densification of alkoxide-derived fine silica powder

US7235118B2

A method and product derived therefrom for consolidating nanoparticles to form particles in a micrometric size distribution. The method preserves the nanoparticles with the resultant micrometric particles. The primary processing operation is milling. US7235118B2 US10/414,316 US41431603A US7235118B2 US 7235118 B2 US7235118 B2 US 7235118B2 US 41431603 A US41431603 A US 41431603A US

US7235118B2

A method and product derived therefrom for consolidating nanoparticles to form particles in a micrometric size distribution. The method preserves the nanoparticles with the resultant micrometric particles. The primary processing operation is milling. US7235118B2 US10/414,316 US41431603A US7235118B2 US 7235118 B2 US7235118 B2 US 7235118B2 US 41431603 A US41431603 A US 41431603A US

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Control of the texture of gel

model [89-91]. However, the densification of alkoxide-derived gels cannot be described on the basis of viscous sintering alone. The metastable nature of alkoxide-derived gels dramatically influences both the densification kinetics and thermodynamics. It is not

Aluminosilicates compacts by alkoxide route: influence of

Abstract The sol-gel route was employed to obtain three different powders with the stoichiometric composition corresponding to mullite (3 Al 2 O 3.2SiO 2): (i) commercial alumina and silica from sol-gel, (ii) alumina and silica by alkoxide partial hydrolysis, (iii) alumina and silica by alkoxide simultaneous hydrolysis.. Tetraethylorthosilicate (TEOS) and aluminium tri-sec-butoxide were used

Materials

The ceramic powders proposed in this study α-Al 2 O 3 alumina, designation TM-DAR, from Tamei Chemicals (Tokyo, Japan), and ZrO 2 stabilised with 3% mol Y 2 O 3 from Tosoh Co. (Tokyo, Japan), designation TZ-PX-245. According to the manufacturer's data, Al 2 O 3 powder had an average particle size of d 50 = 100 nm, while TZ3 powder's average particle size of d 50 = 40 nm.

Control of the texture of gel

model [89-91]. However, the densification of alkoxide-derived gels cannot be described on the basis of viscous sintering alone. The metastable nature of alkoxide-derived gels dramatically influences both the densification kinetics and thermodynamics. It is not

Cold sintering: Current status and prospects

II. CSP BACKGROUND We define CSP as the process where an inorganic powder is densified in the presence of a transient liquid phase at a phase fraction typically between 1 and 10 vol%. Reference Guo, Guo, Baker, Lanagan, Kupp, Messing and Randall 12– Reference Induja and Sebastian 28 During cold sintering, the liquid phase becomes the medium for mass transport.

Creep deformation behavior during densification of ZrB –SiBCN

of fused silica in a relatively low temperature range, its deformation and movement under pressure may be easier than those of crystal ceramic powder [15–17]. Therefore, SiBCN as a sintering aid may also contribute to promoting matter transportation of ZrB2

THE PRODUCTION AND OPTICAL INVESTIGATION OF ION

The processing steps involved in making sol-gel-derived silica materials by methods 1 to 3 as stated in section 1.3 are compared below. A schematic illustration of these steps is given in figure 2.1. At step 4 in the process the product of method 1, dried

US7235118B2

A method and product derived therefrom for consolidating nanoparticles to form particles in a micrometric size distribution. The method preserves the nanoparticles with the resultant micrometric particles. The primary processing operation is milling. US7235118B2 US10/414,316 US41431603A US7235118B2 US 7235118 B2 US7235118 B2 US 7235118B2 US 41431603 A US41431603 A US 41431603A US

(PDF) Synthesis of sol

British Ceramic Transactions 1999 Vol. 98 No. 2 Sathiyakumar and Gnanam Synthesis of sol–gel derived alumina powder It is possible that a alumina crystals formed during the calcination of boehmite acted as seeds in the sintering process resulting in high densities and fine microstructure.

Ferroelectric Glass

An overview of ferroelectric glass ceramics, some literature review and some of the important previous studies were focused in this chapter. Nanocrystalline glass–ceramics containing ferroelectric perovskite-structured phases have been included. All modified glasses having ferroelectric ceramics which prepared by different methods are discussed, that producing nanocrystalline glass

Structural investigation of cobalt oxide seeded silica

This work reports the hydrothermal treatment effect on cobalt silica-seeded xerogels under harsh conditions at 550 C for 100 h in a humid gas stream containing 25 mol% H2O(v). A series of two seeded xerogels were prepared by two distinct methods, namely, xerogel seeding (XG) and sol–gel seeding (SG). Post-hydrothermal structural analysis showed type I sorption isotherms for both seeded

INCAIFIED iininhhhhhinhhil PROESS ING TECHNIQSUES I

Fumed silica powder with particles ranging from 10-40 nm in diameter. is produced by a flame hydrolysis method (e.g., avoided these problems by calcining fragments of alkoxide derived gels and then hot pressing the gel-fiagments to achieve full density (Ref2

Microstructural Elements of Components Derived From 3D Printing

less sensitive to powder type. Low skeletal density corresponds to high silica content, as discussed above. Thus, the alumina content of the primitives increases in order, spray dried, solid spherical, 325 mesh, 30 micron. 4.00 3.50-g 3.00 . j2.50~ 2.00 1.50 C skeletal density

transportation of silica to processing plant

Silica Fume using undensified silica fume and some additional processing steps. The majority of densification silos have a very fine screen that covers the bottom section upon which the silica fume rests. Air is blown into the silo under the screen.

Mullite Powder

2021/5/4Find Mullite Powder related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Mullite Powder information. FORREST Technical Coatings Powder Coatings Powder Coatings. Our Powder technical department includes three chemists who bring over 50 years experience in powder coatings. coatings.

Silica nanowires synthesized from gas by

The derived alkoxide gel powder was used the source for both SiC powder and silica NWs. The NWs were deposited on both graphite substrates and p-type (100) silicon wafers in order to investigate the wide-area deposition aspect of the silica structures in the

Aluminosilicates compacts by alkoxide route: influence of

Abstract The sol-gel route was employed to obtain three different powders with the stoichiometric composition corresponding to mullite (3 Al 2 O 3.2SiO 2): (i) commercial alumina and silica from sol-gel, (ii) alumina and silica by alkoxide partial hydrolysis, (iii) alumina and silica by alkoxide simultaneous hydrolysis.. Tetraethylorthosilicate (TEOS) and aluminium tri-sec-butoxide were used

Silica fume

Silica fume, also known as microsilica, (CAS number 69012-64-2, EINECS number 273-761-1) is an amorphous (non-crystalline) polymorph of silicon dioxide, silica.It is an ultrafine powder collected as a by-product of the silicon and ferrosilicon alloy production and consists of spherical particles with an average particle diameter of 150 nm.

Titania

1989/3/1Microstructure- and crystallite-free titania- silica glass containing up to 8.5 wt% titania was produced by sintering the alkoxide derived powder. The powders were also processed through more traditional shape-forming operations such as dry pressing and tape casting, thereby providing evi- dence of the excellent potential of this powder to produce shaped titania-silica glass articles.

Dependence Properties of Sol

Various concentrations of copper oxide were embedded into silica matrix of xerogel forms using copper source Cu(NOsub3/sub)sub2/sub#x000B7;3Hsub2/subO. The xerogel samples were prepared by hydrolysis and condensation of tetraethyl orthosilicate (TEOS) with determination of new molar ratios of the components by the sol-gel method. In this paper, three samples of copper oxide

BJNANO

A quantitative understanding of aggregation mechanisms leading to the formation of composites of inorganic nanoparticles (NPs) and proteins in aqueous media is of paramount interest for colloid chemistry. In particular, the interactions between silica (SiO 2) NPs and lysozyme (LZM) have attracted attention, because LZM is well-known to adsorb strongly to silica NPs, while at the same time

Control of the texture of gel

model [89-91]. However, the densification of alkoxide-derived gels cannot be described on the basis of viscous sintering alone. The metastable nature of alkoxide-derived gels dramatically influences both the densification kinetics and thermodynamics. It is not

Densification and crystallization behaviour of colloidal cordierite

Moreover, gel-derived compacts often show the commencement of crystallization be-fore complete densification, leaving large pores unremoved. This problem is most fre - quently encountered in the densification of multicomponent silica-containing gels that

Effect of Calcium Precursor on the Bioactivity and

2.1. Materials Characterisation All dried glass samples presented as fine, white, free-flowing powders that were used without further modification or reduction in particle-size. Powder XRD patterns of the pure silica Stber glass particles (viz.Stber) and those

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