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Updated: May 3, 2025
And there were still other ungainly white molds, which were other hulls in process of formation the metal still pouring into the molds in powder form, or being tamped down, or being sintered to solidity. Joe leaned on the gallery-railing and said unhappily, "I can't help worrying, even though the Platform hasn't been shot at since we landed." That wasn't an expression of what he was thinking.
Things could be made of solid steel, he said sharply, without rolling or milling or die-casting the metal, and without riveting or arc-welding the parts together. The trick was powder metallurgy. Very finely powdered metal, packed tightly and heated to a relatively low temperature "sintered" is the word becomes a solid mass. Even alloys can be made by mixing powdered metals.
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