REINFORCED ROLL AND METHOD OF MAKING SAME
A method of one of manufacturing and maintaining a grinding roll comprises removably attaching an article adapted for use as a wear resistant working surface to an external surface a cylindrical core. The article includes a metal matrix composite comprising a plurality of inorganic particles dispersed in a matrix material comprising a metal or a metal alloy. The melting temperature of the inorganic particles is greater than the melting temperature of the matrix material. Hard elements are embedded in the metal matrix composite. The wear resistance of the metal matrix composite is less than the wear resistance of the hard elements, and the metal matrix composite wears away when the grinding roll is in use, thereby providing or preserving gaps between the hard elements at a working surface of the roll.
1 . A method of one of manufacturing a grinding roll and maintaining a grinding roll, comprising:
removably attaching an article in the form of one of a plate, a sheet, a cylinder, and a portion of a cylinder, to an external surface of a cylindrical core, the article adapted for use as at least a portion of a wear resistant working surface of a roll and comprising
a metal matrix composite comprising a plurality of inorganic particles dispersed in a matrix material comprising at least one of a metal and a metal alloy, a melting temperature of the inorganic particles being greater than a melting temperature of the matrix material, and
a plurality of hard elements interspersed in the metal matrix composite, wherein a wear resistance of the metal matrix composite is less than a wear resistance of the hard elements, and
wherein the metal matrix composite preferentially wears away when the article is in use, thereby providing or preserving a gap between the hard elements at the working surface.
2 . The method of claim 1 , wherein removably attaching the article to the external surface of the cylindrical core comprises one or more of mechanical damping, brazing, welding, and adhesively bonding the article to the external surface.
3 . The method of claim 1 , wherein the hard elements comprise at least one of a high hardness metal, a high hardness metal alloy, a sintered cemented carbide, and a ceramic material.
4 . The method of claim 1 , wherein each of the hard elements comprise at least one of a high hardness metal and a high hardness metal alloy.
5 . The method of claim 1 , wherein each of the hard elements comprises a tool steel.
6 . The method of claim 1 , wherein each of the hard elements comprises a ceramic material.
7 . The method of claim 6 , wherein each of the hard elements comprises at least one of: a silicon nitride reinforced with silicon carbide whiskers; and an aluminum oxide reinforced with silicon carbide whiskers.
8 . The method of claim 1 , wherein each of the hard elements comprises a sintered cemented carbide comprising particles of at least one carbide of a metal selected from Group IVB, Group VB, and Group VIB of the Periodic Table dispersed in a continuous binder comprising at least one of cobalt, a cobalt alloy, nickel, a nickel alloy, iron, and an iron alloy.
9 . The method of claim 1 , wherein the hard elements are spaced apart in the article in a predetermined pattern.
10 . The method of claim 1 , wherein each of the plurality of hard elements comprises a first end and a substantially equidistant opposed second end.
11 . The method of claim 10 , wherein the first end and the opposed second end of each of the plurality of hard elements are substantially planar and substantially parallel to each other.
12 . The method of claim 11 , wherein each of the plurality of hard elements comprises a cylindrical shape.
13 . The method of claim 1 , wherein the inorganic particles comprise at least one of a metal powder and a metal alloy powder.
14 . The method of claim 13 , wherein the inorganic particles comprise at least one of tungsten, a tungsten alloy, tantalum, a tantalum alloy, molybdenum, a molybdenum alloy, niobium, a niobium alloy, iron, an iron alloy, titanium, a titanium alloy, nickel, a nickel alloy, cobalt, and a cobalt alloy.
15 . The method of claim 1 , wherein the inorganic particles comprise hard particles.
16 . The method of claim 1 , wherein the inorganic particles comprise particles of at least one of a carbide, a boride, an oxide, a nitride, a silicide, a sintered cemented carbide, a synthetic diamond, and a natural diamond.
17 . The method of claim 1 , wherein the inorganic particles comprise at least one of: a carbide of a metal selected from Groups IVB, VB, and VIB of the Periodic Table; tungsten carbide; and cast tungsten carbide.
18 . The method of claim 1 , wherein the matrix material comprises at least one of copper, a copper alloy, aluminum, an aluminum alloy, iron, an iron alloy, nickel, a nickel alloy, cobalt, a cobalt alloy, titanium, a titanium alloy, a bronze alloy, and a brass alloy.
19 . The method of claim 1 , wherein the matrix material is a bronze alloy consisting essentially of 78 weight percent copper, 10 weight percent nickel, 6 weight percent manganese, 6 weight percent tin, and incidental impurities.
20 . The method of claim 1 , wherein the matrix material consists essentially of 53 weight percent copper, 24 weight percent manganese, 15 weight percent nickel, 8 weight percent zinc, and incidental impurities.
21 . The method of claim 1 , further comprising at least one machinable region bonded to the article by the metal matrix composite.
22 . The method of claim 21 , wherein the at least one machinable region comprises at least one of iron, an iron alloy, nickel, a nickel alloy, cobalt, a cobalt alloy, copper, a copper alloy, aluminum, an aluminum alloy, tantalum, and a tantalum alloy.
23 . The method of claim 21 , wherein the machinable region comprises particles of at least one material selected from iron, an iron alloy, nickel, a nickel alloy, cobalt, a cobalt alloy, copper, a copper alloy, aluminum, an aluminum alloy, tantalum, and a tantalum alloy; and wherein the particles are joined together by the matrix material.
24 . The method of claim 21 , wherein the machinable region is adapted for attaching the article to the external surface.
25 . A method of one of manufacturing a grinding roll and maintaining a grinding roll, the method comprising removably attaching an article in the form of one of a plate, a sheet, a cylinder, and a portion of a cylinder, to an external surface of a cylindrical core, wherein the article is adapted for use as at least a portion of a wear resistant working surface of a roll and comprises:
a metal matrix composite comprising a plurality of inorganic particles dispersed in a matrix material,
wherein the inorganic particles comprise at least one of tungsten, a tungsten alloy, tantalum, a tantalum alloy, molybdenum, a molybdenum alloy, niobium, a niobium alloy, iron, an iron alloy, titanium, a titanium alloy, nickel, a nickel alloy, cobalt, and a cobalt alloy,
wherein the matrix material comprises at least one of copper, a copper alloy, aluminum, an aluminum alloy, iron, an iron alloy, nickel, a nickel alloy, cobalt, a cobalt alloy, titanium, a titanium alloy, a bronze alloy, and a brass alloy, and
wherein a melting temperature of the inorganic particles is greater than a melting temperature of the matrix material; and
a plurality of hard elements comprising a sintered cemented carbide and interspersed in the metal matrix composite; and
wherein a wear resistance of the metal matrix composite is less than a wear resistance of the hard elements and the metal matrix composite preferentially wears away when the article is in use, thereby providing or preserving a gap between the hard elements at the working surface.