Reaction sintering

Lee, V. J. Parravano, G. (1959). Sintering reactions on zinc oxide. Journal of Applied Physics, 30, 1735-40. 

Dry 1/f-tetrazole (0.131 g, 1.875 mmol) was added to a suspension of Tyr-peptide-Wang-resin 44 (0.075 mmol) and (tBuO)2PNEt2 (0.187 g, 0.750 mmol) in anhyd DMF (0.5 mL) and the sintered reaction vessel rotated for 3 h under N2. The soln was removed under positive N2 pressure, the resin washed with CH2C12 (3 x 3mL) and treated with TFA/Et3SiH/PhOMe (95 2.5 2.5, 2mF) for 2h. The soln was collected, the solvent removed under reduced pressure and the peptide precipitated by the addition of Et20 (10 mL). The peptide was purified by RP-HPLC [0.1 M TEA (adjusted to pH 7.5 with AcOH), 0-40% MeCN over 40min, flow rate 2.0mL-min ] and gave the product as a white powder yield 41% MALDI-MS m/z 1992.5 [M + H],... 

SRBSN sintered reaction bonded Si3N4 ceramics ... 

The lignite type ashes have comparatively low fouling propensity when the sodium content is below 4 per cent because of the limited amount of clay minerals available for sintering reaction. That is, in some lignite and sub-bituminous coals there is an excess of sodium and calcium available for the high temperature reactions, and the rate of deposit formation depends on the silicate content of ash (2,29). The bituminous coal type ash has an excess of silicates, i.e. the ash is pyrochemically acidic and the rate of sintering depends on the availability of sodium, calcium and iron species in the flame heated deposit material. 

Hackley, V.A. et al.. Aqueous processing of sintered reaction-bonded silicon nitride I. Dispersion properties of silicon powder, 7. Am. Ceram. Soc., 80, 1781, 1997. 

Figure 1 shows the x-ray diffraction patterns of the FGM measured at several depths. The aluminium titanate (P-AliTiOs) in the sample is believed to form through the sintering reaction... 

X.W. Zhu, Y. Zhou, and K. Hirao, Effect of Sintering Additive Composition on the Processing and Thermal Conductivity of Sintered Reaction-Bonded SijN4,7. Am. Ceram. Soc., 87, 1398-400(2004). 

The range of applications for RBSN and sintered reaction-bonded silicon nitride has shrunk over the last few years. This is connected with the decreasing cost of silicon nitride powders, reducing the production costs of SSN and the lower strength and lifetime of RBSN in comparison to SSN in many applications. For this reason, these materials will not be explained in detail in this work reference is made to special reviews [6, 7]. The following paragraphs concentrate on dense silicon nitride materials made from silicon nitride powders. 

Figure 56. X-ray analysis of sintering reactions during hot pressing of B4C-Si-B-TiC-WC-Co blends. Holding time at the particular temperature step 1 min.

Table 14. Sintering reactions of ternary boride cermets.

An initial experiment using a 70-mm inside diameter stainless steel pipe as a reaction vessel was carried out in order to observe the change in the permeability of die bed caused by the progress of the sintering reaction. 

The experiments were conducted on a vertical rotary surface grinder with a 5.5 kW motor spindle. The feed can be continuously adjusted within a range. The workpieces were made from intered sintered reaction-bonded silicon nitride (SRBSN) and cast-and-sintered silicon nitride (Si3N4). The grain size was between 0.3 and 0.4 pm for SRBSN and between 0.6 and 0.8 pm for SiaN4. Cast-iron fiber-bonded diamond wheels of 200 mm diameter were used. A Noritake AFG-M grinding fluid at a rate of 20-30 L/min was used as electrolytic fluid. 

Titanium silicon carbide MAX phase was synthesized by pressureless sintering of ball milled TiC and Si powders of six different compositions. The sintering reactions were evaluated in situ by dilatometer analysis under flowing argon gas. The as-sintered samples were evaluated using mainly x-ray diffraction (XRD) analysis. This study showed that titanium carbide, silicon carbide and titanium disilicide were present as intermediate or secondary phases in the samples. 

As the sample holders and the crucibles used in this study were made of graphite, carbon was readily available during the sintering reactions. All samples with excess silicon had comparable and relatively low amounts of TiSij. Previous results have shown that the silicide is an intermediate phase to MAX phase formation lixim these powders. TiSi2 is then likely consumed in a second, TijSiCj forming reaction ... 

This chapter will first describe the different types of solid state reactions (the sintering reactions in ceramics processing, e.g., are solid state reactions in materials technology ) and the typical reaction rates that are observed. Then the mechanisms for these reactions or, more precisely, the diffusion mechanisms and how they are studied will be discussed. 

Will the presence of oxygen in the gas phase increase or decrease the rate of the sintering reaction ZnO + CrjOj ZnCr04 ... 

Figure 16.13 Relationship between thermal conductivity and four-point bending strength of various types of high-thermal conductivity Si3N4 fabricated by different routes. GPSN = gas-pressure-sintered silicon nitride SRBSN = sintered reaction-bonded silicon nitride [62].

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