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Erosion-corrosion resistant nitride cermets

A cermet, nitride technology, applied in the field of cermet

Inactive Publication Date: 2006-06-21
EXXON RES & ENG CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The life of prior art refractory linings is significantly limited by excessive mechanical wear of the lining due to high velocity solid particle impact, mechanical fracture and chipping

Method used

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  • Erosion-corrosion resistant nitride cermets
  • Erosion-corrosion resistant nitride cermets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 70vol% of 2-5μm average diameter TiN powder (99.8% purity, obtained from Alfa AeSaR) and 30vol% of 6.7μm average diameter 304SS powder (OSPRey metal, 95.9% sieve-16μm) were dispersed in low-pressure polyethylene with ethanol in a grinding container. The powder in ethanol was mixed with yttria-toughened zirconia pellets (YZT) (10 mm diameter, obtained from Tosoh Ceramics) in a ball mill at 100 rpm for 24 hours. Ethanol was removed from the mixed powder by heating at 130° C. in a vacuum oven for 24 hours. The dry powder was compacted in a 40 mm diameter die in a hydraulic coaxial press (SPEX 3630 Automated X-press) at a pressure of 5,000 psi. The resulting green disc was ramped at 25°C / min to 400°C under argon and held for 30 minutes to remove residual solvent. The wafer was then heated to 1500°C at 15°C / min in argon and held at 1500°C for 2 hours. Then the temperature was reduced to below 100°C at -15°C / min.

[0037] The resulting cermet contains:

[0038] i) 69 vol...

Embodiment 2

[0042] As described in Example 1, 70 vol% of CrN powder (99.8% purity, obtained from AlfaAesar, 99% sieve 325 mesh) and 30 vol% of 304SS powder with an average diameter of 6.7 μm (Osprey metal, 95.9% sieve -16 μm) for processing the cermet disc. The cermet disc was then heated to 1450°C at 15°C / min in argon and held at 1450°C for 2 hours. Then the temperature was reduced to below 100°C at -15°C / min.

[0043] The resulting cermet contains:

[0044] i) 20 vol% CrN with an average particle size of about 25 μm

[0045] ii) 50 vol% of the second nitride M having an average particle size of about 1 μm 2 N, where M = Cr, Fe, Ni

[0046] iii) 30vol% Cr-poor alloy binder.

[0047] figure 2 is a scanning electron microscope image of a CrN cermet processed according to this example, where the scale bar represents 50 μm. In this image, the CrN phase appears dark and the binder phase appears light. The Cr-rich second M 2 The N phase is likewise shown in the binder phase.

Embodiment 3

[0049] Each of the cermets of Examples 1 and 2 was subjected to the Thermal Abrasion and Abrasion Test (HEAT). The steps used are as follows:

[0050] 1) Weigh a cermet disc sample with a diameter of about 35 mm and a thickness of about 5 mm.

[0051] 2) The center of one side of the wafer is then subjected to 1200 g / min of SiC particles (220 abrasive, #1 grade black corundum, UK grinding) entrained in hot air leaving a 0.5 inch diameter tube at an angle of 45 degrees agent, Northbrook, IL) treatment was terminated at 1 inch from the target. The speed of SiC is 45.7 m / s.

[0052] 3) Step (2) was carried out at 732° C. for 7 hours.

[0053] 4) After 7 hours, the samples were cooled to ambient temperature and weighed to determine weight loss.

[0054] 5) Determine the wear of a commercially available castable alumina refractory sample for use as a reference standard. The reference standard wear was given a value of 1 and the results are listed in Table 1 for the cermet samp...

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Abstract

The present invention includes a cermet composition represented by the general formula (PQ) (RS), including a ceramic phase (PQ) and a bonding phase (RS), wherein P is selected from Si, Mn, Fe, Ti, Zr, Hf , V, Nb, Ta, Cr, Mo, W and their mixtures, Q is a nitride, R is a metal selected from Fe, Ni, Co, Mn and their mixtures, S is basically composed of at least one selected from Cr , Al, Si and Y, and at least one reactive wetting variable valence element selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W and mixtures thereof.

Description

field of invention [0001] The present invention relates generally to cermets, and more particularly to cermet compositions comprising metal nitrides. These cermets are suitable for high temperature applications requiring excellent resistance to wear and corrosive substances. Background of the invention [0002] Abrasion resistant substances are used in many applications where surfaces are subject to abrasive forces. For example, refinery process vessel walls and internal structures exposed to corrosive fluids containing hard solid particles, such as catalyst particles, are susceptible to abrasion and corrosion in a variety of chemical and petroleum environments. Protecting these wear- and corrosion-resistant pipes and internal structures, especially at high temperatures, is a technical challenge. Refractory linings are currently used for components that require the most severe wear and corrosion protection, such as the inner walls of inner cyclones for the separation of so...

Claims

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Application Information

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IPC IPC(8): C22C29/00
Inventor 金昌旻纳拉辛哈-拉奥·文卡塔·邦加如陈炫佑具滋荣约翰·罗格·彼得森罗伯特·利·安特拉姆克里斯托夫·约翰·弗劳尔
Owner EXXON RES & ENG CO
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