SU732402A1 - Ferrous sintered material - Google Patents

Description

(54) SINTERED MATERIAL BASED ON IRON

I

The invention relates to powder metallurgy, in particular, sintered iron-based materials used in the manufacture of parts operating under conditions of medium and high loads.

Known sintered iron-based material containing nickel, copper, carbon, chromium. The disadvantage of this material is its low mechanical strength.

The closest to the invention in terms of technical essence and effect achieved is a sintered iron-based material having the following composition, weight. %:

Nickel. 0.25-1.0

Copper0,15-2,25

Molybdenum 0.1-0.6

Bor0-0,2

O-0,1 carbon

Manganese AO, 3

Silicon OH, 3

Iron Else 2

The disadvantage of the known material is not sufficiently high mechanical strength.

The purpose of the invention is to increase the mechanical strength of the material.

For this purpose, a sintered iron-based material has been proposed, which differs from the known material in that it contains components in the following ratio, wt%:

ten

Nickel2.5-3, O

Copper2, O-2.5

. Molybdenum 0.8-1.0

Manganese, 1-O, 5

Silicon0, O5-0.5

15

Carbon0.02 -O, 1

IronErest

In order to improve the combination of mechanical strength and toughness, the nickel content in the material in

20 1.2-1.4 times more than copper and 3 times warmer than molybdenum.

The compositions of the known and proposed materials are given in table.1. , k) Well-known material. The boundary mangan content in the iron material is produced by powder metallurgy. A mixture consisting of iron powder of the grades PZh4M2, PZhZM2 (GOST 9849-74), nickel powder of the grades PNKOT2, PNK2T2, copper powder of the grades PMS-1, PMS-2 (GOST 4960-75), molybdenum powder (MRU 48- 16-3-66) and 1% of water stearate (to improve compressibility). The resulting mixture is pressed at a pressure of 6-8 ton / cm, is sintered at a temperature of 115 ° -1200 ° C for two hours

Table 1 . emi and carbon are due to shke. in the atmosphere of dissociated ammonia, subjected to dynamic hot pressing at a temperature of 1OOOOO C (induction heating) to a density of 7.4-7.6 g / cm and additional heat treatment (quenching from 1OOO C in water and aging at 500 C for 1 h ). Comparative data on the properties of the known and proposed materials are given in Table 2. table 2

5,7324О26

As follows from the data. Nickel 2 5-3 O

Sintered iron-based material. Copper 2 O-2 5

the proposed composition has more Molybdenum 08-10

viewpoint of mechanical strength for srav-manganese O 1-O 5

with a famous material.s silicon a.OS-o.S

Claims (2)

The invention claims Carbon 0, O2-O, 1 Sintered material based on Jelly-Iron Else for, containing nickel, copper, molybdenum ,. Information sources, manganese, silicon and carbon, which is taken into account in the examination complying with the fact that, for the purpose of 1. USSR Author's Certificate, higher mechanical strength, 449-971, Cl, C 22 C 33/02, 1972. contains the components in the following 2. Patent of France Mb 2230440, but more1 C 22 C 39/36, 1974 (prototype).