In order for the working status of the aluminum alloyed hydraulic valve body to be controlled in actual conditions, a new friction and wear
design device was designed for the cast iron and aluminum alloyed valve bodies comparison under the same conditions. The results
displayed that: (1) The oil leakage of the aluminum alloyed hydraulic valve body was higher than the corresponding oil leakage of the iron
body during the initial running stage. Besides during a later running stage, the oil leakage of the aluminum alloyed body was lower than
corresponding oil leakage of the iron body; (2) The actual oil leakage of different materials consisted of two parts: the foundation leakage
that was the leakage of the valve without wear and wear leakage that was caused by the worn valve body; (3) The aluminum alloyed valve
could rely on the dust filling furrow and melting mechanism that led the body surface to retain dynamic balance, resulting in the valve
leakage preservation at a low level. The aluminum alloy modified valve body can meet the requirements of hydraulic leakage under
pressure, possibly constituting this alloy suitable for hydraulic valve body manufacturing.
The friction and wear properties of 201HT aluminum alloys and the corresponding competitive coupons were tested on an electrohydraulic
servo face friction and wear testing machine (MM-U10G). The microstructures of the competitive coupons were investigated by
scanning electron microscopy (SEM) and consequently the corresponding friction and wear mechanisms were studied. The results
demonstrated that: (1) the best competitive material of friction and wear performance of the 201HT was the 201HTC. (2) the 201HTC
modified by carbon following the initial mill for oil storage of the micro-groove to be produced, increased the corresponding lubrication
performance reduced the friction coefficient and wear rate effectively. (3) the 201HT-201HTC could obtain both better friction and wear
mainly due to the initial process of grinding following the 201HT plastic deformation occurred in the surface and the formation of a series
of re-melting welding points, whereas the 201HT material hardness would be similar to the 201HTC material hardness, which led into the
competitive material friction and wear performance improvement.