US4772346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bonding inorganic particulate material
Assignee: International Business Machines Corp
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Filing: 1987-10-29
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Granted: 1988-09-20
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Expires: 2007-10-29
Abstract
Abstract In a process for forming elements from a slurry that includes particulate ceramic and/or glass, an organic binder resin, and a solvent for the resin, where the element is shaped from the slurry, and the element heated to remove the organic materials of the slurry and subsequently fuse the ceramic and/or glass particles, the improvement comprised of coating the ceramic and/or glass particles prior to forming the slurry with a surface modification compound selected from the group consisting of organo silanes, organo silazanes, titanium chelates, titanium esters, and mixtures thereof.
Inventors
- 👤 Herbert R. Anderson, Jr.
- 👤 Constance J. Araps
- 👤 Renuka S. Divakaruni
- 👤 Daniel P. Kirby
- 👤 Robert W. Nufer
- 👤 Harbans S. Sachdev
- 👤 Krishna G. Sachdev
- 👤 Darbha Suryanarayana
- 👤 Stoyan M. Zalar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:42
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/6268; C03; C03C; C03C10/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C04B35/628; C04B35/62802; C04B35/62805; C04B35/62807; C04B35/63; C04B35/6303; C04B35/6316; C04B35/632; C04B35/6325; C04B35/634; C04B35/63404; C04B35/6342; C04B35/638; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H10; H10W; H10W99/00; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3231; C04B2235/3232; C04B2235/34; C04B2235/3427; C04B2235/3463; C04B2235/3481; C04B2235/44; C04B2235/449; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/60; C04B2235/602; C04B2235/6025; C04B2235/65; C04B2235/656; C04B2235/6562; C04B2235/658; C04B2235/6582; C04B2235/6583; C04B2235/6584; C04B2235/6588; C04B2235/70; C04B2235/96; C04B2235/9646; C04B2235/9661
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
166 words
An improved method for manufacturing self-bonded elements from particulate ceramic and glass materials comprising forming a finely divided compound that includes particles of ceramic materials, coating the particles of said finely divided compound with a heat decomposable surface modification monomeric organo compound selected from the group consisting of organo silanes, organo silazanes, titanium chelates, titanium esters, and mixtures thereof, combining and mixing the coated particles of finely divided compound with an organic resin binder and solvent for the binder to form a slurry, shaping the slurry to form the desired element, heating the element to remove the binder, the solvent, and subsequently the coating, during said heating, the coating acting to seal or neutralize the active molecular sites on the particles, which would otherwise react with the organic binder and solvent materials in the slurry to form deliterious carbonaceous material, until at least the major portion of the organic binder and solvent materials are consumed, continuing the heating to fuse the particles of finely divided compound.
Claim 2
Dependent Claim
166 words
An improved method for manufacturing self-bonded elements from particulate ceramic and glass materials comprising forming a finely divided compound that includes particles of ceramic materials, coating the particles of said finely divided compound with a heat decomposable surface modification monomeric organo compound selected from the group consisting of organo silanes, organo silazanes, titanium chelates, titanium esters, and mixtures thereof, combining and mixing the coated particles of finely divided compound with an organic resin binder and solvent for the binder to form a slurry, shaping the slurry to form the desired element, heating the element to remove the binder, the solvent, and subsequently the coating, during said heating, the coating acting to seal or neutralize the active molecular sites on the particles, which would otherwise react with the organic binder and solvent materials in the slurry to form deliterious carbonaceous material, until at least the major portion of the organic binder and solvent materials are consumed, continuing the heating to fuse the particles of finely divided compound.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said organo silazane compound is selected from the group consisting of octamethyl cyclo tetrasilazane, hexamethyl disilazane, and mixtures thereof.
Claim 4
Dependent Claim
58 words
The method of claim 1 wherein said titanium chelates has the structure ##STR4## where X is a carbonyl group of a ketone, aldehyde, ester, or amino group, Y is a 2 or 3 carbon atom chain, and R" is a 3 to 5 carbon atom unit joined with an oxygen atom through a secondary or tertiary carbon atom.
Claim 5
Dependent Claim
36 words
The method of claim 3 wherein said titanium chelate is selected from the group consisting of titanium acetyl acetonate, titanium ethanalomine chelate, titanium lactic acid chelate, octylene glycol titanate, titanium ethyl acety acetate, and mixtures thereof.
Claim 6
Dependent Claim
33 words
The method of claim 1 wherein said titanate ester compound is selected from the group consisting of isopropyl tri (dioctyl pyrophosphate) titanate, titanium di(dioctyl pyrophosphate) oxyacetate, di(dioctyl pyrophosphate) ethylene titanate, and mixtures thereof.
Claim 7
Dependent Claim
20 words
The method of claim 5 wherein said modification compound constitutes 0.1 to 2% by weight of said finely divided compound.
Claim 8
Dependent Claim
13 words
The method of claim 1 wherein said surface modification compound is hexamethyl disilazane.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein said finely divided compound is a glass-ceramic material.
Claim 10
Dependent Claim
51 words
The method of claim 1 wherein adventitious surface carbonaceous residue is removed from said finely divided particles of ceramic material prior to coating of the particles with said surface modification compounds by heating said material at a temperature not less than 600° C. for a time sufficient to oxidize the residue.
Claim 11
Dependent Claim
20 words
The method of claim 9 wherein the heating phase of residue removal is done in a wet oxygen gas flow.
Claim 12
Dependent Claim
56 words
The method of claim 1 wherein said particles of finely divided particles of ceramic material are coated with said surface modification compound by dissolving said modification compound in a solvent for the compound, immersing the finely divided particles of ceramic in the dissolved modification compound, and removing and drying the finely divided particles of ceramic material.
Claim 13
Dependent Claim
26 words
The process of claim 1 wherein said slurry is doctor bladed and dried to form ceramic green sheets, and the sheets laminated to form a substrate.
Claim 14
Dependent Claim
40 words
The process of claim 12 wherein said ceramic green sheets are punched to form via holes, a conductive metal paste deposited in the via holes and on the sheets to form metallurgy lines, and the resultant sheets assembled and laminated.
Claim 15
Dependent Claim
14 words
The method of claim 13 wherein said finely divided compound is a glass-ceramic material.
Claim 16
Dependent Claim
18 words
The method of claim 14 wherein said conductive metal paste contains copper as the major electrically conductive constituent.
Claim 17
Dependent Claim
71 words
The method of claim 15 wherein the laminated substrate is heated to a temperature of the order of 750° C.in a neutral ambient, the substrate heated in a H 2 /H 2 O ambient for a time of the order of 4 hours, and temperature subsequently increased to a temperature on the order of 960° C. in an N 2 ambient and held for a time not less than 2 hours.
Claim 18
Dependent Claim
28 words
The method of claim 1 wherein said particulate glass and ceramic materials are cleaned to remove all carbonaceous residue material before being coated with said surface modification compound.
Claim 19
Dependent Claim
30 words
The method of claim 17 wherein said cleaning of said particulate glass and ceramic materials is achieved by heating in air to a temperature on the order of 600° C.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |