Molybdenum disc

Molybdenum disc introduction

Molybdenum disc has similar thermal expansion to silicon. They are widely used as contact materials in silicon controlled rectifier’s diodes, transistors and thyristors (GTO’S). Other than in specialist applications, molybdenum is now accepted as the first choice mounting material for power semiconductor devices due to its significantly lower cost and weight. The fact that both materials have a similar coefficient of expansion to silicon combined with high thermal conductivity makes them an ideal choice, especially in large area power devices where considerable heat is generated. Further applications include the use of molybdenum as heat sink bases in IC’S, LSI’S and hybrid circuits.

Specification of molybdenum disc

THICKNESS		DIAMETER
mm	inch	mm	inch
0.1 - 0.3	0.004 - 0.012	1.0 - 50.0	0.040 - 2.0
0.31 - 0.5	0.012 - 0.020	1.0 - 50.0	0.040 - 2.0
0.51 - 1.0	0.020 - 0.040	2.0 - 80.0	0.080 - 3.2
1.1 - 2.0	0.040 - 0.080	10.0 - 130.0	0.40 - 5.2
2.1 - 3.0	0.080 - 0.120	20.0 - 130.0	0.80 - 5.2
3.1 - 4.0	0.120 - 0.160	40.0 - 100.0	1.60 - 4.0
4.1 - 6.0	0.160 - 0.240	50.0 - 90.0	2.0 - 3.6

Grade of molybdenum material

Grade		Mo-1	Mo-2	Mo-3
Mo(%)≥		99.95	99.95	99.92
Other Element Cont (%)≤	Pb			0.001
	Bi			0.001
	Sn			0.001
	Sd			0.001
	Cd			0.001
	Fe	0.005	0.006	0.030
	Ni	0.002	0.001	0.005
	Al	0.002	0.002	0.005
	Si	0.003	0.001	0.010
	Ca	0.002	0.002	0.004
	Mg	0.001	0.001	0.003
	P	0.001	0.001	0.002
	C	0.005	0.003	0.010
	O	0.003	0.005	0.008
	N	0.001	0.001

Note: We can also produce molybdenum square and different shapes of molybdenum slice according to customers’ requirement and drawing.

Molybdenum disc

Molybdenum disc introduction

Specification of molybdenum disc

Grade of molybdenum material

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