DE1919234A1 - Sintered material based on aluminum for the manufacture of machine parts subject to sliding stress - Google Patents

Description

KAHL SCfMTDT ¹ CiTBH Frankfurt (Main), April 2, 196P

DrQ / GKp 7107 Neckarsulm

■■! »'■"

prov. No. 6084 KS

Sintered material based on aluminum for production machine parts subject to sliding stress

The invention relates to a sintered material produced by powder metallurgy and subject to sliding stress, which according to the main patent ..... (patent application P 17 58 007.3) from 3 vol -. # copper, 0.5 "to 5 vol. $ preferably 0.5 to 2 vol. $ Aluminum oxide and the remainder aluminum is. The relatively small amount of copper added results in good starting friction and a sufficiently long service life. The aluminum oxide added in small amounts causes an increase in wear resistance at the same time Reduction of the movement friction.

It has now been found that the running behavior - characterized in the present case by the wear resistance, the running time, the initial friction and the dynamic friction of the Slidably stressed sintered material of the above composition is significantly improved and thus the requirements is more appropriate to modern vehicle technology,

if the sintered material according to the main patent

(Patent application P 17 58 007.3) according to the invention still lead is added in an amount of 0.5 to 4 Vol. ^, preferably within the limits of 0.5 to 2.0 Vol. ^.

In this way it is achieved that the sintered material according to the invention compared to the sintered material after

^! Main patent (patent application P 17 58 007.3) a

$ 31 to $ 35> lower wear and tear, characterized by

00 9848 / QS26

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the abrasion in mra / h and the running time, as l! nß. for the sensitivity with which the sliding material responds to disturbances, is increased by 10 to 15 tf . Characterized slide movement friction ALSF friction between relatively moving surfaces lot, .v / ird un 10 to 15 i "and reduces the static friction, caused by the attacking the transition from Ruhereibimg for moving friction torque, up to 5 ° fa. A particular advantage also results from the fact that the tools for non-cutting and cutting shaping are subject to much less wear, so that a multiple of the service life that has been customary up to now is achieved.

The column charts shown in the drawing that in detail information about the different running modes holding a sintered material subject to sliding stress according to the main patent ...... (patent application P 17 58 007.3) and to give the sintered material according to the invention are explained in more detail with reference to two exemplary embodiments. .

example 1

The unhatched bar graphs relate to a powder mixture with the composition 96.5 vol. Aluminum with a grain size of less than 200 μm, 3 vol. Copper with a grain size between −90 and 33 μm and 0.5 vol. Al ₂ O , with a grain size of less than 1.0 µm according to the main patent. »... (patent application P 17 58 007.3), which were cold-pressed at a pressure of 1.2 t / cm to form moldings of 8 mm in diameter and 8 mm in height Shaped bodies were sintered at a temperature of 600 ° C. and soaked with oil after they had been cold-er- * The running behavior of the sintered body was determined with the aid of a friction coefficient tester.

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!] inc such. The testing machine consists in detail of a disc of 21U mm diameter, inclined by 30 degrees to the horizontal, made of insert - / - e.hu-'tetPin steel aln Gejenwerkstoi'f, which is set in rotation by an electric motor. Above the hub of the disc, a pendulum is movably arranged in a bearing, to which the cylindrical sintered material sample is attached to the face of the disc . Il-ach dom The sin1 er material sample loaded with 20 kg / cm is placed on the disc, this is first of all 'i'ind. -Odr' ht, whereby the pendulum carrying the sintered material is no longer deflected by the static friction until e 'through Overcoming the friction at rest falls back into its AusfmnfjRHtellxmfi. 7) icse maximum pendulum deflection irA a rift for the initial friction. After the Pe; -3tiinmun ,; (i ^ra r Anl ^r ufrieb v. ^f ir-i the testing machine for the given b'Mif! - rufEeii von Biituivipn in Rotation Vers et st and the jio-.vogunfsampf über o <η Hebclfiuosohlag der? Pendels rnfTistriort. After the end of the running time, the testing machine is shut down and the wear of the sintered material sample is measured on its decrease in height.

Bio assessment of wear and tear, the running time, the start-up friction ur.l <ter Bev / egxmgsreibunc "takes place according to relative Gütewei-tPii, .. sorted from 1 to 10 in ascending order, the reason dfT · determined absolute values for the various characteristics the running behavior are set up.

Example 2

The hatched bar charts relate to a powder mixture according to the invention, consisting of 94.5 vol.? p

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Aluminum with a grain size of less than 200 µm »5.0. Copper with a grain size of between 90 and 53 µm» 0.5 YoI. $ Al ₂ O * with a grain size of Irleiner 1.0 do and 2.0 VbI. $. Lead with a grain size of less than 53 is put together "The powder mixture is carried out under the same procedural conditions as in the execution1) example 1 νΑ ^^. ^ 11Φ ₉ ; ^: £ & 1 ^; 0ρ? 0βϊΐΊΐ | & ά, sintered and then the running behavior of the manufactured 0interkÖriper determined with the help of the described friction value testing machine «

Bine comparative (regenttberstellering of the bar charts of the two execution games with regard to the Run behavior in the characteristic fferktoale violated that the produced from the powder mixture according to the invention Sintered material in its running behavior to the sintered material according to the main patent .. · ,. {Patent application P 17 58 007.5) is clearly «berlögea.

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Claims (2)

PATENT CLAIMS 1,) Sintered material produced by powder metallurgy on sliding "stressed aluminum base" with additions of 3 ο \ * $> copper and 0.5 Ms 5 vol.JA 'preferably 0.2 to 2% aluminum oxide according to the main patent. «». (Patent application P 17 58 007 * 3), gekennsselohnet. by a Eusatz of 0.5 Ma 0.5 to 4, preferably Z Vol. it lead " 2.) Ginter material produced by powder metallurgy according to claim t, characterized thereby, the Grain size of lead powder Klöiner 33 pm Blank page BATH