CN104550671A - Method for preparing novel boron nitride based composite coating - Google Patents
Method for preparing novel boron nitride based composite coating Download PDFInfo
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- CN104550671A CN104550671A CN201310493219.5A CN201310493219A CN104550671A CN 104550671 A CN104550671 A CN 104550671A CN 201310493219 A CN201310493219 A CN 201310493219A CN 104550671 A CN104550671 A CN 104550671A
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- boron nitride
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- hot pressed
- composite coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Products (AREA)
Abstract
The invention discloses a method for preparing a novel boron nitride based composite coating. According to the method, a pretreatment process which can both reduce the cost and effectively improve the flowability of boron nitride powder in a solvent is adopted as a coating preparation process, so that ordinary boron nitride can be possibly used as a forming material of a titanium alloy fired mold fine cast mold shell. The coating is good in coating and coating suspending property, can well cover fine surfaces of wetted molten molds, is appropriate in velocity and relatively good in leveling property, can be uniformly distributed on a module without piling, is good in power and accumulation stability, can be well suspended and dispersed without being blocked, is relatively long in service life and is prevented from being rapidly aged and invalid.
Description
Technical field
The invention belongs to casting technology field, be specifically related to a kind of compound method of novel boron nitride-base composite coating.
Background technology
Investment pattern precision casting is a kind of traditional casting technique, and this casting method mainly comprises wax pattern preparation, Shell Preparation and cast three parts.For the investment pattern precision casting technological process of titanium alloy, the main difference of the fine casting method of it and other alloys, is its shell and Shell Preparation technique thereof.The selection of shell Modeling Material (refractory material, binding agent) is wherein then the key problem that first this titanium investment precision casting technology flow process of formation must solve.The various boron nitride sold in the market comprise the various boron nitride powder Performance Characteristics such as t-BN, high-purity boron nitride to have carried out investigating comparing, find that these boron nitride exist the problems such as specific area is large, poor fluidity, cost intensive, the Modeling Material of precision investment casting mould case cannot be used for.
Summary of the invention
In order to overcome the above-mentioned technical problem that prior art field exists, the object of the invention is to, provide a kind of compound method of novel boron nitride-base composite coating, coating has good covering and being coated with property, can cover well and fine surface on wetting fusible pattern; There are suitable viscosity and good levelability, evenly can spread on module, not produce accumulation; Good power and aggregation stability, can suspend well and disperse, not form agglomerate; There is the longer life-span, unlikely too fast ageing failure.
The compound method of novel boron nitride-base composite coating provided by the invention, comprises the following steps:
1. the pretreatment of pair raw material: in the enterprise producing boron nitride prod, have the leftover bits produced during a large amount of processing hot pressed boron products.These hot pressed sintering boron nitride leftover bits, through ball milling can become we need through the pretreated powder of hot pressed sintering.And these pretreated boron nitride particles are sieved to the hexagonal boron nitride obtaining particle mean size > 30 μm.
2. prepare coating: will through process ground boron nitride powder and yttrium oxide powder, (75% boron nitride, 25% yittrium oxide) mixes by a certain percentage, puts into yttrium colloidal sol, and adds in a small amount of additive (JFC type surfactant, octanol) and be mixed with coating.
The compound method of novel boron nitride-base composite coating provided by the invention, its beneficial effect is,
1. the stable chemical property of boron nitride, is also convenient to preparation and the preservation of investment precoat.Boron nitride does not react with cold water and ethanolic solution, acid, alkali.Therefore can coordinate with many binding agents and chemical reaction not occur, will, as easy gel containing yittrium oxide coating, make the preservation of coating relatively easy containing boron nitride coating.
2. in the titanium alloy precision casting such as density ratio zirconia, yittrium oxide of boron nitride, the density of conventional oxide little a lot (being approximately 1/3 ~ 1/2 of the oxide such as zirconia, yittrium oxide), is only 1/9 of tungsten powder density.Make the shell of the same number of plies (isometric(al)), significantly can reduce the preparation cost of shell.
3. boron nitride is widely used by industrial, is easy to obtain, and non-toxic and non-radioactive, to human body without ill-effect
Detailed description of the invention
Below in conjunction with an embodiment, the compound method of novel boron nitride-base composite coating provided by the invention is described in detail.
Embodiment
The compound method of the novel boron nitride-base composite coating of the present embodiment, comprises the following steps:
1) to the pretreatment of raw material: in the enterprise producing boron nitride prod, have the leftover bits produced during a large amount of processing hot pressed boron products.These hot pressed sintering boron nitride leftover bits, through ball milling can become we need through the pretreated powder of hot pressed sintering.And these pretreated boron nitride particles are sieved to the hexagonal boron nitride obtaining particle mean size > 30 μm.
2) coating is prepared: will through process ground boron nitride powder and yttrium oxide powder, (75% boron nitride by a certain percentage, 25% yittrium oxide) mixing, put into yttrium colloidal sol, and add in a small amount of additive (JFC type surfactant, octanol) and be mixed with coating.
Claims (1)
1. a compound method for novel boron nitride-base composite coating, is characterized in that: said method comprising the steps of:
(1) to the pretreatment of raw material: in the enterprise producing boron nitride prod, there are the leftover bits produced during a large amount of processing hot pressed boron products, these hot pressed sintering boron nitride leftover bits, through ball milling can become that we need through the pretreated powder of hot pressed sintering, and these pretreated boron nitride particles are sieved to the hexagonal boron nitride obtaining particle mean size > 30 μm;
(2) prepare coating: will through process ground boron nitride powder and yttrium oxide powder, by 75% boron nitride, 25% yittrium oxide ratio mixes, and puts into yttrium colloidal sol, and adds in a small amount of JFC type surfactant, octanol and be mixed with coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310493219.5A CN104550671A (en) | 2013-10-21 | 2013-10-21 | Method for preparing novel boron nitride based composite coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310493219.5A CN104550671A (en) | 2013-10-21 | 2013-10-21 | Method for preparing novel boron nitride based composite coating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104550671A true CN104550671A (en) | 2015-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310493219.5A Pending CN104550671A (en) | 2013-10-21 | 2013-10-21 | Method for preparing novel boron nitride based composite coating |
Country Status (1)
| Country | Link |
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| CN (1) | CN104550671A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107309388A (en) * | 2017-08-12 | 2017-11-03 | 合肥市田源精铸有限公司 | A kind of precision-investment casting composite coating |
| CN107414017A (en) * | 2017-08-12 | 2017-12-01 | 合肥市田源精铸有限公司 | A kind of titanium alloy fine casting composite shell |
-
2013
- 2013-10-21 CN CN201310493219.5A patent/CN104550671A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107309388A (en) * | 2017-08-12 | 2017-11-03 | 合肥市田源精铸有限公司 | A kind of precision-investment casting composite coating |
| CN107414017A (en) * | 2017-08-12 | 2017-12-01 | 合肥市田源精铸有限公司 | A kind of titanium alloy fine casting composite shell |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150429 |