Composite for wear-resistant ring having excellent heat conductivity
A wear-resistant ring and composite technology, applied in piston rings, mechanical equipment, engine components, etc., can solve the problem of low wear resistance of aluminum alloys, and achieve the effect of promoting light weight, excellent strength and high thermal conductivity
Active Publication Date: 2018-01-19
HONDA MOTOR CO LTD
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Problems solved by technology
However, the wear resistance of aluminum alloy is lower than that of conventional cast iron, and it is required to improve the wear resistance of the engine made of aluminum alloy, especially for the sliding part that slides at high temperature
Method used
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[0070] In the pure iron powder adjusted to pass through a 60-mesh sieve and not pass through a 350-mesh sieve as an iron-based powder, Cu powder, graphite powder, Alternatively, powders for dispersed particles of the types shown in Table 1 were further blended, and lubricant particle powders were blended in the blending amounts (parts by mass) shown in Table 1, and mixed with a mixer to prepare mixed powders. In addition, the average particle diameter of graphite powder, Cu powder, and the powder for dispersed particles shall be 150 micrometers or less.
[0071] The obtained mixed powder was put into a mold, and formed into a ring-shaped green compact (outer diameter 90 mmφ×inner diameter 60 mmφ×wall thickness 5 mm) by molding and pressing. Next, a sintering treatment was performed on the obtained green compact to produce an iron-based sintered compact for wear-resistant rings. In addition, the sintering treatment is performed at a temperature in the range of 1000°C to 1200°C...
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Abstract
Provided is a composite for a wear-resistant ring having excellent heat conductivity. In the composite for a wear-resistant ring, an iron-based sintered body for a wear-resistant ring having a composition that contains 0.4-1.5% C and 20-40% Cu in mass%, and having a structure in which pores exist continuously at a porosity of 15-50% in terms of volume fraction, and in which the base material is pearlite and has dispersed therein a free Cu phase or, in addition thereto, dispersion particles, is insert-casted using an aluminum alloy to cause the aluminum alloy to permeate the pores. As a result,the composite for a wear-resistant ring obtains excellent heat dissipation properties since having a thermal conductivity of 40 W / m / K or more, a radial crushing strength of 300 MPa or more, a linearexpansion coefficient of 13.6-16.9*10-6 / K, and a boundary strength sigma with respect to the aluminum alloy is 1.5 times or higher than the boundary strength sigmaE with respect to an aluminum alloy obtained when a wear-resistant ring of Ni-resist cast iron is insert-casted, is prevented from peeling off during production and actual use, and obtains excellent high-temperature wear-resistant properties and excellent heat conductivity.
Description
technical field [0001] The invention relates to an iron-based sintered body suitable for use as a wear-resistant ring used in internal combustion engines such as automobiles, in particular to an iron-based sintered body for a wear-resistant ring cast and wrapped in an aluminum alloy for a wear-resistant ring Complex. Background technique [0002] In recent years, from the standpoint of protecting the global environment, there has been a strong desire to improve the fuel efficiency of automobiles and the like. Due to this expectation, the weight reduction of the engine has been developed, and the engine made of aluminum alloy is becoming popular. However, aluminum alloys have low wear resistance compared to conventional cast irons, and for engines made of aluminum alloys, improvements in wear resistance are required especially for sliding parts that slide at high temperatures. [0003] To solve this problem, aluminum alloys with a structure in which a wear-resistant ring ma...
Claims
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IPC IPC(8): B22F3/26B22F5/02C22C33/02C22C38/00
CPCB22F3/26B22F5/02B22F7/008C22C27/04C22C33/0278C22C38/16F16J9/26C22C38/00
Inventor 滝口寛青木敦也若林亮生友良平谷畑昭人
Owner HONDA MOTOR CO LTD