Method for preparing high temperature fluent metal loop by quartz and SiCf/SiC composite material

Abstract

The present invention discloses a method for preparing the high-temperature liquid metal loop by using 99.99 percent purity of quartz material and the composite material of SiCf / SiC, which comprises the following procedures: (1) preparing a quartz core mould; (2) adopting three-dimensional weaving technology to prepare a SiC fiber weaving piece on the quartz core mould; (3) mixing the poly carbon siliconalky with dimethylbenzene, high-pressure impregnating the SiC fiber weaving piece in the mixed solution as the impregnation liquid, then carrying out the pyrolysis; repeating five to twenty-five times of the high-pressure impregnation to the pyrolysis, and obtaining the rough mould of the high-temperature liquid metal circuit; (4) carrying out the chemical vapor deposition till the thickness of the coat is three to seventy Mumilimeters and obtaining the high-temperature liquid metal circuit product. The circuit prepared by the invention method has the good compatibility with the metal melt, the low damage on the reinforcing fiber, the superior comprehensive performance of the liquid metal circuit.

Description

technical field [0001] The invention relates to the preparation of parts of a thermonuclear fusion reactor, in particular to a method for preparing a high-temperature liquid metal loop in the reactor. Background technique [0002] As an economical, safe, reliable and clean new energy, nuclear fusion energy is of great significance to fundamentally solve energy shortage and reduce environmental pollution. The fusion reactor is the core component for obtaining and using nuclear fusion energy. Therefore, fusion reactor technology has attracted great attention from countries all over the world. Currently, the United States, Russia, France, China, Japan, South Korea, and India are cooperating on the International Thermonuclear Experimental Reactor (ITER) program to jointly develop fusion reactor technology and plan to use fusion energy for generate electricity. [0003] Material technology is the key in reactor technology. The famous physicist Fermi pointed out as early as 19...

AI Technical Summary

Problems solved by technology

[0006] Currently preparing SiC f The main process technologies of / SiC composite materials include precursor impregnation pyrolysis (PIP), chemical vapor infiltration (CVI), reaction sintering (RS), hot pressing (HP), etc., among which PIP and CVI are mature and widely used , while RS, HP due to their prepared SiC f The impurity content of SiC composite material is relatively high, the preparation temperature is high, the damage to the fiber is large, the comprehensive performance of the composite material is not high, and it is difficult to prepare complex shape composite material components, so RS and HP are rarely used

The main disadvantages of the CVI process are: low densification rate of the matrix, long preparation period, and high manufacturing cost; 10-15% of pores in the composite material are used as escape channels for a large number of deposition by-product molecules, thereby affecting the mechanical properties and resistance of the composite material. Oxidation performance; the concentration of gas near the pore entrance of the porous preform is high, and the deposition rate is greater than the internal deposition rate, which can easily lead to the closure of the entrance, resulting in density gradients and higher material porosity; corrosive by-products are produced during the preparation process, these deficiencies Seriously limit its application in fusion reactors

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