Preparation Process of an Aluminum-chromium Alloy Cylinder Liner
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.