13.10/2023
POLEMA presented at the“BIOTECHMED” its innovative medical products
11.07/2023
POLEMA at INNOPROM in Ekaterinburg
Ni and Fe - based heat-resistant alloys for coatings
VKNA, RP-NiCr16Al6Y, AP-Cr20Ni80, RP-Cr20Ni80, RP-NiCr20Co20Al13, RP-FeCr20Al6Y and others. Me (Fe, Ni, Co)-Cr-Al alloys provide heat-resistant coatings for gas turbine engines and energy equipment. Reduced and water-sprayed powders may be used to produce parts for use in construction using the sintering method.
RP-Ni85Al15 gas-thermal and flame-resistant coatings, durable in water and coating alkali, and as substrata for coatings made from oxides and carbides.
RP-Ni70Al30 flame-resistant and heat-resistant coatings at temperatures of up to 1200 0C, for use in construction parts produced through sintering.
RP-Ni55Ti45 -wear-resistant coatings durable in alkali, seawater and open air at temperatures of up to 600 0C, in construction parts with shape-memory effects produced through sintering.
Methods for coating deposition:plasma spraying, plasma-jet hard-facing (PTA), plasma-flame, detonation and high-speed spraying (HVOF).
Choice of material is based on the purpose of coating, the aim of acheiving special properties in the surface of machine and equipment parts, and the method of coating deposition.
|
Powder grade |
Nominal chemical composition, % | ||||||
| Basic components and admixtures | |||||||
| Fe | Cr | Ni | Co | Mo | Al | Other | |
|
AP-NiAl5 gas-sprayed, spheroidal
-40, 11-53, 40-100, 40-125, 45-106
|
<1.0 | - | base | - | - | 5 | С <0,1, Si, Fe, Mn <1 |
|
AP-Cr20Ni80 (Nitrogen atomization) gas-sprayed, spheroidal AP-Cr20Ni80 (Water atomization) water-sprayed, round -40, 20-63, 40-100, 80-160 microns |
<1.0 | 20.5 | base | - | - | - |
C, Mn <0.1 each Si <0.5 O<0.05 |
|
RP-Cr20Ni80 reduced, irregular fr. -40, 40-100, 40-160 microns |
<0.3 | 20 | base | - | - | - | C <0.06 S <0.01 Si<0.1 O<0.3 |
|
RP-FeCr25Al6 reduced, irregular -45, -63, -280 microns |
base | 25 | -- | -- | -- | 6 | C <0.2 each |
|
RP-FeCr20Al6Y reduced, irregular -45, -63, -280 microns |
base | 20 | - | - | - | 6 |
C <0.2 Y |
|
RP-FeCr25Al10 reduced, irregular -45, -63, -280 microns |
base | 25 | - | - | - | 10 | C <0.2 |
|
RP-Ni70Al30 reduced, irregular 20-63 microns |
<0.2 | - | base | - | - | 30.5 | C <0.07 |
|
RP-Ni85Al15 reduced, irregular 20-63, 40-100 microns |
<0.2 | - | base | - | - | 15 | C <0.07 |
|
RP-Ni55Ti45 reduced, irregular 20-63, 40-100 microns |
<0.2 | - | base | - | - | - |
Ti 45 C <0.07 |
| RP-Ni75Al23W (VKNA) reduced, irregular -56 microns | <0.2 | + | base | + | + |
23 |
chem. comp. by request |
|
RP-NiCr20Al10 reduced, irregular -45, -63, -280 microns |
- | 20 | base | - | - |
10 |
C <0.2 |
|
RP-NiCr16Al6Y reduced, irregular -45, -63, -280 microns |
- | 16 | base | - | - |
6 |
Y 0.5 Ca, C <0.2 each |
|
RP-NiCr20Co20Al13 reduced, irregular -40,-63, 40-100 microns |
<0.3 | 20 | base | 20 | - |
13 |
Y Si Nb C 0.01-0.15 |
|
AP-NiCr22Al10Y * gas-sprayed, spheroidal (analog Amdry 962 / NiCrAlY 66 22 10 1) |
- | 21,00-23,00 | base | - | - | 9,00-11,00 |
Y 0,80-1,20 S+P+Si+Mn max 1,00 % |
|
AP-CrNi67Al12* gas-sprayed, spheroidal (analog Amperit 457.642) |
- | 19,00-21,00 | base | - | - | 11,00-12,00 |
Y 0,20-0,50 Re 0,70-0,90 Hf 0,70-0,90 |
|
RP-NiCr20Si reduced, irregular -40,-63, 40-100 microns |
- | 20 | base | - | - |
- |
Si 2 |
*New materials: Ni-Cr-Al-Y system alloys for coatings application in aerospace industry.
Alloys of the Ni-Cr-Al-Y system are most widely used to obtain coatings on blades operating at high temperatures and thermal stresses.
Sprayed powders may be delivered with other particle size not presented in the table, in microns: 45-125, -125, 100-140, 100-280, 160-280, 280-400.
Properties of NiAl metallides
The basic phase in the material RP-Ni70Al30 is the metallide NiAl (β` - phase >95%), while in RP-Ni85Al15 it is the metallide Ni3Al (γ`- phase >95%), and in VKNA the metallide Ni3Al (γ`- phase). The materials' structure in a coating is marked by high resistance to recrystallization during use at high temperatures.
Particle shape
RP-Ni85Al15
VKNA
Particle size
Base fraction 20-63 microns, VKNA powder 56 microns.
The typical average size (conditional diameter) of powder particles is 30-40 microns
Physical-mechanical properties of powders and coatings
VKNA is a heat-resistant super-alloy based on the metallide Ni3Al, phase-strengthened with admixtures of infusible metals, which is characterized by outstanding physical and mechanical properties of plasma coatings: structural thermal stability, heat-resistance and wear-resistance when used as parts in gas-turbine engines at temperatures of 1150-1200 0C.
RP-Ni70Al30
Smelting temperature 1640 0C. Exclusively high heat-resistance when heated in open air, more than three times greater resistance to corrosion than the common heat-resistant alloy CrNi77TiAlB.
| Material |
C over a period of 100 hrs |
||
| 1000 | 1100 | 1200 | |
|
RP-Ni70Al30 |
0.06 | 0.1 | 0.2 |
|
CrNi77TiAlB (NiCr20Ti2,5Al) |
0.14 | 0.36 | 0.65 |
RP-Ni70Al30 in plasma coatings is corrosion-resistant in the atmosphere, water and in alkalis (NaOH and KOH solutions).
Surface hardness is approximately 40 HRC; the material forms durable coatings with steel and copper and is well pressed and sintered in a vacuum
RP-Ni85Al15
Melting point is 1400 0C; excellent heat-resistance of coatings when heated in open air to 1150 0C; the material and coatings are durable in the atmosphere, water and alkalis.
Hardness of plasma coatings is approximately 300 HB; the material forms durable coatings with steel and copper.
