Dear Hoon,
These powders are likely proprietary formulations, and their exact compositions may not be publicly disclosed. However, based on my understanding, the matrix compositions are approximately as follows:
1280V: Fe44Cr6B2Si
1281V: Fe32Cr25Ni4MoB3Cu2Si
It’s unlikely that you’ll find exact equivalents on the open market. as an alternative to 1281V, you might consider Diamalloy 1010. Additionally, there are a few suppliers from China who offer powders with very similar compositions and can also provide customized solutions. You may check the following vendors:
https://spherical-powder.com/
https://www.fusnano.com/
Regards,
Demion Krishan