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Advanced erosion-corrosion resistant boride cermets

A kind of cermet, boride technology, applied in the field of cermet

Inactive Publication Date: 2006-10-11
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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  • Advanced erosion-corrosion resistant boride cermets
  • Advanced erosion-corrosion resistant boride cermets
  • Advanced erosion-corrosion resistant boride cermets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 70 vol% of 14.0 μm average diameter TiB2 powder (99.5% purity, obtained from Alfa Aesar, 99% sieved below -325 mesh) and 30 vol% of 6.7 μm average diameter 304SS powder (Osprey Metals, 95.9% sieved below -16 μm) was dispersed with ethanol in a low-pressure polyethylene milling vessel. The powder in ethanol was mixed with yttria-toughened zirconia pellets (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.

[0052] The resulting cermet...

Embodiment 2

[0056] As described in Example 1, 75 vol% TiB with an average diameter of 14.0 μm 2 Powder (99.5% pure, obtained from Alfa Aesar, 99% screened below -325 mesh) and 25 vol% of 304SS powder (Osprey metal, 95.9 screened below -16 μm) with an average diameter of 6.7 μm) were used to process the metal Ceramic discs. The wafer was then heated to 1700°C at 15°C / min in argon and held at 1700°C for 30 min hrs. Then the temperature was reduced to below 100°C at -15°C / min.

[0057] The resulting cermet contains:

[0058] i) 74 vol% of TiB with an average particle size of 7 μm 2 ,

[0059] ii) 3 vol% of the second boride M with an average particle size of 2 μm 2 B

[0060] iii) 23 vol% Cr-poor alloy binder.

[0061] figure 2 is TiB processed according to this example 2 SEM images of cermets, where the scale bar represents 10um. In this image, TiB 2 The phase appeared to be dark in color and the binder phase appeared to be light in color. Cr-rich M 2 A second boride phase of ...

Embodiment 3

[0063] As described in Example 1, 70vol% of TiB with an average diameter of 14.0um 2 Powder (99.5% purity, obtained from Alfa Aesar, 99% screened below -325 mesh) and 30 vol% of 6.7 μm average diameter 304SS powder (Osprey metal, 95.9% screened below -16 μm) were used to process the metal ceramics. The cermet disc was then heated to 1500°C in argon and held for 2 hours. Then the temperature was reduced to below 100°C at -15°C / min. Hot isostatic pressing of pre-sintered discs in argon at 12°C / min to 1600°C and 30 kpsi (206MPa) and hold at 1600°C and 30kpsi (206MPa) for 1 hour . It was then cooled down to 1200°C at 5°C / min and held at 1200°C for 4 hours. Then the temperature is reduced to below 100°C at -30°C / min.

[0064] The resulting cermet contains:

[0065] i) 69 vol% of TiB with an average particle size of 7 μm 2 ,

[0066] ii) 4 vol% of the second boride M with an average particle size of 2 μm 2 B, wherein M=55Cr: 42Fe: 3Ti (wt%],

[0067] iii) 27vol% Cr-poor al...

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Abstract

A cermet composition represented by the formula (PQ)(RS) comprising: a ceramic phase (PQ) and binder phase (RS) wherein, P is at least one metal selected from the group consisting of Group IV, Group V, Group VI elements, Q is boride, R is selected from the group consisting of Fe, Ni, Co, Mn and mixtures thereof, S comprises at least one element selected from Cr, Al, Si and Y.

Description

field of invention [0001] The present invention relates generally to cermets, and more particularly to cermet compositions comprising metal borides. 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 sol...

Claims

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Application Information

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IPC IPC(8): C22C1/05
Inventor 纳拉辛哈－拉奥·文卡塔·班加鲁全昌旻尼拉杰·斯里尼瓦斯·蒂鲁玛莱陈炫佑约翰·罗杰·彼得森罗伯特·李·安特拉姆克里斯多佛·约翰·福勒具滋荣
Owner EXXON RES & ENG CO
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