Unoziva here nickel-chromium carbide?

(Inowanzonzi NiCr-Cr₃C₂ composite poda) ndeyepamusoro-inoshanda cermet zvinhu zvakagadzirirwa kukwirisa-tembiricha, corrosive, uye kusapfeka-kupfeka nharaunda. Iyo ine nickel-chromium alloy (NiCr) binder chikamu uye chromium carbide (Cr₃C₂) yakaoma chikamu. Kuumbwa kwayo kwakajairika ndeye 75% Cr₃C₂ + 25% NiCr (apo NiCr iri 80% Ni uye 20% Cr). Coatings inogadzirwa ne high-velocity oxygen fuel (HVOF) kana plasma spraying inoita basa rakakosha mukuchengetedza zvakakosha maindasitiri.

I. Kuumbwa Kwezvinhu uye Maumbirwo

Duplex Composite Dhizaini:

Yakaoma Phase Cr₃C₂: Iine nzvimbo yakanyunguduka yakakwira se1810 ° C, yakanakisa-yepamusoro-yekushisa kuomarara (microhardness 2200-2700 kg/mm²), uye yakasimba oxidation kuramba (yakakosha oxidation inongotanga pa1100-1400 ° C). NiCr binder chikamu: Inopa kuomarara uye kusagadzikana kwemarara. Iyo 80% Ni-20% Cr alloy kuumbwa inoumba dense oxide firimu pakupisa kwakanyanya, inosimudzira ngura uye oxidation kuramba.
Powder Form: Yakagadzirwa kuburikidza neagglomeration uye sintering maitiro, hupfu hunowanzo ine particle size ye15-45 μm (yeHVOF) kana -325 mesh (yekupfapfaidza plasma). Chengetedza kure nehunyoro uye woomesa pa 120 ° C kweawa imwe usati washandisa.

II. Core Performance Advantages
1. Kunyanya Kugadzikana Kwepamusoro Kwekushisa
- Oxidation kuramba inosvika 900 ° C. Mushure mekuratidzwa kune 982 ° C kwemaawa mashanu, inongoratidzira kushoma kwemavara, nepo WC-Co alloys kana simbi isina tsvina inowana yakanyanya oxidation kutadza.
-Kuchengeta kuomarara kwakanyanya pakupisa kwakanyanya kunoita kuti ive yakakodzera kumidziyo yekupisa senge gasi turbines uye boilers.

2. Yakanakisa Corrosion Resistance
- Munzvimbo dzakacheneswa sulfuric acid, kushora kwayo kusimba kakapetwa makumi matatu kune ye1Cr18Ni9Ti simbi isina tsvina; mumhepo inopfungaira, kushora kwayo kakapetwa makumi mashanu iyo yeCo-WC alloys.
- Inodzivirira kune alkaline solution corrosion, yakakodzera kugadzira mapepa uye michina yemakemikari.

3. Kupfeka Kwepamusoro uye Kuramba Kwekukurwa
- Mushure mekupfapfaidza pamagetsi emagetsi boiler chubhu madziro, kupfeka kwegore kunoderedzwa kubva pa1.5-2.0 mm kusvika 0.03 mm, kuwedzera hupenyu hwebasa kusvika anopfuura makore manomwe.
- Yakanakisa kupikisa kukukurwa nejecha-yakaremerwa mvura inoyerera, yakakodzera kune turbine blades uye marine pombi zvikamu.

4. Optimized Friction Performance (Self-Lubricating Variant)
- Kuwedzera Ni-coated MoS₂ (8-24%) inogadzira iyo yekuzvizora, inoderedza friction coefficient kubva 0.72 kusvika 0.45 uye kuderedza kupera kwehuremu ne36%.

III. Industrial Applications
1. Simba uye Simba Equipment
Boiler "Four-Tube" Dziviriro: Mvura-madziro machubhu, superheaters, nezvimwewo, inodzivirirwa kubva mukukukurwa kwemadota emarasha, ichiwedzera hupenyu hwavo hwesevhisi kanomwe, kuderedza kuputika kwechubhu.
Gas Turbines uye Hydropower: Anti-cavitation coatings pa blade seals uye kutungamira vanes, inopikisa 800 ° C high-temperature gasi.

2. Petrochemicals uye Heavy Machinery

Zvishandiso zvekuchera: Makora ekudhiraivha nemadhaka epombi anodzivirira kukukurwa kwegrit uye kupera simba kweasidhi.

Mavharuvhu nemaCompressors: Nzvimbo dzekuisa chisimbiso uye screw surface dzinosimbiswa kuti dzitsive midziyo yesimbi isina simbi inodhura.

3. Papermaking uye Textile Machinery

Drying Cylinder Roller Surfaces: Kuoma kunosvika HRC 35-46, kuderedza scraper kupfeka uye kuwedzera kutenderera kubva pamwedzi mitanhatu kusvika kumakore 3-4.

Gondola Rollers: Inopikisa fiber friction uye inowedzera kutsiva.

4. Aerospace uye High-End Equipment

Engine Seal Runways: Compressor brush seals inoratidzira simba rebhondi re43–47.6 MPa uye zvigadziriso zvega.

Kudzika Gear Pins: Ramba kushushikana kupfeka uye kumirisana neyakakura-mutoro zvinokanganisa.

IV. Mapoinzi Akakosha Pakupfapfaidza
1. Upfu Kuenderana
- Kune HVOF, -325 mesh poda yakatsetseka (particle size 15-45 μm) inosarudzwa; kupfapfaidza kweplasma, -150/300 mesh inosarudzwa.
- Hygroscopic powders inoda preheating pa 120 ° C kweawa imwe chete kudzivirira porosity mukuputira.

2. Parameter Optimization
HVOF maitiro: Kumhanya kwemoto 1500-2000 m/s, tembiricha 2800–3100°C, kudzvanyirira Cr₃C₂ decomposition (decomposition rate - Yakajairika parameters: Oxygen pressure 0.9 MPa, propane pressure 0.4 MPa, spray distance 180–380 mm.

3. Substrate Pretreatment
- Sandblast kusvika kuSa3 giredhi, ine roughness ye50-80 μm. Kupfapfaidza kunofanira kupedzwa mukati memaawa 3-4 ejecha.

V. Innovation Directions uye Maitiro
Kuzvinyudza maComposites: Kuwedzera mafuta akasimba akadai seNi-coated MoS₂/BaF₂ kunoderedza coefficient of friction (semuenzaniso, muzvisimbiso zvemuchadenga).
Nano-kusimudzira: Kuunza B₄C kana nano-Cr₃C₂ (0.8-2 μm) inovandudza coating density uye kuoma.
Intelligent Processing: Chaiyo-nguva yekutarisa tembiricha yemurazvo uye particle velocity inoderedza coating porosity (chinangwa:

Summary
Nickel-chromium carbide coatings, kuburikidza nekudyidzana kwavo dhizaini ye "Cr₃C₂ yakaoma chikamu + NiCr binder chikamu," ndiyo mhinduro yakanakira kugadzirisa kutadza katatu kwekushisa kwakanyanya, ngura, uye kupfeka. Kushandiswa kwavo kwakasimbiswa musimba, kubhururuka nendege, uye indasitiri inorema yakaratidza kukosha kwavo kwekudzivirira kwenguva refu. Kubudirira kweramangwana kunotarisisa kune akawanda anoshanda macomposites uye nemazvo kugadzirisa kuti urambe uchikunda mabhodhoro mukudzivirira pasi pemamiriro ekushanda akanyanya.