Abstract An electrode useful for electrowinning and other processes including evolution of oxygen or chlorine or for plating is formed of titanium particles, compacted cold, and coated and cemented with a first layer of manganese dioxide thermally deposited from Mn (NO3)2 on the grains to form a coating of a combination of manganese dioxide and titanium oxide having a rutile crystal structure, and a further outer layer of manganese dioxide which is electrodeposited, the two coatings not being limited to the surface of the electrode but extending to all exposed surfaces of the grains including those which are walls of channels between the grains. The compression of the titanium powder is to a density between 30 and 70 percent of the density of solid metal. Solid metal such as metal mesh may be included in the titanium powder prior to compacting, such as expanded titanium metal, to assist in strengthening the form. In an alternate embodiment the metal substrate is lead.
AN ELECTRODE FORMED FROM COMPACTED METAL PARTICLES COMPRISING TITANIUM, THE GRAINS BEING COVERED WITH A FIRST LAYER OF MNO2 DEPOSITED BY THERMAL DECOMPOSITION OF MN (NO3)2 THE PARTICLES BEING FURTHER COVERED WITH AN OUTER LAYER OF MAGANESE DIOXIDE, AN EXTENSIVELY INTERCONNECTED PORE SYSTEM BEING BETWEEN THE COMPACTED PARTICLES, THE PARTICLES BEING COMPACTED ALONG WITH AT LEAST ONE SOLID METAL REINFORCEMENT TO INCREASE THE MECHANICAL STRENGTH OF THWE ELECTRODE.
Claim 2
Dependent Claim
68 words
AN ELECTRODE FORMED FROM COMPACTED METAL PARTICLES COMPRISING TITANIUM, THE GRAINS BEING COVERED WITH A FIRST LAYER OF MNO2 DEPOSITED BY THERMAL DECOMPOSITION OF MN (NO3)2 THE PARTICLES BEING FURTHER COVERED WITH AN OUTER LAYER OF MAGANESE DIOXIDE, AN EXTENSIVELY INTERCONNECTED PORE SYSTEM BEING BETWEEN THE COMPACTED PARTICLES, THE PARTICLES BEING COMPACTED ALONG WITH AT LEAST ONE SOLID METAL REINFORCEMENT TO INCREASE THE MECHANICAL STRENGTH OF THWE ELECTRODE.
Claim 3
Dependent Claim
16 words
The electrode of claim 1 in which the particles are cemented together by the first layer.
Claim 4
Dependent Claim
43 words
The electrode of claim 1 in which the particles are titanium having sizes predominantly between 100 mesh and 325 mesh, the particles being compacted to between 30 and 70 percent of the density of the solid metal of which the particles are composed.
Claim 5
Dependent Claim
40 words
The electrode of claim 1 in which the particles are titanium with a titanium oxide surface film and in which the first layer contAins atoms from the surface film and thereby comprises a mixture of titanium oxide and manganese dioxide.