Cu-zn-mn-co (-ni) brazing alloys

Claim 1

The claims defining the invention are as follows:- 1. A brazing alloy comprising, apart from impurities, 10-45 wt.% zinc, 0.2-7.8 wt.% manganese, 0.2-10 wt.% cobalt and balance copper. 2. A brazing alloy according to claim 1, which includes 2---1--r-n-i-eei. 3. A brazing alloy according to claim 1 and consisting of 00 38 wt.% zinc, 2 wt.% manganese, 2 wt.% cobalt and 58 wt.% copper. t- 4. A cutting tool having at least one cutting tip or at a least one cutting insert secured to a shank of the tool by a brazing alloy as claimed in any one of claims 1 to 3. A rock drill comprising a steel shank, a groove in one end of said shank, a carbide cutting tip inserted in said groove, 4 the dimensions of said groove providing a joint gap between said tip and the walls of said groove and a brazing alloy as claimed in any one of claims 1 to 3 disposed in said joint gap and brazing the tip to the shank. 6. A rock drill according to claim 5 including two or more cutting tips. 0" 7. A rock d:-ill according to claim 5 or claim 6 wherein the an joint gap is not less than 0.004 inch. 8. A wire composed of the brazing alloy specified as No. 3 in Table 1 herein substantially as described. 9. A sheet composed of the brazing alloy specified as No. 3 in Table 1 herein substantially as described. DATED this sixth day of July, 1977. JOHNSON MATTHEY CO. LIMITED. S- 9 5/ p Fig.l. Fig'.2