High Temperature Amorphous Composition Based on Aluminum Phosphate

a technology of aluminum phosphate and composition, which is applied in the direction of anti-corrosion paints, metallic material coating processes, inorganic chemistry, etc., can solve the problems of unsuitable high-temperature ceramic materials, no known synthetic oxides which can remain amorphous and metastable at temperatures up to 1400° c. or greater, and aluminum phosphate is unsuitable for high-temperature ceramic materials. achieve the effect of enhancing the resulting amorphous

Inactive Publication Date:
View PDF18 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The present invention relates generally to substantially amorphous aluminum phosphate materials and / or compositions exhibiting metastability and various other related properties under high temperature conditions. In part, metastability can be evidenced by retention of amorphous characteristics under oxidizing conditions, such morphology and the extent thereof due at least in part to the aluminum content of such materials / compositions, with those having an overall stoichiometric excess of aluminum exhibiting enhanced amorphous character and associated stability as compared to their stoichiometric counterparts. Such properties and related high-temperature attributes can be effected in the preparation of such materials / compositions, primarily by admixture of the aluminum precursor to the corresponding phosphate precursor to initiate various structural and / or compositional modifications which manifest themselves in the high temperature performance of the resulting aluminum phosphate material / composition. In particular, and as illustrated more clearly in the following examples, aluminum can be identified upon addition to a phosphate precursor and shown as contributing to the amorphous character and associated metastability of the resulting aluminum phosphate material / composition. Addition of a stoichiometric excess of aluminum precursor enhances the resulting amorphous character and metastability.

Problems solved by technology

Up to the present time, however, there are no known synthetic oxides which can remain amorphous and metastable at temperatures up to 1400° C. or greater.
Aluminum phosphate, however, is unsuitable for use as a high temperature ceramic material because it undergoes polymorphic transformations (quartz-type, tridymite and cristobalite) with corresponding large molar volume changes.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • High Temperature Amorphous Composition Based on Aluminum Phosphate
  • High Temperature Amorphous Composition Based on Aluminum Phosphate
  • High Temperature Amorphous Composition Based on Aluminum Phosphate

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0054]To make 850 mL of 75.46 g / L a precursor solution to synthesize the amorphous aluminum phosphate material with a 1.75:1 Al:P ratio (0.375 molar excess Al2O3), 408.94 g Al(NO3)39H2O was dissolved in 382 ml ethanol to make 500 ml of solution. In a separate container in an inert atmosphere, 25.23 g P2O5 was dissolved in 300 ml ethanol. After the P2O5 is dissolved, the two solutions were mixed together and allowed to stir for several minutes. After the solution was thoroughly mixed, it was placed in a large container in an oven at 150° C. for one or more hours. After the resulting powder is completely dried, it was annealed in air to 1100° C. for one hour to form amorphous aluminum phosphate powder with 0.75 moles excess aluminum per mole aluminum phosphate.

example 2

[0055]To form an oxidation resistant amorphous aluminum phosphate coating on a rectangular coupon of 304 stainless steel, the piece was dipped in the precursor solution of Example 1, diluted to a certain concentration and removed. The sample was dried in flowing air to remove the solvent. The sample was dried more thoroughly in an oven at 65° C. The piece was annealed in air to 1000° C. (at a ramp rate of 10 C / minute) for 100 hours and cooled to room temperature at 10 C / minute, along with an uncoated piece of 304 stainless steel of the same size and shape. The weight of each uncoated piece was measured prior to anneal. The weight was measured again after coating and anneal. The amorphous aluminum phosphate coated piece showed remarkably less weight gain. The weight gain data is given in the table below.

TABLE IWeight gain of uncoated, and coated (AlPO4, with 75% excess Al) stain-less steel coupons annealed to 1000° C. in air. The weight gain isrelated to the weight of the annealed, u...

example 3

[0056]To form an amorphous aluminum phosphate coating on a solid substrate by plasma spray, amorphous aluminum phosphate powder made in Example 1 is milled to a small and uniform size (around 20 microns) in a ball mill. The powder is then deposited using the small particle plasma spray process (see, U.S. Pat. No. 5,744,777 incorporated herein by reference in its entirety).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
temperaturesaaaaaaaaaa
temperaturesaaaaaaaaaa
temperatureaaaaaaaaaa
Login to view more

Abstract

A composition providing thermal, corrosion, and oxidation protection at high temperatures is based on a synthetic aluminum phosphate, in which the molar content of aluminum is greater than phosphorus. The composition is annealed and is metastable at temperatures up to 1400° C.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of and claims priority benefit from application Ser. No. 10 / 362,869 filed Jul. 15, 2003, which in turn claims priority from U.S. national application filed under 35 U.S.C. § 371 of international application no. PCT / US01 / 41790 filed on Aug. 20, 2001, which is a continuation-in-part of and claims priority benefit from application Ser. No. 09 / 644,495 filed Aug. 23, 2000, now issued as U.S. Pat. No. 6,461,415, each of which is incorporated herein by reference in its entirety.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH[0002]The United States government has certain rights to this invention pursuant to Air Force Office of Scientific Research contract no. F49620-00-C-0022 and Department of Energy contract no. DOE DE-AC05-84OR21400-1DX-SY067V, both with Applied Thin Films, Inc.BACKGROUND OF THE INVENTION[0003]This invention relates to synthetic inorganic compositions which remain metastable and possess other...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(United States)
IPC IPC(8): B05D3/00C01B25/36C09D5/08C03C3/17C03C10/00C03C17/02C04B33/14C04B35/447C04B35/628C04B41/45C09D1/00C09D7/12C23C2/04C23C4/10C23C4/12C23C22/74C23C30/00
CPCC04B2235/44C04B2235/402C04B2235/5436C04B2235/721C04B2235/77C04B2235/9607C08K3/22C08K3/32C08K7/04C09D7/1216C23C2/04C23C4/105C23C4/127C23C22/74C23C30/00C04B2235/5228C04B2235/3418C04B2235/3232C04B2235/3227C04B2235/3224C04B2235/3217C04B41/4584C04B41/009C04B35/63488C01B25/36C03C3/17C03C10/00C03C17/02C04B33/14C04B33/30C04B33/36C04B35/447C04B35/62268C04B35/62655C04B35/62873C04B35/62881C04B35/6303C04B41/4535C04B41/5048C04B41/5092C04B14/4625C04B14/4656C23C4/11C23C4/134C09D7/48
Inventor SAMBASIVAN, SANKARSTEINER, KIMBERLY A.
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap