ນັບຕັ້ງແຕ່ວັດສະດຸທີ່ໃຊ້ໃນການຕິດຕໍ່ສູນຍາກາດ (ຕິດຕໍ່ພົວພັນໄຟຟ້າ) are binary and above alloy materials, and the main elements are required to have pseudo alloy characteristics, powder metallurgy and vacuum (controllable atmosphere) melting are adopted in the production and manufacturing process.(ຕິດຕໍ່ພົວພັນໄຟຟ້າ)
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