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>>摻雜鎢絲
摻雜是在三氧化鎢或藍色氧化鎢中摻入微量K2O、Al2O。和SiO2。摻雜鎢絲,性能優於普通鎢絲,廣泛運用在微波爐、電視、焊接材料、特種照明等領域。 鎢中加入錸能顯著提高延展性(塑性)及再結晶溫度。某些鎢錸合金經適當高溫退火處理後,延伸率可達到5%,遠較純鎢或摻雜鎢的1%~3%為高。鎢中加入0.4%~4.2%氧化釷(ThO2)形成的鎢釷合金,具有很高的熱電子發射能力,可用作電子管熱陰極、氬弧焊電極等,但ThO2的放射性長期未得到解決。 摻雜鎢絲的生產工序冗長,包括鎢冶煉、粉末冶金製坯和塑性加工幾個主要階段。以仲鎢酸銨為原料生產摻雜鎢絲的工藝流程見圖。 掺杂鎢絲生產工藝流程简图
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