CLIC Meeting 21/08/2001

G. Arnau Izquierdo EST/SM

1

Electropolishing of W Electropolishing of W irises. SEM images.irises. SEM images.

1) Manufacturing ways.

2) CERN Workshop iris images.

3) Flueckiger iris images.

4) Plansee iris images.

5) Conclusions.

CLIC Meeting 21/08/2001 G. Arnau Izquierdo EST/SM

2

Manufacturing ways.Manufacturing ways.

Sintered + Hot forged W Ø36mm rod, 99.96% purity

Sintered +Hot forged W

EDM

EDM: Electrical Discharge Machining = Electro-erosionEP: Electropolishing

EP test: - 6 µm - 7 µm

Abrasive Blasting

EDM

Abrasive Blasting?

EDM

Cylindrical Grinding

EP

CERNWorkshop Flueckiger Plansee

Delivery2 iris for delivery : - 8.5 µm & - 16.5 µm

EP test: - 8 µm - 9 µm - 27 µm

CLIC Meeting 21/08/2001 G. Arnau Izquierdo EST/SM

3

CERN workshopCERN workshopBefore Electropolishing (1/2)Before Electropolishing (1/2) EdgeEdge StainsStains FlakesFlakes Blasting incrustation Blasting incrustation

400µm 50x

CLIC Meeting 21/08/2001 G. Arnau Izquierdo EST/SM

4

CERN WorkshopCERN WorkshopBefore Electropolishing (2/2)Before Electropolishing (2/2)

20µm

100µm

1000x

200x

CLIC Meeting 21/08/2001 G. Arnau Izquierdo EST/SM

5

CERN WorkshopCERN Workshop

After Electropolishing (1/2)After Electropolishing (1/2) - 8µm + - 9µm- 8µm + - 9µm Intergranular cracksIntergranular cracks PoresPores

400µm 50x

CLIC Meeting 21/08/2001 G. Arnau Izquierdo EST/SM

6

CERN WorkshopCERN WorkshopAfter Electropolishing (2/2)After Electropolishing (2/2)

20µm

100µm

1000x

200x

CLIC Meeting 21/08/2001 G. Arnau Izquierdo EST/SM

7

FlueckigerFlueckigerBefore Electropolishing (1/2)Before Electropolishing (1/2) EdgeEdge

400µm 50x

CLIC Meeting 21/08/2001 G. Arnau Izquierdo EST/SM

8

FlueckigerFlueckigerBefore Electropolishing (2/2)Before Electropolishing (2/2)

20µm

100µm

1000x

200x

CLIC Meeting 21/08/2001 G. Arnau Izquierdo EST/SM

9

FlueckigerFlueckiger

After Electropolishing (1/2)After Electropolishing (1/2) - 6µm + - 7µm- 6µm + - 7µm Intergranular cracksIntergranular cracks PoresPores

400µm 50x