The Abrasive Wear of Alumina Matrix Particulate Composites at Different Environments of Work

2007 ◽  
Vol 29-30 ◽  
pp. 283-286 ◽  
Author(s):  
Zbigniew Pędzich
Keyword(s):  
Silicon Carbide ◽  
Abrasive Wear ◽  
Work Environment ◽  
Yttria Stabilized Zirconia ◽  
Particulate Composites ◽  
Alumina Matrix ◽  
Stabilized Zirconia ◽  
Abrasive Medium ◽  
Miller Test ◽  
Conditions Of Work

The paper presents the results of investigation on the wear of alumina-based composites containing submicrometre particles of other phases in different conditions of work. Three types of phases were used as additives: tungsten carbide, yttria stabilized zirconia and metallic tungsten. The above mentioned phases were used separately or simultaneously as mixes. Two types of tests were performed - the Dry Sand Test and the Miller Test in wet pulp. Coarse silicon carbide grains were used as an abrasive medium in both cases. The results indicate that the optimal wear susceptibility in given work environment could be achieved by the addition of different type of additives.

The Wear of Alumina Matrix Particulate Composites at Different Environments

2006 ◽  
Vol 45 ◽  
pp. 142-147 ◽  
Author(s):  
Zbigniew Pędzich ◽  
Rafał Cheliński
Keyword(s):  
Silicon Carbide ◽  
Tungsten Carbide ◽  
Work Environment ◽  
Particulate Composites ◽  
Alumina Matrix ◽  
Abrasive Medium ◽  
Abrasive Particles ◽  
Miller Test ◽  
Dry Sand

Paper presents the results of investigation on wear of alumina and alumina-basing particulate composites by hard abrasive particles in different environments. The results of two tests (The Dry Sand Test and the Miller Test in pulp) were compared. As an abrasive medium coarse silicon carbide grains were used in both cases. The alumina microstructure was modified by different inclusions: zirconia, tungsten carbide, metallic tungsten and their mixtures. The results indicate that the optimal wear susceptibility in given work environment could be achieved by the addition of different type of additives.

Wear Resistance of 18%Cr-9%Ni Steel Used for Cast Parts of Pumps Operating in Corrosive – Erosive Environments

2013 ◽  
Vol 58 (3) ◽  
pp. 841-844
Author(s):  
B. Kalandyk
Keyword(s):  
Wear Resistance ◽  
Titanium Nitride ◽  
Abrasive Wear ◽  
Cast Steel ◽  
Experimental Studies ◽  
Abrasive Wear Resistance ◽  
Test Cycle ◽  
Abrasive Medium ◽  
Miller Test ◽  
Cast Parts

Abstract This paper presents the results of experimental studies, the main aim of which has been to demonstrate that changes in the microstructure of austenitic 18%Cr-9%Ni cast steel provoked by the addition of 1.4% boron, and boron with titanium, give increased wear resistance. After melting the high-alloyed 18%Cr-9%Ni cast steel with an addition of boron, and boron with titanium, metallographic examinations were conducted using light microscopy and SEM. These examinations revealed in the austenitic structure of the 18%Cr-9%Ni cast steel, the presence of a eutectic rich in boron and chromium, and characterised by a microhardness of 1838-1890 μ HV20. Additionally, in the cast steel inoculated with boron and titanium, the presence of titanium nitride precipitates was observed. Changes that have occurred in the microstructure as a result of introducing the additions of boron, and boron with titanium, also caused an increase of the cast steel hardness from 212 HV30 to 290-320 HV30 and 320-350 HV30, respectively. To determine the abrasive wear resistance, 16-hour Miller test was performed (ASTM G 75-07), wherein the abrasive medium was a mixture of SiC and water. Obtaining the hard, rich in boron and chromium, eutectic and titanium nitride precipitates in the structure of 18%Cr-9%Ni cast steel increased the abrasive wear resistance by approximately 21%, according to the data recorded in the sixteenth hour of the test cycle. As an additional benchmark point for the results obtained served the wear resistant, structural, L35GSM steel used for castings working in difficult conditions. Comparing the values of abrasive wear resistance obtained for the 18%Cr-9%Ni cast steel and cast L35GSM steel, an increase in the wear resistance of the 18%Cr-9%Ni cast steel by about 35% has been proved.

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