DE1558654A1 - Sintered iron alloy and process for its manufacture - Google Patents

Description

DipK-lng. August Soshart on η

DIpUn ^. Wßlier Jackisch.

Patent attorneys Stuff gort'H Menzefefraße Üs · - ■ = ---.,. '' ■

Swabian steelworks © A 30 09β- sz

Sintereisenleglermig and procedure for their manufacture

The invention uea. Look up. Sintered alloys with Hoham Elastisltätsmoclul and on ®in procedure for Production of such sintered iron alloys.

Such alloys are first coated in powder form and in star & sxi presses to compacts, =, @rtin <£ Ling @ ng @ f03.1nt _o liisae are then in a d © r with. Atmföspliiir® is filled, thereby

e Daae si © üblicharwels® exposed to a temperature wa 1150 hie 1200 ⁰ O outgassing © be tst for about 30 bia 45 min.. B @ i diaser ls? T the processing it results »that sintered iron alloys

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a microstructure with a more or less have a large number of pores «These pores have a considerable influence on the elasticity model of the sintered iron. The more pores there are, i.e. the lower the specific weight of the sintered iron produced, the lower becomes its modulus of elasticity.

The invention is based on the

Realizing that at

With the same specific weight, the modulus of elasticity becomes greater, ie the more rounded the shape of the pores in the sintered iron is. This is a consequence of the internal notch effect of the pores. This notch effect can be expressed with a dimensionless notch effect B number m * _j "5? _ ^ .

In this equation, E " _{o is} the modulus of elasticity of the examined sintered alloy based on the elasticity diode of the associated compact metal and J" is the specific gravity J * of the sintered alloy

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on the specific weight of the sintered alloy used compact metal. Ss is alao "with one Sintered iron alloy

and

'jo steel'

If a sintering solution is carried out in the usual manner indicated above. is processed and thereby for a Sinterzßit. from 50 "to 45 minutes a.? sinter tompejretur of 1150 bio 1200 ⁰ C is subjected to, so achieves a,! fet for di.6 Kerijw'.rkungasahl m ^

see 2, 5 and 2.75. Han iet n \ xa l> e-3trebt _f the Kerbwirlaingsjsahl m possible to lower, because then with the same specific weight of the flow rate mcdul E ₀ the Siu Btie5,1; Ut..iiaöaula could inen the alloy very long _f 'namely

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about more ale; 2 hours and bsw. or at very high 2emps3? <r.turGn sv / iechen 1250 to 135O ⁰ C; sinter. This can be about 2.0 lying values for Kerbv / m irkungasjahl achieve · This path, however, is not economical because it requires high _P Eaergiekosten and increased production time.

The invention addresses the problem sugTfcnde a Sintereisenlegieruxxg for Hei? Freellung to create moldings that "at a Yftlxmebehandlung in the temperature range ßwisohon 1150 bit 120Oo and among ordinary Sintorzeiten of about 30 to 45 minutes good abger-undete Pnrim and d.emwifolge öinen high

zii.ätrsmodnl gives the öintex-elaenii. According to the invention, this can be achieved by converting the sintered ice cream into a strongly deaoxidizing agent. ; <yemg <j from 0 _t 001 to 1 J ', preferred

from * ' ¹ Ma 0 _? 7 f> P.; ugeniiaoht will. IlLb des-

07fidient active ingredients. Mainly the elements & iu. ¹ IDjjdla'.kal.L- νηά ! •; / drnöti ⁱ .ll, '5: euppen _p i special Eelsiuoi, Ii «gn-93.ium ut.o. Aluiiiiiilura, but also

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BATH ORIGINAL

other metals such as silicon, sltan or yanad ^ in into consideration. By using such desoxldlerender Active ingredients will the poran increases during the singing, so that "at normal sintering temperatures of 1150 to 1200 ° and with the usual sizing times of 30 to 45 Minutes at least the same effect is achieved, like bein: Langzedtsintörn, which under Use of much higher esra temperatures, however, carried out without special pore-forming additives will.

The invention is described and explained in more detail below with reference to the diagram shown in the drawing. In this diagram * of the sintered alloy of the elastic moduli E is above the specific weight S applied "welch® improvement ₀ verifiable © rgibt _s \ / © nn the usual Sintereisenpulvar as deeo ^ idierender material aluminum wirdο mixed As edged got a soaked thick line area recognize one can _see the elastic modulus increases with its Höcl? .ßtv / Erten

"G -

BATH ORIGINAL

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from 15 500 kp / mm ² for J ^{6.4 g / cm 2} to about 17 000 kp / nm 2 at about J ^ 6.8 g / cm. while the achieved minimum values of 14,200 kp / iam at 6.54 g / onr up to 16,500 kp / mm ² for J> «6.8 g / am ⁵ . In comparison with this, the relationships are shown with a thin line 2, as they are established for sintered iron alloys having approximately the same specific weight of 6.5 g / cm3 if no additives according to the invention are used. It clearly shows that through. the use of aluminum powder a considerable increase in the modulus of elasticity is achieved.

Between the two surfaces 1 and 2, a field 5 is delimited by a thick, broken line, which applies to the Pail that the sintered iron alloy according to the invention magnesium is mixed in powder form. The minimum values of the modulus of elasticity E _{0 achieved here} are significantly higher than the maximum values that can be achieved in sintered plants without the addition of area 2.

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Between the two surfaces 1 and 3 is the in the drawing with the dotted line 4 delimited field that when using titanium as an additional, deoxidizing agent. From the examples shown in the diagram it is clear that aluminum and titanium have the greatest modulus of elasticity of sintered iron increase and that magnesium follows.

Below is a table summarized as with specific weight kept constant - 6.5 ε / cnr the notch coefficient m decrease and how the modulus of elasticity can be increased proportionally compared to a sintered iron processed without the additives according to the invention

Alloy with relative elasticity

Sintered iron without

Additions 2.50 ... 2.80 1

Sintered iron + 0.1 £ Mg 2.00 ... 2.50 1.15 *

= 6.5 g / cnr ^p sintered iron + 0.5 % Ti 1.90 ..... 2 * 10 1.21 < sintered iron + 0.5 % Al 1.70 ... 1.90 1.3 J

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155865A

While in the above 'described embodiments the porenformenda active ingredient as a pure metal powder which is also powdery in its initial state! Sintered iron alloy was supplied, Such an addition can also be made in the form of an alloy Powder, for example as an alloy with others, which have no pore-forming effect Metals, such as manganese, copper, nickel aa.

In the tests then evaluated in the Sa'bolXe above, a sintered fiber "MH 100.24" was used, p which 0.02 # C = remainder »Pe

contains. Di «* according to the invention Measures, the addition of oxidizing probes »Substances can also be all the usual unalloyed and

alloyed

S int er e i e egg powderrai sohuiigen angsv / ende t vrer dsn.

However, it is also true that this «po;? & Nfornenden substances in Ρολ-η of fJaJ.zon and other inorganic or organic yerblndußen in clie Sintereioenpi ~ lvenaiöchiii.ig etn.! S \ xhzingQn. In the event of a pre-vention of the invention, pore-forming substances are introduced into the mold

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Solution brought with which the out of the usual Sintered iron powder mixtures - but without the addition of the active ingredients according to the invention - pressed Moldings are soaked before the sintering process. The subsequent addition of the pore-forming substances can also take place in the vaporous state · This is easy to achieve, especially with magnesium. For this purpose, the effective® substance can be put into the sintering furnace together with the pressed shapes. brought and there τ®2? is steamed. But it is It is also possible to vaporize the active substance outside the sintering furnace and then the steam. the sintering atmosphere © in the sintering furnace.

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Claims (9)

Expectations 1. Sintered iron alloy for the production of sintered bra Form «j share which are subjected to a heat treatment at about 1100 to 1250 ⁰ C, characterized in that they contain a strongly deoxidizing active ingredient in an amount of 0.001 £ to 1 ^. 2. sintered iron alloy according to claim 1, characterized in that the active ingredient made of aluminum » Zinc, titanium, manganese. , Vanadium, silicon or boron. 3. sintered iron alloy according to claim 1, characterized in that the active ingredient consists of one Alkaline earth metal, in particular magnesium, calcium or beryllium, or an alkali metal. 4. sintered iron alloy according to one of the claims 1 to 3, characterized in that the active ingredient in powder form is also in powder form before => lying sintered iron is added. - 2 009830/0384 155865Λ 5. Sintereleenalloy according to claim 4 _f, characterized in that the powdery admixed active ingredient consists of an alloy of at least two of the substances mentioned in claims 2 and 3 or of an alloy of the active ingredient with a non-porous metal. 6. Inter-iron alloy according to claim 1, characterized characterized in that the YJirkstoff in the form of a powdered chemical compound is. · ?. Process for the production of a sintered iron Alloy according to Claim 1, characterized in that the active ingredient is brought into the form of a solution and that with this solution the molded articles pressed from the sintered iron powder soaked and only then subjected to the heat treatment will. 8. Method according to claim? _r characterized in that the active ingredient is pressed into the finished product during the heat treatment. ? oralinge is introduced. ORiGIiNIAL BATHROOM 009830/0384 9. The method according to claim. 8, characterized « iaß the active ingredient is introduced in vapor form into the oven provided for heat treatment. 10. The method according to claim 8, characterized in that that the active ingredient is evaporated in the oven provided for heat treatment. 009830/0384