Speaker
Description
With the increasing scarcity of ³He gas resources and the rapid advancement of neutron detection technologies, boron-coated neutron detectors have emerged as a promising alternative to traditional ³He proportional counters. This study employed a pipe inner-wall magnetron sputtering coating technique to deposit B₄C thin films with a thickness of approximately 1 μm on the inner surfaces of stainless steel and titanium (Ti) tubes. The film-substrate adhesion strength of the B₄C coatings on both substrates was systematically investigated. To achieve uniform coating on the inner walls of elongated pipes, a dedicated coating device was designed, capable of accommodating neutron detector pipes with varying diameters and lengths. A numerical model of the coating system was developed using the Particle-in-Cell Monte Carlo Collision (PIC-MCC) method, and plasma characteristics under different discharge parameters were simulated to identify optimal conditions for stable discharge in elongated pipes. Under the optimized discharge parameters, B₄C thin films were successfully deposited on the entire target regions of the neutron detector tubes, and the axial thickness distribution of the films was characterized. Experimental results demonstrated that the B₄C coatings on Ti tubes exhibited significantly enhanced film-substrate adhesion strength compared to those on stainless steel tubes.
Funding Agency
The National Natural Science Foundation of China (No. 12505184，12505183)
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