Method for producing an integral bond between components of quartz glass and heating burner suited therefor

Patent metadata

Field	Value
Publication number	US-10947146-B2
Application number	US-201816021294-A
Country	US
Kind code	B2
Filing date	Jun 28, 2018
Priority date	Jun 30, 2017
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

Known heating burners for producing a welded joint between components of quartz glass include a burner head in which at least one burner nozzle is formed, a burner-head cooling system for the temperature control of the burner head and a supply line connected to the burner nozzle for a fuel gas. Starting from this, to modify a heating burner in such a way that impurities in the weld seam between quartz-glass components to be connected are largely avoided, it is suggested that the burner head should include a base body of silver or of a silver-based alloy.

First claim

What is claimed is:

1. A method for producing an integral bond between connection surfaces of components of quartz glass, comprising:
heating and softening the connection surfaces by way of at least one heating burner;
pressing the connection surfaces against each other to form a component assembly having a weld seam; and
cooling the component assembly,
wherein the heating burner has a burner head, said burner head comprises a base body of silver or of a silver-based alloy, in said base body at least one burner nozzle is designed as a tubular insertion part of silver or of a silver-based alloy, that is inserted into a through hole in the base body, said burner nozzle is connected to a supply line for a fuel gas or a fuel gas mixture, and wherein said base body is provided for temperature control with a burner-head cooling system, wherein in said burner-head cooling system two cooling water pipes for the cooling water supply and cooling water discharge are connected to each other via a fluidically continuous cooling channel.

2. The method of claim 1 , wherein the silver content of the base body of the burner head is at least 90% by wt.

3. The method of claim 1 , wherein the silver content of the base body of the burner head is at least 99% by wt.

4. The method of claim 1 , wherein the heating burner has a polished burner mouth facing the connection surfaces.

5. The method of claim 1 , wherein a connection between the burner nozzle and the gas supply line is designed as a detachable positive connection.

Assignees

• Heraeus Quarzglas

Inventors

• Ganz Oliver

Classifications

• C03B2201/02

  Pure silica glass, e.g. pure fused quartz · CPC title

• C03B20/00

  Processes specially adapted for the production of quartz or fused silica articles {, not otherwise provided for (C03B19/01, C03B19/066, C03B19/106, C03B19/12, C03B19/14, C03B37/00 take precedence)} · CPC title

• C03B23/20 Primary

  Uniting glass pieces by fusing without substantial reshaping · CPC title

• C03B37/01257

  Heating devices therefor · CPC title

• C03B23/043

  Heating devices specially adapted for re-forming tubes or rods in general, e.g. burners · CPC title