First wall part coated with thick wolfram coat or copper alloy heat sink and mfg. method thereof

Abstract

The invention discloses a first wall part or copper alloy heat sink sprayed with thick W coating and the making method thereof, composed by in turn adopting vacuum plasma to spray adaptive layer and W coating on the surface of the copper alloy, where the copper alloy acts as a heat sink material, the adaptive layer is of NiCrAl material, the W coating acts as a plasma facing material, the thickness of the adaptive layer is controlled within 0.5 mm, the central temperature of the spraying plasma arc is 12000K-15000K and the speed of the plasma arc is 400 m / s -500 m / s, the average grain size of the W powder is 2 mm-5 mm, the coating thickness is about 2 mm, the coating density is 85%-95% of the body material, the oxygen content is controlled at 0.06%-0.15%, and in the whole spraying course, the substrate temperature needs controlling at below 500 deg.C by active water cooling. The invention solves the key difficult problem of large-area connection between the two materials and can stably bear the long-time action of thermal load of 5 MW / m2 -10 MW / m2 on the active cooling condition, able to be widely applied to high-thermal load parts of a nuclear fusion tester, such as polarizing filter target plate and limiter.

Description

technical field [0001] The invention relates to a first wall part (heat sink part) used in a nuclear fusion device, in particular to a vacuum plasma sprayed thick tungsten coating on a copper alloy heat sink and a manufacturing method thereof. Background technique [0002] With the upcoming construction of the International Thermonuclear Experimental Reactor ITER, research on plasma-facing materials (PFM) suitable for ITER and future fusion reactor requirements is a hot, difficult and frontier research topic in fusion research, and is directly related to future fusion reactors. The question of whether it can be realized. [0003] After years of research, currently recognized and alternative plasma-facing materials mainly include high Z (atomic number) tungsten and low Z (C, Be). Among them, low-Z materials play a very important role in the improvement of plasma performance and the improvement of the energy triple product (neTe×τE), which represents the progress of fusion re...

AI Technical Summary

Problems solved by technology

Tungsten is brittle at room temperature, and it is inconvenient to process and use. In particular, the thermal expansion coefficients of tungsten and copper alloy heat sinks differ greatly (more than 4 times), which brings considerable difficulties to the functional integration of the tungsten-based first wall material system.

The ITER divertor target plate project has developed a pure copper layer cast by active metal on the copper alloy heat sink, and then through isostatic pressing or electron beam welding to realize tungsten rod (Rod), layer (Lamellar) and brush (Macrobrush) The connection of three concepts, such as the complex process and high cost, is difficult to use in a large area