The Author Outlined The Composite Ceramicss Process Gists, linear Temperature Region of ℃ of Gained High Quality PTC Thermal Sensitize Ceramics With 2 % Linear Error And 100.
By The Way The Experiment Results Have Been Discussed.
of Resistance Temperature Characteristic of of Composition Technology of of Composite Thermal Sensitized Cerarnics of Keywords normally PTC is hot quick material, its resistor, temperature character shows logarithm model nonlinear change. This kind nonlinear character is made to its measure lukewarm component to bring inconvenience, become especially with the computer or connection of digital type appearance when, must make linearization handle ability to use above all. This makes circuit complications not only, can reduce at the same time detect precision, limitation measures lukewarm range. Accordingly, be necessary hunting has linear resistance, the heat of temperature character quick material. Polyphase and compound the actual micromechanism that is pair of material has pilot a kind of very effective method. To heat quick pottery and porcelain, use compound technology to be able to improve its resistor, temperature feature, widen linear lukewarm area. In recent years, to losing temperature coefficient (NTC) is hot quick of material compound, have document story, but did not see PTC compound reports. We use the technology of compound pottery and porcelain, different almsgiver impure PTC pottery and porcelain undertakes compound, obtained clear positive result, get degree of linearity is 2% , the high-powered pottery and porcelain that width of linear lukewarm area is 100 ℃ is sensitive material. The article discussed mix into Sb (Ba, the BaTiO3 of Sr)TiO3 and mix into Nb is compound into PTC the compound craft of heat quick pottery and porcelain, undertook discussion to experimental result. 1 experiment and craft raw material choose BaCO3(99.
0%) , srCO3(99.
79%) , tiO2(99%) , nb2O5(99.
5%) , sb2O3(99.
The reagent such as 0%) . photograph of B of A get along with compound, among them A photograph advocate material is (Ba1 - XSrx)(Ti1.
005 - YSby)O3, b photograph advocate material is Ba(Ti1.
In 005-ZNbz)O3 experiment process, individual choice differs 5 kinds of constituent compound, its name and compound deserve to be expressed than rank 1. Sample preparation presses general ceramics technological process, if pursue,1 is shown. Adopt two kinds of complex plan, make compound the different level that appears in technological process. Those who express 1 compound pottery and porcelain is compound deserve to be compared than matching (Ⅱ of complex plan of Ⅰ of complex plan of A ∶ B) 1 ∶ 1S - 1S ′ - 11 ∶ 2S - 2S ′ - 22 ∶ 1S - 3S ′ - 31 ∶ 0S - 4S ′ - 40 ∶ 1S - 5S, be in pre-burning temperature surely be less than 1150 ℃ , firing temperature is in surely be less than 1350 ℃ most appropriate. As a result of firing it is preparation PTC it is the most important to guide partly segment in porcelain craft, it is deciding the micromechanism of material, because this is in firing level constant temperature was used to reach in the process drop in temperature quickly wait for measure, to avoiding grain excrescent the action that reachs resistor of control room temperature to lead Dou Youming to show. (Mixture of A)BaCO3 ＋ TiO2 (2 poor heat analyse the graph of the analysis that differ heat of the curve of the analysis that differ heat of mixture of B)SrCO3 ＋ TiO2 the sample of pottery and porcelain that 2 results will make the curve undertakes block lukewarm character checks, the result is shown at the graph 3 with the graph 4. Graph 3 what make to press complex plan Ⅰ is different and compound the curve of block lukewarm character that deserves to compare, graph 4 what make to press complex plan Ⅱ is different and compound the curve of block lukewarm character that deserves to compare. By the least square method, can beg a S respectively, 3, S, 1, S ′ , the working curve of lukewarm character of 3 sample block is respectively: LgR=0.
0285t - 0.
0238t - 0.
0416t - 1.
0039 (3) pursues graph of 3 block lukewarm character curve of 4 block lukewarm character is compared to facilitate, differ below will same complex plan compound the S that deserves to compare, 3, S, the working curve of 1 sample is shown at the graph 5, and different and complex plan is identical and complex the S that deserves to compare, 3, S ′ , the working curve of 3 sample is shown pursue at issueing a page 6. And S, 3, S, 1, S ′ , the LgR test value of 3 sample and the computational value that give by working curve computation are made quite, rank is expressed 2, watch 3 with the watch 4. Graph 5 S, 3, S, the working curve of 1 expresses 2 S, estimation of test of lukewarm area of linear of degree of linearity of LgR of ℃ of T/ of lukewarm area of the degree of linearity of 3 sample, linear calculates value deviation 401.
08932%100 ℃ 902.
0767 graphs 6 S, 3, S ′ , the working curve of 3 expresses 3 S, estimation of test of lukewarm area of linear of degree of linearity of LgR of ℃ of T/ of lukewarm area of the degree of linearity of 1 sample, linear calculates value deviation 601.
06253%70 ℃ 1001.
0365 watches ′ of 4 S, estimation of test of lukewarm area of linear of degree of linearity of 1gR of ℃ of T/ of lukewarm area of the degree of linearity of 3 sample, linear calculates value deviation 702.
12295%60 ℃ 1003.
15413 analysises and the character that discussion follows temperature to change by the electrical conductivity of two-phase of A, B reach special compound technology, can think compound pottery and porcelain roughly to be equivalent to two-phase stringing together, shunt-wound model, if pursue,7 are shown. Accordingly, to compound heat quick pottery and porcelain has: (A) series model (B) shunt-wound model pursues the ρ of A of υ of ＝ of imitate model ρ of 7 compound pottery and porcelain of of B of ρ of B/ of υ of ＋ of A of ρ of A/ of υ of ＝ of ρ of B1/ of ρ of B of A ＋ υ (4) among them ρ A, ρ B is A, B respectively two kinds, ρ is the resistor rate of composite material, b of υ A, υ is A, B the bulk mark with two kinds of single-phase respective material. Formula of general experience is: of of of In of ρ of I of ρ N= υ (the N in 5) type is constant, when N → 0 when, because of ρ N=1+nlg ρ , have of of I of ρ of Ilg of υ of Lg ρ = (6) calls logarithm mixture rule.  the ρ as a result of PTC pottery and porcelain - T concerns (inside the constant temperature limits in temperature of prep above Courier) for  : of of of Ioexp(AiT) of ρ of ρ I ＝ (I of the ρ in 7) type is led for normal temperature resistor, ai is material constant. Criterion will (7) type takes the place of (6) type gets compound heat quick the ρ of pottery and porcelain - T concerns: Lg ρ ＝ (＋ of Io of υ Ilg ρ ( of υ IAilge)t (ρ of ＝ of Io of ρ of Ilg of 8) your υ 0, υ IAilge ＝ A, criterion ( of of AT of ＋ of O of ρ of ＝ of ρ of Lg of of 8) type melt into (O of the ρ in 9) type, A all is constant. Visible, in temperature of prep above Courier certain inside lukewarm area, compound heat quick the ρ of pottery and porcelain - T relation shows logarithm line sexual relationship. Craft and theory make clear: The PTC electron pottery and porcelain that nods different Courier mixes equably, the resistor of body of the porcelain after mixing is led, not only the electrical conductivity with body of every kinds of porcelain is relevant, and distributing with each groups of content of the portion relevant. Adjust each groups of content of the portion, repass is nonlinear agglomeration, high temperature quenchs wait for craft, restrain a bound to weigh combustion process, height of base of power of abate pottery and porcelain concerns to the dependence of temperature, the block lukewarm concern that causes compound pottery and porcelain is stricter inside one lukewarm area of Duan Jiaokuan ground logarithm linearization. With S - 3 for exemple, if the graph is shown 5 times, when two-phase of A, B with 2 ∶ of 1 deserve to compare compound when, it is inside the limits of 100 ℃ lukewarm area of 140 ℃ of 40 ～ , its block lukewarm relation is LgR ＝ 0.
02285t - 0.
0193, show linear concern, degree of linearity is 2% . And adopt different and same complex plan, compound deserve to compare (1 ∶ of ＝ of A ∶ B the S of 1) - 1 sample, if the graph is shown 5 times, its block lukewarm relation is in the 70 ℃ of 130 ℃ of 60 ～ show linear concern inside lukewarm area limits, degree of linearity is 3% . Apparent, below same complex plan, compound the impact of block lukewarm character that matchs more compound than be opposite pottery and porcelain is bigger, the group share that can carry two-phase of change A, B gets differring the linearization effect of lukewarm area. Craft still makes clear: When compound deserve to compare identical when, different complex program is bigger to compound effect impact. With S - 3 for exemple, if the graph is shown 6 times, its are compound deserve to compare all be ＝ of A ∶ B 2 ∶ 1, but S - 3 adopt complex plan Ⅰ (the 1) that be like a graph, compound effect is better; And S - 3 adopt complex plan Ⅱ (the 1) that be like a graph, degree of linearity is 5% , linear lukewarm area is 60 ℃ , compound effect is poor. Explain different in technological process level has each look compound, compound to its effect has bigger effect. 4 conclusion 4.
When 1 complex plan is same, compound the impact of block lukewarm character that matchs more compound than be opposite pottery and porcelain is bigger. 4.
Different in technological process level has 2 each looks compound, compound to its effect has bigger effect. 4.
3 mix into Sb (Ba, the BaTiO3 of Sr)TiO3 and mix into Nb with 2 ∶ 1 compound, can obtain degree of linearity for 2% , linear lukewarm area is 100 ℃ temperature coefficient is hot quick pottery and porcelain. CNC Milling