Preparation Process of an Aluminum-chromium Alloy Cylinder Liner

Abstract

The invention relates to an aluminum complex alloy cylinder liner preparation process. The raw materials can be vacuum dried and put into a high-speed rolling ball mill for 20-80 hours, before being ground and sieved at 200 mesh. The sieved material can then be mixed with purified water in a stirring mill and stir for 1-4 hours, while a 0.5-2 wt % dispersant and binder are added, to produce a solid content that is a stable slurry of 60-70 wt %. The stable slurry can be dried and granulated into an average particle size of 100-200 mesh. The granulated powder can then be cold isostatic pressed in a mold to form a tube-shaped alloy blank, wherein the molding pressure is 130-250 MPa, and the holding time is 1-10 minutes, high temperature vacuum sintering of the alloy blank, sintering temperature 1500-1600 degrees, heat preservation 3-6 hours, and vacuum degree controlled at −0.098 MPa.

1 . An aluminum-chromium alloy cylinder liner preparation process comprising
 combining raw materials, said raw materials comprising
 an industrial alumina coarse powder as a base, the content at 50-80 wt % and its particle size between 2-10 microns 
 a high temperature Calcined and crushed alumina fine powder the content at 5-20 wt % and its particle size between 0.5-1.5 microns, 
 an 800 mesh zirconite powder at 1-10 wt %, 
 an 800 mesh metal tungsten powder 0.2-2 wt %, 
 an 800 mesh talc powder 0.2-2 wt %, 
 an 800 mesh metal chromium powder 0.2-2 wt %, 
 an 800 metal manganese powder 0.2-2 wt %, 
 an 800 mesh metal nickel 0.2-2 wt %, and 
 an 800-900 mesh bentonite 0.2-2 wt %; 
   said combining raw materials as follows:
 vacuum drying the raw materials, 
 rolling said raw materials in a ball mill for 20-80 hours, 
 milling the raw materials using a 200-mesh sieve to produce a sieved material 
 mixing said sieved material and purified water in a stirring mill 
 stirring said sieved material and said purified water for 1-4 hours, and 
 adding 0.5-2 wt % dispersant and binder during the 1-4 hours of stirring to form a slurry, and the slurry is aged and defoamed to prepare a stable slurry with a solid content of 60-70 wt %. 
   
     
     
         2 . The method of  claim 1  further comprising the steps of
 drying and granulating said stable slurry into a granulated powder having an average particle size of 100-200 mesh, fluidity of 30-40 seconds, bulk density of 1.0-1.8 g/cm3, and moisture content of 0.4-1 wt %. 
 
     
     
         3 . The method of  claim 2  further comprising the steps of
 cold isostatic pressing said granulated powder in a mold to make a tubular alloy blank, in which a forming pressure is 130-250 MPa and the holding time is 1-10 minutes; and 
 subjecting said alloy blank to a high temperature vacuum sintering at a sintering temperature of 1500-1600 degrees, heat preservation for 3-6 hours, and vacuum degree controlled at −0.098 MPa, to form an allow tube. 
 
     
     
         4 . The method of  claim 3  further comprising the steps of
 processing the outer circle and both ends of said alloy tube ( 2 ) by sintering, and placing the alloy tube ( 2 ) into a metal jacket ( 1 ) that has been preheated and expanded. 
 
     
     
         5 . The method of  claim 4  further comprising the steps of rough grinding and polishing the inner circle of the alloy tube. 
     
     
         6 . The method of  claim 5  wherein the interference between said alloy tube ( 2 ) and said metal jacket ( 1 ) is 0.10-0.70 mm, the assembly temperature between the alloy tube ( 2 ) and said metal jacket ( 1 ) is 300-600 degrees, and a heat preservation time is 1-6 hours. 
     
     
         7 . The method of  claim 5 , wherein
 the content of said industrial alumina coarse powder is 65 wt % and the average particle size of said industrial alumina course powder is 6 microns,   the content of said alumina fine powder is 20 wt % and the average particle size of said alumina fine powder is 0.8 microns,   the content of said 800 mesh zirconite powder is 8 wt %,   the content of said 800 mesh metal tungsten powder is 1 wt %,   the content of said 800 mesh talc powder 1.5%,   the content of said 800 mesh metal chromium powder is 1 wt %,   the content of said 800 mesh metal manganese powder 1 wt %,   the content of said 800 mesh metal nickel powder 1 wt %, and   the content of said 800 mesh bentonite is 1.5 wt %.   
     
     
         8 . The method of  claim 7  wherein said raw materials are rolled in said ball mill for 50 hours. 
     
     
         9 . The method of  claim 8  wherein said sieved material and said purified water are stirred for 2 hours. 
     
     
         10 . The method of  claim 9  wherein the content of said dispersing agent and binder is 2 wt %. 
     
     
         11 . The method of  claim 10  wherein said stable slurry comprises a solid content of 65 wt %. 
     
     
         12 . The method of  claim 11  wherein said granulated powder has an average particle size of 200 mesh, a fluidity of 38 seconds, a bulk density of 1.4 g/cm3, and a moisture content of 0.7 wt %. 
     
     
         13 . The method of  claim 12  wherein the said forming pressure is 180 MPa and said holding time is 8 minutes, said sintering temperature is 1550 degrees, said heat preservation 4 hours, and said vacuum is controlled at −0.098 MPa. 
     
     
         14 . The method of  claim 6  wherein said metal jacket is 0.45 mm. 
     
     
         15 . The method of  claim 14  wherein the assembly temperature between said alloy tube and said metal jacket is 480 degrees, and said holding time is 4 hours. 
     
     
         16 . The method of  claim 3  wherein said mold is rubber. 
     
     
         17 . The method of  claim 3  wherein said mold is plastic. 
     
     
         18 . The method of  claim 3  wherein said mold is metal. 
     
     
         19 . The method of  claim 1  wherein said bentonite is 800-mesh bentonite. 
     
     
         20 . The method of  claim 1  wherein said bentonite is 900-mesh bentonite.