The problem of boride, a rare element
1. Process maturity
So far, borides have not been used in practical production of decorative coating films. Therefore, the stability and repeatability of the process are not certified.
2. Production cost
It is difficult and costly to manufacture both the whole target materials of these compounds and the target materials of rare elements with reaction gas (boranes).
3. Based on the above two points, its practicability needs to be further confirmed.
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