MOLYBDENUM-Based Alloy

Abstract

Disclosed is an alloy based on molybdenum for industrial applications. The alloy exhibits minimal wear and good corrosion resistance in a high temperature range and can also be used in the event of poor lubrication of the components. The advantageous characteristics of the molybdenum-based alloy are based on the metallurgical structure with Laves phases and a novel material composition. The processing of the alloy can take place by various methods, such as casting, forging, sintering, welding or metal spraying and for producing components or also coatings.

1 . A Mo-based metallic Ni—Co—Cr—Fe—Mo alloy for the production of components, coatings and substrates, which in a high temperature range exhibits characteristics of low wear, corrosion resistance, oxidation resistance and minimised friction, wherein the metallic composition contains:
 Mo between 10% by weight and 60% by weight, 
 Cr between 10% by weight and 30% by weight, 
 Si between 0.5% by weight and 5.0% by weight, 
 Fe between 10% by weight and 30% by weight, 
 Co between 10% by weight and 40% by weight, 
 Ni between 10% by weight and 40% by weight, 
 Mn up to 2.0% by weight, 
 Mn up to 2.0% by weight, and 
 further constituents up to 4% by weight. 
 
     
     
         2 . The metallic alloy according to  claim 1 , wherein the metallic composition contains an individual element, a plurality of or all of the elements mentioned below in the respectively stated range of proportion by weight:
 Mo between 22% by weight and 38% by weight,   Cr between 13% by weight and 17% by weight,   Si between 1.5% by weight and 4.5% by weight,   Fe between 13% by weight and 17% by weight,   Co between 17% by weight and 23% by weight,   Ni between 17% by weight and 23% by weight,   Mn up to 0.8% by weight,   C up to 1.40% by weight, and   further constituents up to 3% by weight.   
     
     
         3 . The metallic alloy according to  claim 1 , wherein the metallic composition contains an individual element, a plurality of or all of the elements mentioned below in the respectively stated range of proportion by weight:
 Mo between 26% by weight and 28% by weight,   Cr between 14% by weight and 16% by weight,   Si between 2.5% by weight and 3.5% by weight,   Fe between 14% by weight and 16% by weight,   Co between 18% by weight and 22% by weight,   Ni between 18% by weight and 22% by weight,   Mn up to 0.7% by weight,   C up to 0.1% by weight, and   further constituents up to 2.2% by weight.   
     
     
         4 . The metallic alloy according to  claim 1 , wherein a ratio of Mo to Si is selected from the group consisting of between 5 and 14, between 6 and 13, and between 7.5 and 11.5. 
     
     
         5 . The metallic alloy according to  claim 1 , wherein the proportion of P and S in the alloy is in each case selected from the group consisting of up to 0.1% by weight, up to 0.06% by weight, and up to 0.03% by weight. 
     
     
         6 . The metallic alloy according to  claim 1 , wherein the proportion of Ti, Ta, Hf and other trace elements in the alloy is in each case selected from the group consisting of up to 0.4% by weight, up to 0.2% by weight, and up to 0.1% by weight, and/or the total proportion of Ti, Ta, Hf and other trace elements in the alloy is selected from the group consisting of up to 2% by weight, up to 1.5% by weight, and up to 1% by weight. 
     
     
         7 . The metallic alloy according to  claim 1 , wherein the proportion of Al in the alloy is selected from the group consisting of up to 0.75% by weight, up to 0.5% by weight, and up to 0.25% by weight. 
     
     
         8 . The metallic alloy according to  claim 1 , wherein the proportion of B in the alloy is selected from the group consisting of up to 0.3% by weight, up to 0.2% by weight, and up to 0.1% by weight. 
     
     
         9 . The metallic alloy according to  claim 1 , wherein the melting range is selected from the group consisting of from 1050 to 1450° C., from 1100 to 1400° C., and from 1170 to 1350° C. 
     
     
         10 . The metallic alloy according to  claim 1 , wherein the proportion of Laves phases in the alloy is selected from the group consisting of from 50 to 85% by volume, from 60 to 80% by volume, and from 65 to 75% by volume. 
     
     
         11 . The metallic alloy according to  claim 1 , wherein the hardness is selected from the group consisting of between 42 and 54 HRC, between 45 and 52 HRC, and between 47 and 49 HRC. 
     
     
         12 . The metallic alloy according to  claim 1 , wherein the coefficient of friction u of the alloy, measured with a ball on disc tribometer, is selected from the group consisting of between 0.06 and 0.30, between 0.100 and 0.150, and between 0.110 and 0.130. 
     
     
         13 . The metallic alloy according to  claim 1 , wherein the density is selected from the group consisting of between 7 g/cm 3  and 9 g/cm 3 , between 7.5 g/cm 3  and 8.5 g/cm 3 , and between 7.8 g/cm 3  and 8.2 g/cm 3 . 
     
     
         14 . The metallic alloy according to  claim 10 , wherein the proportion of Laves phases, the hardness, the coefficient of friction and/or the density is achieved by a casting production process without further heat treatment. 
     
     
         15 . The metallic alloy according to  claim 11 , wherein the proportion of Laves phases, the hardness, the coefficient of friction and/or the density is achieved by a casting production process without further heat treatment. 
     
     
         16 . The metallic alloy according to  claim 12 , wherein the proportion of Laves phases, the hardness, the coefficient of friction and/or the density is achieved by a casting production process without further heat treatment. 
     
     
         17 . The metallic alloy according to  claim 13 , wherein the proportion of Laves phases, the hardness, the coefficient of friction and/or the density is achieved by a casting production process without further heat treatment. 
     
     
         18 . A method for producing an alloy, comprising the following steps:
 a) supplying raw material/base materials to a furnace, wherein the raw materials/base materials contain at least the elements with the corresponding percentages by weight of the total weight of the alloy according to  claim 1 , and   b) heating of the raw material to a temperature of 1600° C. or higher.   
     
     
         19 . The method for producing an alloy according to  claim 18 , which optionally contains one or more of the following additional steps:
 c) holding time for the temperature of at least 60 seconds,   d) deslagging,   e I) casting at a temperature>1600° C. in the case of centrifugal casting and/or sand casting, and   e II) casting at temperature>1500° C. in investment casting and/or resin shell casting, wherein the shell temperature in investment casting is selected from the group consisting of between 700 and 1200° C., and between 850 and 1050° C.,   and wherein the shell is not heated in advance in the case of resin shell casting, centrifugal casting and/or sand casting.   
     
     
         20 . The method according to  claim 18 , wherein the step b) takes place in an atmosphere of argon (Ar). 
     
     
         21 . The method according to  claim 19 , wherein step c) takes place in an atmosphere of argon (Ar).