压制压力对放电灯用阴极钨骨架孔隙结构和性能的影响

doi:10.19976/j.cnki.43-1448/TF.2023036

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Abstract Tungsten skeleton with uniformly distributed pores is the key material for producing high-performance electronic cathodes and discharge lamps. This study systematically investigated the effects of pressing pressure on the pore structure, mechanical properties of the tungsten skeleton and the performance of discharge lamp. The results show that with the increase of pressing pressure, the porosity and average pore size of the tungsten skeleton decrease, the microhardness and compressive strength increase, and the uniformity index of pore distribution first increases and then decreases. When the pressing presure is 500 MPa, the pore structure and mechanical properties of the tungsten skeleton are the best, the porosity is 26.29%, the average pore size is 1.24 μm, the uniformity index of pore distribution is 4.17, the microhardness is 1 506 MPa, and the compressive strength is 810 MPa. The xenon lamp prepared by the tungsten skeleton as the cathode substrate do not show any flashovers after continuous flashing for 500 000 times, and its cathode emission performance is stable, and the tungsten cathode has not reach its lifespan limit yet, which shows a significant improvement in lifespan compared to existing cathodes.

Key words： discharge lamp tungsten skeleton electron cathode pore structure mechanical property

Received: 31 March 2023 Published: 21 September 2023

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TM923.32

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	ZHANG Yuning
	WANG Dezhi
	WU Zhuangzhi
	LIU Xinli
	DUAN Bohua

Cite this article:

ZHANG Yuning,WANG Dezhi,WU Zhuangzhi, et al. Effects of pressing pressure on the pore structure and performance of tungsten cathode skeleton for discharge lamps[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(4): 361-367.

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http://pmbjb.csu.edu.cn/EN/10.19976/j.cnki.43-1448/TF.2023036 OR http://pmbjb.csu.edu.cn/EN/Y2023/V28/I4/361

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