Etchable core glass compositions and method for manufacturing a high performance microchannel plate

• US 5,108,961 A
• Filed: 05/10/1991
• Issued: 04/28/1992
• Est. Priority Date: 12/29/1989
• Status: Expired due to Fees

• Current Assignee: Circon Corp. (Olympus Corporation)
• Original Assignee: Circon Corp. (Olympus Corporation)
• Inventors: Williams, John A., Zhong, William J. S.
• Primary Examiner(s): Dixon, Jr., William R.
• Assistant Examiner(s): GALLO, CHRISTOPHER
• Application Number:
  US07/698,661
• Time in Patent Office: 354 Days
• Field of Search: 501/65, 501/67, 501/77, 501/78, 501/79, 313/105 R
• US Class Current: 501/65
• CPC Class Codes: C03C 3/068 containing rare earths
• CPC Class Codes: C03C 3/095 containing rare earths
• CPC Class Codes: C03C 3/108 containing boron
• CPC Class Codes: G02B 6/08 with fibre bundle in form of plate
• CPC Class Codes: H01J 43/246 Microchannel plates [MCP] image amplification tubes using MCP H01J31/507

Abstract

An etchable core glass composition consisting essentially of the following components present in the glass in the following mole percent ranges is shown:

              CHART I                                                     

______________________________________ CHEMICAL COMPOSITION RANGES mole percent ______________________________________ SiO₂ 35-46 B₂ O₃ 22-28 BaO + SrO + CaO + ZnO 20-32 Al₂ O₃ + Y₂ O₃ 0-3.5 La₂ O₃ + Nd₂ O₃ + Sm₂ O₃ + CeO₂ 1-11 As₂ O₃ + Sb₂ O₃ 0-1.5 ______________________________________

A core glass for manufacturing a microchannel plate made from a glass composition having components in the glass range as defined above is also shown. The core glass has a transformation temperature in range of about 637° C. to about 654° C., a liquidus temperature below 1000° C. and wherein the composition consists essentially of the components described herein above and wherein the glass has an average lineal coefficient of thermal expansion in the range of about 74×10^-7 per °C. to about 91×10^-7 per °C. at a temperature between 25° C. and 300° C. is shown.

Claims

1. A glass composition comprising the following components present in the glass in the following mole percent ranges:

space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 35-46 B.sub.2 O.sub.3 22-28 BaO + SrO + CaO + ZnO 20-32 Al.sub.2 O.sub.3 + Y.sub.2 O.sub.3 0-3.5 La.sub.2 O.sub.3 + Nd.sub.2 O.sub.3 + Sm.sub.2 O.sub.3 + CeO.sub.2 1-11 As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3 0-1.5 ______________________________________

2. The glass composition of claim 1 further containing CaO which is present inn the glass in mole percent of about 6.5-7.3.

3. The glass composition of claim 1 further containing SrO which is present in the glass in mole percent of 10.2.

4. The glass composition of claim 1 further containing ZnO which is present in the glass in mole percent of about 2.6.

5. A microchannel plate made comprising substantially parallel surfaces wherein a plurality of glass fibers are fused together and the cores thereof are etched and extend between said parallel surfaces, said glass fibers being made from a core glass composition comprising the following components in the glass in the following mole percent ranges:

space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 35-46 B.sub.2 O.sub.3 22-28 BaO + SrO + CaO + ZnO 20-32 Al.sub.2 O.sub.3 + Y.sub.2 O.sub.3 0-3.5 La.sub.2 O.sub.3 + Nd.sub.2 O.sub.3 + Sm.sub.2 O.sub.3 + CeO.sub.2 1-11 As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3 0-1.5 ______________________________________

6. The microchannel plate of claim 5 wherein the glass composition further contains CaO which is present in glass in mole percent of about 6.5-7.3.

7. The microchannel plate of claim 5 wherein the glass composition further contains SrO which is present in the glass in mole percent of 0-3.

8. The microchannel plate of claim 5 wherein the glass composition further contains ZnO which is present in the glass in mole percent of about 2.6.

9. A cylindrically shaped, non-porous glass rod comprising a solid central area, said glass rod being formed of a glass composition having a transformation temperature in the range of about 637°

C. to about 654°

C. and a liquidus temperature below 1000°

C., said glass having a composition comprising the following components, present in the glass, in the following mole percent;

space="preserve" listing-type="tabular">______________________________________ SiO.sub.2 35-46 B.sub.2 O.sub.3 22-28 BaO + SrO + CaO + ZnO 20-32 Al.sub.2 O.sub.3 + Y.sub.2 O.sub.3 0-3.5 La.sub.2 O.sub.3 + Nd.sub.2 O.sub.3 + Sm.sub.2 O.sub.3 + CeO.sub.2 1-11 As.sub.2 O.sub.3 + Sb.sub.2 O.sub.3 0-1.5 ______________________________________

wherein the total mole percent of SiO₂ +B₂ O₃ +BaO is in the range of about 76 to about 96 and wherein said glass rod has an average lineal coefficient of thermal expansion in the range of about 74×

10^-7 per °

C. to about 91×

10^-7 per °

C. at a temperature between 25°

C. and 300°

C.

10. The cylindrically shaped non-porous glass rod of claim 9 wherein said glass composition further contains CaO which is present in the glass in mole percent of about 6.5-7.3.

11. The cylindrically shaped non-porous glass rod of claim 9 wherein said glass composition further contains SrO which is present in the glass in mole percent of about 10.2.

12. The cylindrically shaped non-porous glass rod of claim 9 wherein said glass composition further contains ZnO which is present in the glass in mole percent of about 2.6.