Boric acid free flux

Patent metadata

Field	Value
Publication number	US-10668576-B2
Application number	US-201715646026-A
Country	US
Kind code	B2
Filing date	Jul 10, 2017
Priority date	Mar 15, 2013
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

The invention described herein pertains generally to boric acid free flux composition in which boric acid and/or borax is substituted with a molar equivalent amount of potassium tetraborate tetrahydrate. In some embodiments, a phthalocyanine pigment is used to effect a color change at activation temperature.

First claim

What is claimed is:

1. A boric acid-free paste flux composition, comprising:
water;
potassium bifluoride;
a fumed silica;
potassium tetraborate tetrahydrate; and
potassium fluoroborate.

2. The boric acid-free paste flux composition of claim 1 , further comprising boron.

3. The boric acid-free paste flux composition of claim 2 , further comprising a wetting agent.

4. The boric acid-free paste flux composition of claim 3 , comprising approximately on the basis of the total weight of the boric acid-free paste flux composition:
the wetting agent in the amount of 0.1-1 weight %;
potassium bifluoride in the amount of 12-16 weight %;
the fumed silica in the amount of 0.1-4 weight %;
potassium tetraborate tetrahydrate in the amount of 26-35 weight %,
potassium fluoroborate in the amount of 26-35 weight %;
boron in the amount of 0.1-2 weight %; and
water in the amount of balance.

5. The boric acid-free paste flux composition of claim 4 , wherein the boric acid-free paste flux composition is a high temperature boric acid-free paste flux composition.

6. The boric acid-free paste flux composition of claim 1 , further comprising a wetting agent.

7. The boric acid-free paste flux composition of claim 6 , further comprising a pigment comprising phthalocyanine.

8. The boric acid-free paste flux composition of claim 7 , on the basis of the total weight of the boric acid-free paste flux composition:
the wetting agent in the amount of 0.1-1 weight %;
potassium bifluoride in the amount of 12-16 weight %;
the fumed silica in the amount of 0.1-4 weight %;
potassium tetraborate tetrahydrate in the amount of 26-35 weight %;
potassium fluoroborate in the amount of 26-35 weight %;
the pigment in the amount of 0.1-2 weight %; and
water in the amount of balance.

9. The boric acid-free paste flux composition of claim 8 , wherein the boric acid-free paste flux composition is a low temperature boric acid-free paste flux composition.

10. The boric acid-free paste flux composition of claim 1 , further comprising a pigment comprising phthalocyanine.

11. The boric acid-free paste flux composition of claim 10 , wherein the phthalocyanine pigment changes from colored to colorless at a temperature of approximately 500-600° C.

12. The boric acid-free paste flux composition of claim 1 , further comprising:
a pigment comprising phthalocyanine;
a wetting agent; and
boron.

13. The boric acid-free paste flux composition of claim 1 , wherein the boric acid-free composition comprises, on the basis of the total weight of the boric acid-free paste flux composition, one or more of the following amounts:
potassium bifluoride in the amount of 12-16 weight %;
the fumed silica in the amount of 0.1-4 weight %;
potassium tetraborate tetrahydrate in the amount of 26-35 weight %; and
potassium fluoroborate in the amount of 26-35 weight %.

14. The boric acid-free paste flux composition of claim 1 , further comprising a pigment.

15. The boric acid-free paste flux composition of claim 14 , wherein the pigment comprises phthalocyanine.

16. The boric acid-free paste flux composition of claim 1 , wherein the boric acid-free composition further comprises, on the basis of the total weight of the boric acid-free paste flux composition, a wetting agent in the amount of 0.1-1 weight %.

17. The boric acid-free paste flux composition of claim 1 , wherein the boric acid-free composition further comprises, on the basis of the total weight of the boric acid-free paste flux composition, boron in the amount of 0.1-2 weight %.

18. The boric acid-free paste flux composition of claim 1 , wherein the boric acid-free composition further comprises, on the basis of the total weight of the boric acid-free paste flux composition, a pigment in the amount of 0.1-2 weight %.

Assignees

• Lincoln Global Inc

Inventors

• Howard Robert A

Classifications

• B23K35/362 Primary

  Selection of compositions of fluxes (B23K35/365, B23K35/368 take precedence) · CPC title

• B23K35/00

  Rods, electrodes, materials, or media, for use in soldering, welding, or cutting · CPC title

• B23K35/3612

  with organic compounds as principal constituents · CPC title

• B23K35/3606

  Borates or B-oxides · CPC title

• B23K35/3601

  with inorganic compounds as principal constituents · CPC title