technology, applied in pipeline protection, pipeline protection through heat insulation, pipeline anticorrosion/rust protection, etc., can solve the problems of high requirements for pipelines, and achieve low void ratio, high pressure resistance, and light weight Effect
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Embodiment 1
[0021] According to the shape of the control rod casing, process a graphite core material with a length of 3000mm, an inner diameter of 60mm, an outer diameter of 70mm, a U-shaped bottom and an open upper part.
[0022] Set the density to 1.80g / cm 3 The high-purity graphite core material is used as the substrate, and then trichloromethylsilane (MTS) is used as the precursor raw material, hydrogen is used as the carrier gas, and argon is used as the diluent gas to deposit a layer of 2mm carbonization by chemical vapor phase in the range of 950-1300 ° C. Silicon impermeable layer.
[0023] Using T700 grade carbon fiber as a reinforcement, the carbon fiber impregnated with phenolic resin is used to uniformly wind the core material of the silicon carbide coating through the numerical control fiber winding machine. The winding temperature range is 25-40°C, the tension is 3-5kg, and the angle is 0° 25°, winding thickness 5-6mm, the resin used is thermosetting phenolic resin.
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Embodiment 2
[0028] The passing density is 2.0g / cm 3 A graphite tube with an outer diameter of 100mm and an inner diameter of 80mm is made of high-purity graphite material.
[0029] Put the graphite tube into the deposition furnace, and use methane as the carbon source to generate the pyrolytic carbon anti-seepage layer. In the temperature range of 1000-1500°C, methane flow rate of 300-800ml / min, and pressure of 6-12KPa, a pyrolytic carbon coating of 2-3mm is formed after 4-6h.
[0030] T1000 grade carbon fiber is selected as the reinforcement, and the carbon fiber is wound on the surface of the prepared pyrolytic carbon coated graphite through a numerical control fiber winding machine. The winding temperature range is 25-40°C, the tension is 5-10kg, the angle is 85°-90°, and the winding thickness 5-6mm.
[0031] Put the wrapped product into the autoclave to impregnate the phenolic resin at a pressure of 2-5MPa for 6-10 hours, and cure the impregnated sample at a pressure of 1-2MPa and a...
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